Abstract
This article examines the development, interpretation, and practical application of evidentiary standards in Bosnia and Herzegovina within comparative, doctrinal, and supranational contexts. It begins by situating the Bosnian model within the broader distinction between common law and continental traditions: the Anglo-American formula of proof beyond a reasonable doubt, designed for communication with lay juries, and the continental notion of certainty (certitudo), rooted in rationalist legal culture and professional adjudication. While these two standards are functionally equivalent in requiring exclusion of rational doubt, their conceptual emphases and historical trajectories differ. The article then analyzes the traditional tripartite structure of Bosnian criminal procedure – certainty, probability, and doubt – and demonstrates that the standard of certainty has long performed the same role as beyond reasonable doubt. The growing use of the latter phrase in Bosnian jurisprudence is therefore interpreted not as a doctrinal transformation but as a shift in nomenclature, reflecting comparative influences and harmonization with international human rights law. Special attention is given to the case law of the European Court of Human Rights, whose jurisprudence binds domestic courts under Article II/2. of the Constitution of Bosnia and Herzegovina. By employing its own “beyond reasonable doubt” standard and emphasizing reasoned judgments, the Court shapes the domestic articulation and justification of evidentiary thresholds. The article concludes that Bosnia and Herzegovina illustrates both continuity and adaptation: while retaining its continental doctrinal foundations, it increasingly rearticulates evidentiary standards in a vocabulary aligned with European and comparative practice.
Keywords
Introduction
The determination of evidentiary standards constitutes one of the central questions of criminal procedure, as it directly shapes the balance between effective prosecution and the protection of the accused against wrongful conviction. Standards of proof serve as normative thresholds that guide the evaluation of evidence, delineating the degree of conviction required for judicial decision-making at various stages of proceedings. Their articulation differs across legal traditions: common law systems formulate explicit categories such as preponderance of the evidence or beyond a reasonable doubt, while continental systems historically rely on the principle of free judicial evaluation, expressed through concepts such as certainty (certitudo) or intime conviction.
Although functionally convergent, these traditions have developed distinctive conceptual vocabularies and institutional practices. The common law's insistence on instructing lay juries necessitated clear verbal formulations, whereas the continental model, grounded in professional adjudication, emphasized the rational persuasion of trained judges. In recent decades, however, jurisprudence of the European Court of Human Rights and comparative influences have prompted a gradual cross-pollination, leading continental systems – including Bosnia and Herzegovina – to increasingly invoke the “beyond a reasonable doubt” formula alongside the traditional requirement of certainty.
This article examines the theoretical, comparative, and practical dimensions of evidentiary standards with special reference to Bosnia and Herzegovina. It traces the historical roots and conceptual divergences of certainty and beyond a reasonable doubt, situates them within broader comparative developments, and analyzes whether the apparent shift in Bosnian judicial discourse represents a substantive transformation of evidentiary thresholds or merely a change in nomenclature aligned with international practice.
General considerations on evidentiary standards
The evidentiary standard – or the quantum of evidence necessary for a fact to be regarded as proven – can be understood as the threshold of quantity and quality of evidence required to satisfy the burden of proof. In other words, it represents the degree of certainty that must be achieved for a decision-making body to treat a fact as legally established (Mrčela and Delost, 2019: 418). This degree may vary along a spectrum ranging from mere probability to full conviction.
In criminal proceedings, evidentiary standards are primarily interpreted and applied by the adjudicating authorities responsible for fact-finding. While other participants in the process, such as expert witnesses, may also contribute to the establishment of facts, the final determination of legally decisive facts remains within the exclusive competence of the criminal justice bodies.
As Bayer (1980: 14–15) has observed, all possible modes of ascertaining facts in criminal proceedings can be grouped into two fundamental categories: first, the decision-making body's own direct observations, and second, all other forms of fact-finding mediated through evidence, or means of proof. The first category – direct perception by the court or other procedural authority – constitutes the most reliable mode of establishing facts. Unlike mediated forms of evidence, direct observation creates the shortest possible cognitive chain between perception and reality: through sensory apperception of an object, person, or event, the adjudicator immediately attains conviction as to its existence or non-existence. By contrast, when facts are established through other means of evidence, a layer of “intermediaries” is introduced between the adjudicator's consciousness and the fact in question. These intermediaries – whether testimony, documents, or expert conclusions – must be critically assessed for credibility and reliability. As Krapac (2015: 433) emphasizes, this mediation inevitably increases the possibility of cognitive error in the process of proof. For this reason, evidentiary standards are indispensable: they serve as normative safeguards to guide the adjudicator in distinguishing between varying levels of probability and ensuring that factual determinations are reached with the requisite degree of certainty.
When the criminal procedural authority establishes a fact through either of the two aforementioned methods – direct observation or mediated evidence – we speak of an immediately established legally decisive fact. Yet not all legally relevant facts can be proven in such a direct manner. In many instances, legally decisive facts are established indirectly, on the basis of one or more facts that, while not legally decisive in themselves, possess cognitive significance. By applying the rules of logic and general human experience, these subsidiary facts allow the adjudicator to infer the existence of the legally relevant fact in question (Krapac, 2015: 435). In the theory of criminal procedural law, such subsidiary facts are termed indications (indicia). In practice, they function as signposts, guiding the adjudicator toward the establishment of a legally decisive fact.
The concept of the standard of proof is thus closely intertwined with both the subjective and objective conceptions of the burden of proof. The subjective dimension relates to the level of conviction that the adjudicator must attain before considering a fact established, while the objective dimension concerns the normative rules that allocate the evidentiary burden and determine the legal consequences of a failure to meet it. Together, these dimensions illustrate how evidentiary standards operate not only as cognitive thresholds but also as normative safeguards in the adjudicative process.
