Attorney-at-LawMarian Georgiev IvanovBG

Criminal law · Theory and practice

Mistake of Fact and Deviation in the Causal Process

The object of intent, negligence, and individualized attribution of a culpably caused result

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US-English translation · Bulgarian law · Български оригинал

Abstract

This study examines discrepancies between the actual circumstances and the actor's understanding in intentional and negligent offenses. It analyzes Article 14 of the Criminal Code, including its application to normative elements of an offense, and distinguishes mistakes of fact from mistakes of law. Mistaken identity, deviation of the act's impact, and material changes in the causal process receive separate consideration. The study argues for a specific assessment of culpability in relation to each affected target rather than an automatic transfer of intent. It also addresses successive acts performed under a mistaken belief that the offense is complete and evidentiary safeguards against hindsight-based presumptions.

Keywords: mistake of fact; intent; negligence; causal process; aberratio ictus; mistake of law; Article 14 of the Criminal Code.

Contents of the article

1. Why the result alone does not establish intent

Criminal liability cannot be based solely on what objectively occurred. It is also necessary to establish how the actor understood the factual situation at the time of the conduct. Mistake of fact raises precisely this question: do the actual circumstances constituting the offense coincide with the person's understanding of them, and what is the legal significance of any discrepancy?

Article 14 of the Criminal Code connects ignorance of facts constituting an offense with the exclusion of intent. For negligent liability, it must additionally be examined whether that ignorance itself resulted from negligence. Mistake is therefore neither a universal ground for impunity nor merely a mitigating circumstance. It may alter the legal classification itself or exclude criminal liability. [1]

This analysis advocates a distinction between a mistake concerning a factual element of the offense and a deviation in the way the intended result actually occurs. The former concerns the content of awareness; the latter requires an assessment of whether the actual causal process remains within the scope of the culpable conduct. Not all ignorance is legally relevant, nor must every causal detail have been anticipated.

2. The subject matter of a mistake of fact

A mistake may concern the subject matter of the offense, the victim's status, the nature of the act, particular circumstances, or another fact forming part of the offense. Where a person takes an item genuinely believed to be their own, the question is not whether they have read the provision on theft but whether they are aware that the item belongs to someone else. Not every mistaken assessment of an everyday situation, however, amounts to ignorance of a fact constituting an offense.

The distinction is illustrated by property belonging to another. Believing that a particular item is one's own because of a factual mix-up differs from knowingly taking another's property in the belief that this is a permissible means of collecting a debt. In the second case, the facts may be understood correctly while the right to self-help is misunderstood. Whether the elements of theft, unlawful self-help, or another offense are present must be decided separately, not through an automatic invocation of Article 14. [1]

For circumstances qualifying an offense for more severe treatment, the mental attitude required by law must be examined. A more serious classification cannot be inferred solely from the objective existence of a special feature. Conversely, one cannot generally assert that ignorance always excludes the aggravated offense: Article 11(5) contains a special rule for additional socially dangerous consequences. Each feature must be located within the offense's elements and assessed under the applicable culpability rules. [1]

3. Mistake of fact, mistake of law, and normative elements

The distinction between fact and law becomes more complex when an offense uses normative concepts: an official, another's property, an official document, or a permit. The actor need not know the exact legal definition. What matters is awareness of the factual and social substance of the circumstance evaluated by law. A lack of legal education does not mean a lack of intent.

Conversely, the legal character of a circumstance does not permit fictitious knowledge of the facts giving rise to it. Interpretative Decision No. 1 of June 7, 2016, in interpretative case No. 1/2016 of the General Assembly of the Criminal Division of the Supreme Court of Cassation examines knowledge of a previous administrative penalty for the offense under Article 343c(2). The court distinguishes the validity of service effected without the recipient's presence from proof of actual knowledge: neither deemed service nor the absence of personal service replaces a factual inquiry. [2]

As a method, this holding has significance beyond the particular offense: a procedural act may produce legal consequences without itself proving the addressee's mental attitude. Conversely, knowledge may be established through other admissible evidence. Actual awareness must be analyzed rather than presumed in favor of either the prosecution or the defense.

4. Excluded intent and possible negligent liability

Once a mistake of fact is established, the analysis does not end with the absence of intent. It must be determined whether the particular offense is also punishable when committed negligently and whether the ignorance resulted from a failure to exercise care that was required and possible. Negligent conduct is punishable only in the cases provided by law. There is therefore no general offense of “negligent theft” automatically replacing excluded intent. [1]

The required care cannot be defined solely by the adverse result. It must be established what specifically could have been checked, what reason for checking existed, and whether the person had the necessary opportunity. Inability to recognize a fact and an unjustified refusal to perform an available check are different situations.

Consider a worker using the contents of a mislabeled container. If the labeling and work arrangements gave no reason for suspicion, the mistake must be assessed differently from a situation in which clear warning signs were knowingly disregarded. Another person's labeling error does not necessarily exclude the worker's responsibility, but neither does it automatically create it. Each participant is responsible for their own required standard of care.

5. Mistaken identity and deviation of impact

Mistaken identity of the directly affected target and deviation of impact must not be merged into one category. In the first situation, the actor directs the conduct at the person perceived but identifies that person incorrectly. In the second, an act directed at one target affects another because execution or the causal process deviates.