The subjective concept of the burden of proof is inherent to adversarial proceedings, as typified by the Anglo-American legal tradition. Within this model, the initiative for fact-finding rests primarily with the parties, whose opposing procedural roles compel them to propose and present evidence at various stages in order to avoid adverse procedural consequences. According to this conception, exemption from the burden of proof is closely tied to the evidentiary standard – that is, to the degree of persuasion (ranging from probability to near-certainty) that a particular item of evidence must achieve for the fact-finder to accept it as established (Uzelac, 2003: 248; Čalija, 1985). This raises an important theoretical and practical question: is it sufficient for evidentiary standards to be reduced to the subjective inner conviction of the adjudicator, or should the law aspire to a more objective, and ideally measurable, degree of probability with respect to each item of evidence? The former approach emphasizes the discretionary, psychological dimension of judicial persuasion, whereas the latter seeks to impose verifiable thresholds that enhance predictability and consistency.
By contrast, the objective concept of the burden of proof is characteristic of continental European systems. Here, the question of the burden of proof becomes relevant only at the conclusion of the evidentiary procedure. Throughout this process, the court is not limited to evidence proposed by the parties but is empowered – indeed obligated – to order the presentation of evidence ex mero motu whenever necessary to clarify legally decisive facts. The application of the burden of proof thus depends heavily on the evidentiary standard prevailing in the system in question. Where a high standard of proof is required, the rules governing the burden of proof acquire greater importance, as it is more likely that uncertainty will persist after the evidentiary process has been exhausted. Conversely, where the evidentiary threshold is lower, the need to resort to burden of proof rules diminishes, since facts can more readily be regarded as established without their application. In this way, continental systems exhibit a proportional relationship between evidentiary standards and the functional role of the burden of proof: the higher the standard, the broader the applicability of burden of proof rules; the lower the standard, the more their practical significance recedes (Uzelac, 2003).
In contemporary practice, the system of so-called statutory or bound assessment of evidence has been largely abandoned. Under that earlier model, legislation predetermined the probative value of particular forms of evidence, prescribing in advance both the type and quantity of evidence required for a legally decisive fact to be regarded as established. The modern trend, by contrast, entrusts this evaluation to the court under the principle of the free assessment of evidence (Jovašević and Ikanović, 2016: 131–132; Bugarski, 2014: 228–231). Yet, even under this more flexible model, judicial discretion is not unlimited. Factual determinations must remain free from arbitrariness and must be grounded in reasoning that would be acceptable to a reasonable observer (Krapac, 2015: 125; Vargha, 1885). The principle of free assessment therefore presupposes both the independence of the judge's conviction and the rational justifiability of that conviction. It does not license subjective whim, but rather requires reasoned persuasion based on the totality of the evidence.
Importantly, the free assessment of evidence does not represent the final stage in the evolution of evidentiary evaluation. Advances in science and technology – most notably in digital forensics, biometric identification, and probabilistic reasoning – are increasingly reshaping the way courts must approach evidence. The growing complexity of certain forms of proof challenges the adequacy of purely intuitive judicial assessment, pointing toward the need for methodologies that integrate scientific reliability, technical standards, and interdisciplinary expertise. This ongoing development suggests that evidentiary law is moving toward a new paradigm in which the traditional dichotomy between statutory and free assessment is supplemented, if not redefined, by scientific and technological benchmarks.
A brief comparative legal overview of evidentiary standards
The law of evidence provides one of the clearest illustrations of divergence between the two great legal traditions of the modern era: the common law and the continental European civil law system. Both traditions pursue the same overarching aim – to ensure reliable fact-finding and fair adjudication – yet they employ distinct conceptual frameworks, standards, and institutional arrangements. Common law jurisdictions typically articulate explicit evidentiary thresholds (such as preponderance of the evidence or beyond a reasonable doubt), while continental systems emphasize the principle of free evaluation of evidence, leaving a greater role to the adjudicator's reasoned conviction.
This comparative perspective is not only of theoretical value but also of practical importance for Bosnia and Herzegovina, a jurisdiction rooted in the continental tradition yet increasingly influenced by transnational norms and comparative borrowings. By contrasting Anglo-American evidentiary standards with those of European continental systems, it becomes possible to situate the Bosnian model within the broader landscape and to assess the degree to which it has absorbed – or resisted – common law influences.
General characteristics of the Anglo-Saxon/Anglo-American model
One of the fundamental distinctions between the common law tradition and European continental systems lies in their treatment of evidentiary standards across different types of proceedings. In common law jurisdictions, a strict differentiation is maintained between the standard of proof applicable in criminal proceedings and the standards governing civil litigation. By contrast, in continental systems, while differences exist, the demarcation is often less sharply drawn.
In civil proceedings within common law systems, significantly lower evidentiary thresholds are employed. The most widely applied is the so-called preponderance of the evidence (in the United States) or balance of probabilities (in England). This standard requires that a fact be considered established if its existence appears more probable than its non-existence, implying no more than a reasonable degree of probability. Exceptionally, U.S. law recognizes a higher civil standard, namely clear and convincing evidence, which demands a more substantial degree of probability. However, even this elevated standard does not approach the level required to establish criminal liability (Brkić, 2012: 307; Krapac, 1995; Uzelac, 2003: 224). The clear and convincing evidence test is applied sparingly, typically in civil cases involving issues that carry quasi-criminal implications. In the hierarchy of evidentiary thresholds, it occupies an intermediate position between the ordinary probability of civil cases and the rigorous criminal standard of proof beyond a reasonable doubt (Simović et al., 2024: 35–36, 137, 638).
In criminal cases, Anglo-American jurisdictions demand that all elements of the offense be proven to a degree that excludes any reasonable doubt of the contrary. The beyond a reasonable doubt standard comes into play when the only logical conclusion that can be drawn from the totality of the evidence is that the accused committed the offense (Walen, 2015). The aim here is not to achieve mathematical certainty, but rather what the jurisprudence terms moral certainty – a level of conviction sufficient to eliminate reasonable doubt in the mind of an impartial fact-finder (Damaška, 2021). 1
The dangers of conflating evidentiary standards with mathematical probability were famously illustrated in People v. Collins (438 P.2d 33, Cal. 1968). In that case, the prosecution introduced expert statistical testimony to demonstrate that the probability of another couple matching the defendants’ description was approximately one in twelve million. The California Supreme Court overturned the conviction, holding that the reliance on “trial by mathematics” distorted the evidentiary process, disadvantaged the defense, and ultimately led to a miscarriage of justice. This case underscores that the criminal standard does not seek numerical precision, but rather rational conviction grounded in fairness.
American law further recognizes additional evidentiary thresholds in the context of police action and constitutional protections. The standard of probable cause, introduced in Illinois v. Gates (462 U.S. 213, 1983) and rooted in the Fourth Amendment, requires only a practical, commonsense determination that there is a fair probability that evidence of a crime will be found, thereby justifying the issuance of a search warrant. In the realm of police conduct, two further standards are critical: reasonable belief (a conclusion reasonably supported by circumstances) and reasonable suspicion. The latter was articulated in Terry v. Ohio (392 U.S. 1, 1968), where the U.S. Supreme Court held that an officer may detain and frisk an individual when unusual behavior reasonably suggests potential criminal activity or that the person may be armed and dangerous.
Another common law concept is that of credible evidence, referring not to evidence that is necessarily true, but to evidence worthy of consideration by a jury. Evidence will be deemed credible if it is natural, reasonable, and possible, thereby satisfying the threshold for inclusion in deliberations.
Finally, a structural peculiarity of the common law tradition must be emphasized: the division of functions between a professional judge and a lay jury. In this setting, the sustainability of a verdict often hinges upon the clarity and accuracy of the judge's instructions to the jury regarding the applicable standard of proof. Yet it remains an open question whether juries consistently apply the standard as instructed, since their deliberations are not subject to external scrutiny. This element of unpredictability further distinguishes the common law model from the continental systems, where professional judges both determine facts and apply legal standards.
General characteristics of continental European evidentiary law
Unlike common law jurisdictions, which formulate clear and stratified standards of proof, continental European systems typically refrain from prescribing rigid evidentiary thresholds. Instead, they rely on the principle of free judicial evaluation of evidence (freie Beweiswürdigung / libero convincimento del giudice/intime conviction), which entrusts fact-finders with the responsibility of assessing all evidence presented and forming an independent conviction as to the truth of legally decisive facts (Bayer, 1943; Damaška, 2010).
This model developed in opposition to earlier systems of legal proof (preuve légale, gesetzlicher Beweis), under which the law assigned predetermined probative value to specific categories of evidence (for instance, a confession or a number of eyewitnesses). The modern continental approach is thus designed to ensure both flexibility and rationality: judges are bound neither by rigid evidentiary hierarchies nor by arbitrary personal impressions, but must instead provide reasoned justifications for their conclusions.
At the same time, continental systems do recognize certain gradations of evidentiary probability in specific procedural contexts. Lower thresholds may suffice at the investigative stage (e.g., suspicion or reasonable grounds for searches), while higher levels of persuasion are required for indictments, precautionary measures, or final convictions. Although rarely formulated as precisely as the Anglo-American beyond reasonable doubt test, continental standards reflect a functional spectrum, ranging from suspicion to full conviction, mediated by the principle of judicial reasoning.
Under the German Code of Criminal Procedure, suspicion (Verdacht, Anhaltspunkte vorliegen) is sufficient to authorize investigative measures such as searches. 2 To proceed to indictment, the investigation must provide a “sufficient factual basis” (genügenden Anlass). At trial, the court decides freely on the results of the evidentiary procedure, guided by its inner conviction and an assessment of all evidence presented. The Italian Codice di procedura penale requires fondato motivo (“good reason”) to authorize a search. 3 Precautionary measures, such as detention, are conditioned on the existence of gravi indizi di colpevolezza (“serious indications of guilt”). 4 In evaluating evidence, the judge must not only explain the results of the proof collected but also the criteria applied in reaching conclusions. Indications may form the basis of a finding of fact only if they are gravi, precisi e concordanti (“serious, precise, and consistent”). For a conviction, the Italian system explicitly requires proof al di là di ogni ragionevole dubbio (“beyond reasonable doubt”) (Lupária and Gialuz, 2019: 58–59; Pizzi and Marafioti, 1992). French criminal procedure is likewise rooted in the doctrine of intime conviction, under which jurors and judges must decide based on their inner conviction formed from the evidence presented. While the French Code de procédure pénale does not define the precise quantum of proof required, it provides that jurors shall answer questions “according to the sincere impression they have formed in their conscience”. 5 This standard of intime conviction combines the flexibility of free judicial evaluation with an expectation of rational justification, reflecting the civil law tradition's preference for reasoned persuasion over rigid evidentiary thresholds.
Comparative overview of evidentiary standards: common law and continental systems
The comparative study of evidentiary standards reveals two distinct yet increasingly interacting traditions: the Anglo-American common law model and the continental European civil law model. While both pursue accuracy in fact-finding and the protection of individual rights, their approaches diverge in important ways, shaped by differences in institutional design, legal culture, and historical development.
Nature of evidentiary standards
Common law systems articulate evidentiary standards with notable precision, establishing distinct thresholds for different types of proceedings. In civil litigation, the preponderance of the evidence standard requires a showing that a fact is more likely than not, while more serious deprivations – such as involuntary commitment or termination of parental rights – demand proof by clear and convincing evidence. 6 In criminal proceedings, the Constitution requires proof beyond a reasonable doubt, a principle firmly established in In re Winship, where the Court held that the Due Process Clause protects an accused from conviction absent such proof. 7 On appellate review, the sufficiency of evidence is assessed by asking whether “any rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt”. 8
The common law also employs graded thresholds at preliminary stages. Investigative measures must be supported by reasonable suspicion, 9 while arrests and searches require probable cause, evaluated under the “totality of the circumstances” test. 10 These layered standards function as normative instructions for fact-finders, especially juries, and provide relatively clear benchmarks for judicial review.