Where the selected and perceived person is the one actually affected, but their name is mistaken, the error may be irrelevant to the basic offense if the legally relevant characteristics coincide. Where the person's status is a constitutive or aggravating feature, however, the question requires further assessment. Biographical identity and status under criminal law are not the same thing.

In a deviation of impact, traditionally described as aberratio ictus, it is insufficient to assert that intent is “transferred” to the actual victim. The Criminal Code contains no general rule providing for such an automatic transfer. The inquiry must address the original target, foresight of harm to others, and the actor's attitude toward that possibility. [1]

The approach preferred here specifies culpability for each affected target. Where direct intent toward one person and negligent causation concerning another are proven, an attempt combined with a negligent offense may be considered if the relevant elements and the requirements for concurrence are satisfied. The analysis differs where harm to the other person was consciously accepted. This is a reasoned framework for differentiation, not a claim that all cases necessarily receive the same predetermined classification.

6. Material and immaterial deviations in the causal process

Intent does not require the actor to have foreseen every physical detail of causation. In result-based offenses, however, there must be a substantive connection between the conduct understood by the actor and the result that actually occurred. “Immaterial deviation” is useful only if it is explained why the difference does not alter the nature of the causation encompassed by culpability.

A practical guide is to ask whether the danger created by the intentional conduct materialized or whether a qualitatively different, independent process arose. Temporal proximity, mechanism, third-party intervention, and the unusual nature of the development are relevant. None is independently sufficient: a rare medical mechanism is not necessarily unforeseeable in criminal law, and temporal proximity does not prove causation.

Two objections must be distinguished. The first is that the conduct did not cause the result at all. The second is that the result caused was not encompassed by the established intent. Rejecting one does not automatically defeat the other. Legally relevant causation and culpability are separate elements of the charge.

7. Successive acts and a mistaken belief in completion

Cases in which the actor believes the result has already occurred, while it actually follows from a subsequent act, are particularly instructive. The theoretical formula of “general intent” must not erase the need to establish the mental attitude toward each material act. An initial intention does not automatically make every subsequent act intentional causation of the same result.

Consider an analytical example: a person attacks with intent to cause death, mistakenly believes the victim is dead, and performs another act that actually causes death. It is necessary to establish the cause of death, the point at which the mistaken belief arose, and whether the later conduct continued the original execution or was an independent act accompanied by a different form of culpability.

Depending on the evidence, different constructions may be considered: a completed intentional offense involving an immaterial deviation; an attempt combined with subsequent negligent causation; or another classification where the elements of negligent liability are absent. The choice rests on the specific elements of the applicable offenses, not a general sense of the actor's blameworthiness. A classification adopted in advance cannot replace the necessary medical or technical reconstruction.

8. Proving mistake and guarding against hindsight presumptions

Mistake involves both facts and legal assessment. It may be established through the accused's explanations, conduct before and after the act, communications, documents, surrounding circumstances, and specialized opinions. The assertion “I did not know” is insufficient by itself, but the absence of a confession does not permit intent to be presumed. The right to remain silent is not evidence of awareness. [3]

The indictment and judicial reasons must identify what precisely the person understood. The formula “acted intentionally” does not resolve a dispute about knowledge of a particular status, an object's contents, or a factual prerequisite. Where the evidence permits materially different understandings on the actor's part, those possibilities must be examined rather than dismissed by invoking the gravity of the consequences.

Expert evidence may explain the capacity to perceive or the medical mechanism, but does not replace the court's conclusion concerning intent. The standard of proof under Article 303 of the Criminal Procedure Code also applies to the mental elements. Proven awareness must therefore be distinguished from an assumption about how someone in the defendant's position “should” have thought. [3]

9. Conclusion

Mistake of fact and deviation in the causal process are different grounds for examining culpable causation. The former concerns ignorance of facts constituting an offense; the latter concerns the relationship between the anticipated and actual mechanism producing the result. They share the principle that the objective result cannot substitute for proven culpability.

A reliable practical analysis proceeds through the precise offense, the relevant fact, the actual understanding, the causal mechanism, the form of culpability, and only then the final legal classification. This avoids both automatic acquittal for every asserted lack of knowledge and automatic attribution of every result somehow following initially blameworthy conduct.

Statutory sources and case law

  1. Criminal Code. Consolidated text in Lex.bg; the relevant provisions are identified in the discussion. Source check recorded in the original: September 14, 2026. Source text.
  2. Supreme Court of Cassation, General Assembly of the Criminal Division, Interpretative Decision No. 1 of June 7, 2016, in interpretative case No. 1/2016. Reasons addressing knowledge of an administrative penalty and Article 14(1) of the Criminal Code. Official text. Source text.
  3. Criminal Procedure Code. Consolidated text in Lex.bg. Source check recorded in the original: September 14, 2026. Source text.

This article is a general discussion of legal theory and practice. A specific matter requires consideration of the law applicable at the relevant time and Article 2 of the Criminal Code. Hypotheticals serve legal analysis only and do not describe actual cases.

Marian Georgiev Ivanov, Attorney-at-Law · Criminal law