By contrast, continental European systems traditionally avoid codifying rigid evidentiary thresholds. Instead, they adhere to the principle of the free evaluation of evidence (libre appréciation de la preuve/freie Beweiswürdigung), which entrusts judges – or mixed tribunals of judges and lay assessors – with forming an independent conviction based on the totality of the evidence. German criminal procedure expresses this explicitly in § 261 StPO, which provides that “the court decides on the result of the evidence-taking according to its free conviction, gained from the totality of the proceedings”. 11 Similarly, French law directs assize jurors to decide by intime conviction rather than by formulaic instructions. 12
Comparative scholarship, particularly the work of Mirjan Damaška, links these divergences to deeper institutional structures: professional judges with reason-giving duties in civil law systems, as opposed to lay juries in common law jurisdictions (Damaška, 1986). Yet signs of convergence are visible. Notably, the 2006 Italian reform inserted the phrase “oltre ogni ragionevole dubbio” into Article 533 of the Codice di procedura penale, thereby explicitly requiring acquittal whenever reasonable doubt remains (Picinali, 2009: 9). This reform illustrates how continental systems have begun to import more defined thresholds under the influence of broader transnational standards.
Role of the adjudicator
In common law jurisdictions, evidentiary standards function primarily as constraints on lay juries, which, though instructed by professional judges, deliberate in secrecy. This institutional arrangement necessitates the articulation of relatively clear and formulaic standards to secure consistency, fairness, and appellate reviewability. For example, the U.S. Supreme Court in Jackson v. Virginia emphasized that sufficiency review requires courts to ask whether any rational fact-finder could have found guilt beyond a reasonable doubt. 13 The Court has also cautioned against ambiguous instructions: while the “moral certainty” formulation was once widely used, it is now acceptable only if clarified to convey reasoned conviction rather than subjective impression. 14 These examples illustrate how evidentiary standards in the common law are tailored both to guide juries and to create portable, reviewable benchmarks for appellate scrutiny (Damaška, 2008).
By contrast, continental systems assign responsibility for both fact-finding and legal reasoning to professional judges – or, in some contexts, to mixed tribunals of judges and lay assessors. The legitimacy of verdicts rests not on formulaic thresholds but on the judge's duty to form an inner conviction through rational evaluation of all evidence and to articulate this conviction in a reasoned judgment. German law codifies this in § 261 StPO, which entrusts the court with deciding according to its “free conviction” drawn from the trial as a whole, 15 while French law directs jurors to base their decision on intime conviction. 16 The European Court of Human Rights has further reinforced this justificatory culture, holding in Taxquet v. Belgium [GC] (App. No. 926/05, 16 November 2010, §§ 90–92) that jury verdicts must be sufficiently reasoned to satisfy Article 6 guarantees of a fair trial.
Thus, while common law evidentiary standards are designed to constrain and guide non-professional fact-finders, continental systems rely on the professional competence and justificatory obligations of judges, treating written reasoning as a safeguard against arbitrariness in place of rigid thresholds.
Spectrum of proof
Despite their structural differences, both common law and continental systems recognize a spectrum of evidentiary probability designed to regulate decision-making across procedural stages.
In the common law tradition, this spectrum is articulated through formally defined categories (reasonable suspicion, probable cause, preponderance, clear and convincing, beyond reasonable doubt). At the investigative stage, police action requires reasonable suspicion, 17 while arrests and searches must be supported by probable cause, assessed under the “totality of the circumstances” test. 18 In civil adjudication, liability is typically established on a preponderance of the evidence, while more serious infringements of individual rights, such as involuntary civil commitment, demand clear and convincing evidence. 19 At the apex stands the criminal standard of proof beyond a reasonable doubt, constitutionally entrenched in In re Winship. 20 This calibrated ladder of proof standards reflects the common law's concern with constraining fact-finders, particularly juries, and providing reviewable benchmarks for appellate oversight.
By contrast, continental systems generally eschew rigid categorical thresholds, yet they too operate with functional gradations tailored to distinct procedural stages. In Germany, for example, (i) the initiation of an investigation requires zureichende tatsächliche Anhaltspunkte (sufficient factual indications) under § 152(2) StPO, 21 (ii) an indictment requires genügenden Anlaß / hinreichend Tatverdacht (sufficient grounds/suspicion) under §§ 170(1), 203 StPO, 22 and (iii) pre-trial detention may be imposed only upon dringender Tatverdacht (strong suspicion) coupled with specified grounds under § 112 StPO. 23 Similarly, Italy conditions precautionary measures on the existence of gravi indizi (serious indications), while since the 2006 reform, final conviction requires proof oltre ogni ragionevole dubbio (beyond a reasonable doubt) under Article 533 of the Codice di procedura penale. In France, the criminal process culminates in the verdict of guilt based on intime conviction. 24
Comparative scholarship underscores that these gradations, whether formalized or implicit, function as mechanisms for allocating the risk of error across different stages of proceedings. As Damaška (1986) has argued, the shape of these standards is closely tied to institutional structures, while Roberts and Zuckerman (2010) highlight their role in structuring adjudicative rationality. More recently, Allen and Pardo's (2019) “relative plausibility” theory has sought to explain proof at trial as a comparative evaluation of competing narratives, further illustrating that across traditions, evidentiary standards embody a balance between accuracy, efficiency, and the protection of rights.
Concept of certainty
In the Anglo-American tradition, the standard of proof beyond a reasonable doubt has long been framed in terms of moral certainty, expressly distancing itself from mathematical or probabilistic quantification (Franklin, 2005). The risks of conflating probability with persuasion were dramatically illustrated in People v. Collins, where a conviction based on statistical odds was overturned because the prosecution's reliance on multiplicative probabilities substituted speculative arithmetic for juridical reasoning. 25 The U.S. Supreme Court has similarly cautioned against probabilistic formulations, permitting the use of “moral certainty” only where it is explained as conviction grounded in reason and evidence rather than in numeric likelihood. 26
Continental systems adopt a parallel orientation. While they also resist quantification, the operative safeguard lies in the requirement of intime conviction or freie Beweiswürdigung as disciplines of rational persuasion. In France, Article 353 of the Code de procédure pénale instructs jurors to consult both conscience and reason without reliance on prescriptive formulas, while in Germany § 261 StPO requires judges to reach conviction on the basis of the totality of the evidence presented at trial. Such formulations preserve flexibility while simultaneously imposing a duty of rational justification.
At the supranational level, the European Court of Human Rights deploys its own version of the “beyond reasonable doubt” formula for evaluating allegations of rights violations. Yet here, too, the standard is explicitly insulated from quantification: proof may be inferred from “sufficiently strong, clear and concordant” indicia, a formulation that mirrors continental safeguards by privileging qualitative coherence over numeric thresholds (Ireland v. the United Kingdom, App. No. 5310/71, 18 January 1978, § 161).
Taken together, these approaches demonstrate a shared concern across legal traditions: to preserve the flexibility of inner conviction while constraining arbitrariness through qualitative safeguards, thereby maintaining the legitimacy of fact-finding without reducing it to probabilistic calculation.
Convergence and cross-pollination in evidentiary standards
In recent decades, both common law and continental systems have displayed significant tendencies toward convergence in the articulation and application of evidentiary standards. In the common law tradition, courts have increasingly underscored the necessity of rational justification in jury verdicts and judicial instructions. The U.S. Supreme Court's clarification in Victor v. Nebraska of the “moral certainty” formula, alongside the rational-trier-of-fact test articulated in Jackson v. Virginia, exemplifies this movement toward ensuring that verdicts are not only intuitive but also reviewable through rational criteria.
Continental jurisdictions, traditionally less reliant on formal standards, have simultaneously been influenced by the jurisprudence of the European Court of Human Rights to articulate evidentiary thresholds with greater clarity. The Grand Chamber's judgment in Taxquet v. Belgium established that the failure to provide sufficient reasoning for a jury verdict may contravene Article 6 of the European Convention, thereby spurring reforms designed to render fact-finding more intelligible and reviewable. Italy's 2006 statutory incorporation of the “beyond reasonable doubt” formula into Article 533 of the Codice di procedura penale provides a paradigmatic example of this trend.
More broadly, comparative scholarship has emphasized these developments as emblematic of a gradual cross-pollination between traditions. As Damaška (1997), Roberts and Zuckerman (2010), Allen and Pardo (2019), and Ho (2008) have noted, both families of law are moving toward a shared emphasis on reason-giving, proportionality, and the rational calibration of evidentiary thresholds. Yet, even as these points of convergence multiply, each tradition preserves its distinctive institutional identity: the common law retains its reliance on jury deliberation, while continental systems continue to foreground the written justification of professional judges.
The degrees of judicial conviction in criminal proceedings: Between certainty, probability, and doubt – application in Bosnia and Herzegovina
The evidentiary process in criminal proceedings culminates in the evaluation of evidence, which represents the decisive judicial activity through which the ultimate goal of evidence is achieved: the establishment of facts relevant to the case. As Simović and Simović (2016: 374) emphasize, the evaluation of evidence constitutes “the last, final and most important activity of the court” in criminal proceedings, as it enables the judge to reach a conclusion regarding the truth or falsity of legally significant facts.
Through the act of evaluating evidence, the judge develops a conviction regarding the existence or non-existence of a fact. This conviction is not merely a psychological state but a structured legal standard conditioned by procedural law, legal doctrine, and epistemological considerations. As Vasiljević (1981: 314) points out, the truth in criminal proceedings is not absolute but emerges from the balance between reasons supporting the truth of a fact and reasons speaking against it. In this sense, evidentiary truth in criminal law is a product of dialectical tension between competing grounds, rather than a metaphysical or purely objective certainty.
Criminal procedure legislation recognizes different degrees of intensity of judicial conviction, which reflect the legislator's attempt to calibrate the threshold of persuasion according to the gravity of the decision to be made. In Bosnia and Herzegovina, as in many continental systems, three principal degrees are distinguished: certainty, probability, and doubt.
Certainty represents the highest standard of conviction. It exists when all reasons support the truth of a fact to the extent that a reasonable person, experienced in social relations, would not entertain any doubt (Marković, 1930: 324–325; Ogorelica, 1899: 325–326). This degree of conviction is required for decisions with the gravest consequences, particularly the rendering of a criminal verdict. In other words, certainty corresponds to the “beyond a reasonable doubt” standard known in Anglo-American jurisprudence, although doctrinally framed in civil law systems in slightly different terminology.
Probability, on the other hand, denotes a state where the judge is not fully convinced of the truth of a fact but where the reasons supporting truth outweigh those against it. Probability thus occupies a middle ground between certainty and doubt. In practice, this degree of conviction is sufficient for decisions made at the pre-trial or investigative stage – such as authorizing evidentiary measures, ordering precautionary actions, or conducting investigative procedures – where the law explicitly allows reliance on a lower threshold of persuasion. Here, the principle of proportionality comes into play: the severity of the intrusion into fundamental rights dictates the required degree of judicial conviction. The concept of probability, therefore, ensures procedural flexibility while preventing premature conclusions of guilt at an early stage.
Doubt represents the lowest degree of conviction, existing when the reasons for and against the truth of a fact are equal or when the reasons against predominate. Here, legislation and doctrine distinguish between suspicion and well-founded suspicion. The grounds for suspicion are based on factual indicators that indirectly suggest the possibility of a criminal offense or implicate a specific person as its potential perpetrator. 27 Well-founded suspicion, by contrast, represents a qualitatively higher level, arising from the cumulative evaluation of circumstantial evidence and frequently determined through methods of elimination, accumulation, or diffusion (Modly, Petrović and Korajlić, 2004: 66). 28 The progression from mere suspicion to well-founded suspicion marks a critical transition: while prosecutors are empowered to initiate investigations based on grounds for suspicion, the decision to confirm an indictment – and thus confer the status of accused upon the suspect – requires the higher threshold of well-founded suspicion. Тhis threshold is often conceptualized in theory as “serious doubt”, “quite sufficient doubt”, or “reasonable doubt”, representing a gradation within the broader category of judicial uncertainty (Sijerčić-Čolić et al., 2005: 93).
From a theoretical perspective, the gradation of judicial conviction reflects a dialectical continuum of epistemic certainty, in which quantitative accumulation of evidence may lead to qualitative transformation of suspicion into well-founded suspicion, and ultimately into judicial certainty. This is particularly visible in the pre-trial stage, where evidentiary thresholds guide the incremental restriction of individual rights – first through investigative measures, later through indictment, and finally through conviction. It should also be noted that legal systems do not always employ the terms certainty, probability, or doubt explicitly in statutory texts. Instead, they often resort to functional equivalents, such as “reasonable suspicion”, “well-founded grounds”, or “convinced beyond doubt”, which serve as normative placeholders for the degrees of conviction required at different procedural junctures. The comparative dimension here is instructive: while civil law systems codify such degrees with greater precision, common law systems operationalize them through judicial standards and case law, particularly around the notion of “proof beyond a reasonable doubt”.
The comparative perspective reveals a broader theoretical development. Common law systems traditionally express the highest threshold through the standard of proof beyond reasonable doubt, while continental systems, including Bosnia and Herzegovina, speak of certainty. Both, however, aim to capture the same epistemic state: a conviction so strong that any remaining doubt is not rationally sustainable. Similarly, intermediate thresholds (such as probable cause in the United States or osnovana sumnja in Bosnia and Herzegovina) regulate pre-trial measures, reflecting a functional convergence between legal traditions. 29
The theoretical interpretation of the highest evidentiary standards reveals both convergence and divergence between continental and common law traditions. In continental European systems, the threshold of certainty (certitudo) reflects a rationalist heritage: judicial conviction must reach a point where the totality of evidence logically excludes any reasonable alternative explanation. The standard is traditionally linked to the concept of intime conviction – a state of persuasion grounded in rational evaluation rather than metaphysical or absolute knowledge (Krapac, 2015: 125; Marković, 1930: 324–325). Thus, certainty in criminal procedure is not absolute but practical, shaped by the epistemic limits of adjudication.
By contrast, the Anglo-American formula of proof beyond a reasonable doubt emerged from the need to instruct lay juries in moral and intelligible terms. Rather than demanding affirmative certainty, it sets a negative boundary: not every doubt prevents conviction, only one that would remain rational for an impartial and conscientious person (In re Winship, 397 U.S. 358, 364, 1970). This formulation acknowledges that human knowledge cannot achieve absolute certainty and instead protects against wrongful conviction by excluding only doubts that are rationally sustainable.
Despite their different formulations, both standards share a common functional purpose: they articulate the highest threshold of persuasion in criminal law, tied to the principle in dubio pro reo and the protection of the accused against wrongful conviction (Brkić, 2012: 319–320). Both reject metaphysical certainty and instead require a degree of conviction strong enough to exclude rational doubt as to decisive facts.
The distinction, therefore, lies less in epistemic threshold than in conceptual emphasis. Certainty projects a positive state of judicial knowledge, whereas beyond a reasonable doubt emphasizes the absence of rational counter-reasons. Comparative scholarship (Shapiro, 1991; Tuzet, 2023; Zeve, 1998) underscores that while the two standards are functionally equivalent, their linguistic framing and historical evolution diverge. The continental model reflects the rationalist and professionalized adjudication of civil law systems, while the common law standard mirrors the communicative and moral demands of jury trials. This difference is not merely semantic but reveals distinct cultural assumptions about how adjudicators should be guided in their evaluation of evidence.
The apparent equivalence of certainty and beyond a reasonable doubt conceals their distinct intellectual genealogies. Shapiro (1991) demonstrates that both standards derive from early modern debates on moral certainty and probabilism, especially within theological and philosophical traditions that sought to reconcile faith, reason, and proof. The Anglo-American expression was shaped by the need to address lay juries in religiously resonant terms, linking conviction to the conscience of a “reasonable” Christian juror. Continental legal thought, by contrast, absorbed rationalist and Enlightenment epistemologies, embedding the concept of certitudo in a professionalized model of adjudication. Modern theorists highlight this divergence. Tuzet (2023) emphasizes that certainty reflects a rationalist aspiration to coherence, whereas beyond reasonable doubt reflects a pragmatic test of the resilience of belief under counter-argument. Zeve (1998) conceptualizes both standards as forms of justified belief that exclude rational doubt, while Littlejohn (2020) situates them within broader epistemic theories of truth and knowledge. Empirical work (Smith, 2022) adds a further dimension, showing how linguistic framing affects juror comprehension and the practical communication of evidentiary thresholds. Taken together, this illustrates that while doctrinally convergent in function, the standards reflect different historical compromises: one grounded in judicial rationality, the other in lay persuasion (Table 1).
While both standards ultimately protect against wrongful conviction by requiring exclusion of rational doubt, certainty emphasizes a positive conviction of truth, whereas beyond reasonable doubt emphasizes the absence of rational counter-reasons. The difference is largely one of legal culture and linguistic framing, rather than substantive threshold.
The analysis of Bosnian-Herzegovinian criminal procedure and doctrine suggests that the evidentiary standard applied at the stage of conviction has not undergone a substantive transformation with the recent use of the expression beyond a reasonable doubt. Rather, what we observe is primarily a shift in nomenclature and comparative alignment, not a change in the underlying epistemic threshold. Traditional doctrine in Bosnia and Herzegovina, following the broader continental European tradition, has long demanded certainty (izvjesnost) as the highest degree of judicial conviction – defined as a state in which no rational doubt remains. This corresponds functionally to the Anglo-American standard of proof beyond a reasonable doubt, which excludes all doubts that would be rationally sustainable.
The growing appearance of the phrase beyond a reasonable doubt in judicial practice in Bosnia and Herzegovina reflects both the influence of comparative jurisprudence and the harmonizing effect of the European Court of Human Rights, rather than the introduction of a substantively higher or lower threshold of persuasion. In other words, judges have always applied a standard that requires exclusion of rational doubt; what is changing is the language used to describe it. The continental formulation of certainty projects an affirmative state of conviction, while the Anglo-American terminology emphasizes the absence of rational counter-reasons. Despite these semantic and cultural nuances, both formulations ultimately require the same epistemic state.
Accordingly, it is more accurate to say that Bosnia and Herzegovina has not adopted a new evidentiary standard, but rather rearticulated its traditional doctrine of certainty in the vocabulary of beyond a reasonable doubt, aligning domestic discourse with international and comparative models.
While the domestic framework of Bosnia and Herzegovina demonstrates that the standard of certainty has long performed the same functional role as the common law's beyond a reasonable doubt, the analysis would be incomplete without considering the supranational dimension. Under Article II/2 of the Constitution of Bosnia and Herzegovina, the European Convention on Human Rights forms an integral part of the domestic legal order, and the jurisprudence of the European Court of Human Rights directly binds domestic authorities. This makes Strasbourg case law particularly significant for understanding how evidentiary standards are to be articulated and applied in practice.
And what about the ECtHR?
The position of the European Court of Human Rights (ECtHR) is of particular relevance for Bosnia and Herzegovina. Pursuant to Article II/2 of the Constitution of Bosnia and Herzegovina, the European Convention on Human Rights forms an integral part of the domestic legal order and has supremacy over all other law. This constitutional arrangement means that Strasbourg jurisprudence does not merely exert persuasive authority but directly binds Bosnian courts in their application of evidentiary standards.
In line with its general approach that the admissibility and evaluation of evidence primarily fall within the competence of domestic legal systems, the ECtHR has refrained from prescribing a uniform standard of proof for national criminal convictions. National authorities remain responsible for assessing witness credibility, determining the relevance of evidence, and applying the procedural safeguards embedded in their domestic legal traditions. Nonetheless, the Court has developed important principles relevant to evidentiary standards under the fair trial guarantee of Article 6.
Most significantly, the Court itself applies the standard of proof beyond reasonable doubt when determining whether there has been a violation of the Convention (Nachova and Others v. Bulgaria [GC], App. No. 43577/98, 6 July 2005, § 147). While it stresses that its task is not to rule on individual criminal guilt or civil liability, this formulation underscores the seriousness of the threshold it employs (Ringvold v. Norway, App. No. 34964/97, 11 February 2003). Importantly, Strasbourg has consistently clarified that beyond reasonable doubt in its jurisprudence does not entail mathematical certainty. Instead, it may be satisfied through the cumulative weight of “sufficiently strong, clear and concordant” indicia (Nachova and Others v. Bulgaria [GC], App. No. 43577/98, 6 July 2005, § 147). This mirrors the continental emphasis on qualitative safeguards, such as the seriousness, precision, and consistency of indicia, and complements the common law rejection of purely probabilistic formulations.
The Court's scrutiny under Article 6 is directed not at substituting its judgment for that of domestic courts but at ensuring that the trial as a whole is fair. To this end, the ECtHR has intervened where evidentiary evaluation can be regarded as arbitrary or capricious. Examples include instances where vulnerable witnesses were relied upon without sufficient safeguards for the rights of the defense, where convictions were based primarily on indirect or contested evidence without adequate caution, or where questions of authenticity and reliability were left unresolved (Melnychuk v. Ukraine (dec.), App. No. 28743/03, 5 July 2005). In such cases, the Court has required heightened diligence in evaluating the evidence.
Beyond the treatment of problematic evidence, Strasbourg case law emphasizes the centrality of reasoned judgments. A conviction will be found incompatible with Article 6 where the domestic court fails to explain why exculpatory witnesses were not heard, offers no justification for a conviction on evidence previously deemed insufficient for acquittal, neglects to address defense arguments or exculpatory material, or otherwise provides manifestly inadequate reasoning (Vidal v. Belgium, App. No. 1351/86, 22 April 1992, §§ 32–34; Salov v. Ukraine, App. No. 5518/01, 6 September 2005). While the ECtHR generally defers to national courts, it considers the absence of adequate reasoning or the presence of manifest unreasonableness as decisive indicators of unfairness (Navalnyy and Ofitserov v. Russia, App. No. 46632/14, 23 February 2016, §§ 114–116).
For Bosnia and Herzegovina, these principles have direct implications. First, they confirm that the highest evidentiary threshold in domestic law – whether expressed as certainty or as beyond reasonable doubt – must be understood in light of Strasbourg's jurisprudence. What matters is not the linguistic formula but whether domestic judgments demonstrate careful evaluation of problematic evidence and provide sufficient reasons to justify conviction. Second, they explain why the terminology of “beyond a reasonable doubt” increasingly appears in Bosnian case law: the direct incorporation of the Convention obliges courts to adopt the Strasbourg vocabulary when aligning domestic standards with European guarantees. Finally, the jurisprudence of the ECtHR underscores that evidentiary standards are not only epistemic thresholds but also procedural guarantees, ensuring transparency, accountability, and protection against arbitrariness in the criminal process.
Thus, the Strasbourg perspective adds a crucial third dimension to the comparative analysis. Alongside the continental notion of certainty and the common law standard of beyond reasonable doubt, the ECtHR offers a hybrid formulation: one that adopts the language of reasonable doubt while operationalizing it through qualitative indicia and reasoned justification. For Bosnia and Herzegovina, whose legal order constitutionally integrates the Convention, this tripartite influence confirms that the evolution of evidentiary standards is best understood not as a radical doctrinal shift but as a process of harmonization, where traditional categories are rearticulated in a vocabulary consistent with European human rights law.
Taken together, the jurisprudence of the European Court of Human Rights confirms that evidentiary standards in Bosnia and Herzegovina cannot be understood solely through the lens of domestic doctrine or comparative influence. Because the Convention is constitutionally incorporated into the legal order, Strasbourg principles operate as binding guidance on how standards such as certainty or beyond reasonable doubt must be interpreted and justified in practice. This supranational dimension thus provides the final layer of analysis, setting the stage for broader conclusions about continuity, adaptation, and harmonization in the Bosnian system of criminal proof.
Conclusion
The analysis of evidentiary standards demonstrates that criminal procedure, across legal traditions, grapples with the same fundamental challenge: how to determine the degree of conviction necessary to justify decisions that profoundly affect individual rights and societal order. Whether articulated as certainty in the continental tradition or beyond a reasonable doubt in the common law, the ultimate goal is to ensure that verdicts of guilt rest on a foundation that excludes rational doubt, thereby safeguarding the accused against wrongful conviction while preserving the legitimacy of criminal adjudication.
From a comparative perspective, the study reveals that both traditions have pursued this objective through different institutional and cultural pathways. Common law jurisdictions, shaped by the presence of lay juries and the imperative of communicability, developed formulaic verbal standards intended to guide non-professional fact-finders and facilitate appellate review. By contrast, continental systems, founded upon professionalized adjudication and rationalist legal culture, historically avoided prescriptive verbal formulas, entrusting judges with the responsibility to form their intime conviction or “inner certainty” and to articulate their reasoning in written judgments. These divergent approaches are not merely stylistic but reflect deeper structural differences in the allocation of authority, the role of justification, and the epistemology of proof.
At the same time, the comparative inquiry shows an unmistakable trend toward convergence. Common law systems have increasingly emphasized the need for rational justification and transparency in verdicts, moving beyond the simple invocation of moral certainty toward standards that must withstand rational scrutiny. Conversely, continental systems, under the influence of the European Court of Human Rights and comparative cross-pollination, have begun to adopt more explicit verbal standards. Italy's 2006 statutory introduction of the “beyond a reasonable doubt” formula exemplifies this trend, while the jurisprudence of the ECHR – particularly Taxquet v. Belgium – has reinforced the obligation to provide reasons for verdicts, even where lay juries are involved.
Against this backdrop, the position of Bosnia and Herzegovina acquires particular significance. The domestic criminal procedure legislation and doctrine have long distinguished between three degrees of conviction: certainty, probability, and doubt. Certainty, as the highest threshold, has historically been understood as the standard required for criminal conviction, reflecting the continental rationalist model. Probability has guided decisions at earlier stages, particularly investigative and precautionary measures, while suspicion and well-founded suspicion have structured the initiation of proceedings and indictments. This doctrinal structure demonstrates that the system already possessed a calibrated spectrum of evidentiary thresholds, functionally equivalent to the gradations found in the common law.
The more recent invocation of the formula beyond a reasonable doubt in Bosnian judicial practice does not, therefore, signify the introduction of a new evidentiary standard in substantive terms. Rather, it reflects a process of terminological adaptation and alignment with international discourse, especially under the influence of the jurisprudence of the European Court of Human Rights and comparative legal scholarship. The traditional demand for certainty in Bosnian doctrine already required a state of conviction in which no rational doubt remained – a condition functionally indistinguishable from the Anglo-American standard. The shift in vocabulary can thus be read as part of a broader movement toward harmonization of legal language in the European space, rather than as evidence of a doctrinal transformation.
This conclusion has several implications. First, it underscores the resilience of continental evidentiary theory, which continues to frame the standard of conviction in terms of rationally grounded certainty, even as it adopts the comparative terminology of reasonable doubt. Second, it highlights the importance of linguistic framing: although certainty and beyond a reasonable doubt may be functionally equivalent, their rhetorical emphases differ – one projecting an affirmative state of knowledge, the other stressing the absence of rational counter-reasons. This difference, while subtle, can shape judicial discourse, legal education, and public understanding of the criminal process. Third, it shows how comparative and international influences, particularly the case law of the ECtHR, are shaping the evolution of evidentiary law in Bosnia and Herzegovina, not by displacing existing doctrine but by rearticulating it in a form more recognizable within transnational legal dialogue.
Finally, the analysis demonstrates the enduring relevance of evidentiary standards as a field of doctrinal reflection and practical significance. In a legal environment marked by increasing interconnection between domestic, regional, and international norms, Bosnia and Herzegovina illustrates the dynamic interaction between tradition and convergence. Its experience suggests that the future of evidentiary standards will not be one of uniformity imposed from outside, but of gradual adaptation, where shared functional objectives are expressed through different but increasingly overlapping conceptual vocabularies.
In this light, the question of whether Bosnia and Herzegovina has adopted a “new” standard of proof must be answered with caution. The substantive threshold of judicial conviction has remained constant: judges must be convinced to a degree that excludes rational doubt before imposing criminal liability. What has changed is the discursive framework through which this threshold is described. The adoption of the language of “beyond a reasonable doubt” does not displace the traditional doctrine of certainty but complements it, situating Bosnian practice within a broader comparative and European legal discourse.
The conclusion, therefore, is twofold. First, Bosnia and Herzegovina has always applied, in substance, the same highest standard of conviction as its common law counterparts, even if expressed in the language of certainty rather than reasonable doubt. Second, the growing use of the latter terminology signals not a doctrinal rupture but a symbolic alignment with international standards, reflecting both the influence of the European Court of Human Rights and the aspiration to communicate domestic legal concepts in a vocabulary intelligible beyond national borders.
Ultimately, the evolution of evidentiary standards in Bosnia and Herzegovina exemplifies the dialectical relationship between continuity and change: a legal system remains faithful to its doctrinal roots while simultaneously adapting its conceptual language to resonate within a broader transnational legal order. In doing so, it demonstrates that the pursuit of evidentiary truth in criminal law remains, across traditions, a shared commitment to fairness, rationality, and the protection of individual rights.
Footnotes
Funding
The author received no financial support for the research, authorship, and/or publication of this article.
Declaration of conflicting interests
The author declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.