The duress defense allows a defendant to argue that they should be excused from criminal liability because they acted under a coercive threat so severe that a person of reasonable firmness in the same situation could not have resisted. It is an excuse, not a justification: the act remains wrongful, but the law declines to punish the actor because their will was effectively overborne.
In international criminal law, the defense is codified in Article 31(1)(d) of the Rome Statute of the International Criminal Court (1998), which requires that the threat be of imminent death or continuing or imminent serious bodily harm, that the response be necessary and reasonable, and that the accused not intend to cause greater harm than the one sought to be avoided. The provision applies to acts that would otherwise constitute war crimes, crimes against humanity, or genocide.
A central controversy is whether duress can excuse the killing of innocents. In Prosecutor v. Erdemović (ICTY Appeals Chamber, 1997), the Tribunal held by a 3–2 majority that duress is not a complete defense to a charge of crimes against humanity or war crimes involving the killing of innocent human beings, though it may be considered in mitigation of sentence. The Rome Statute, drafted after Erdemović, took a more permissive approach, leaving room for duress even in homicide cases — a notable divergence between treaty law and ICTY jurisprudence.
Domestic systems vary widely. Common law jurisdictions traditionally bar duress as a defense to murder (see the English case R v. Howe, 1987). Civil law systems often treat coercion (contrainte morale) more flexibly. Across systems, courts typically require:
- An imminent threat
- Of death or serious harm
- To the accused or a third party
- With no reasonable means of escape
- A proportionate response
Duress is distinct from necessity (threats from circumstances rather than persons) and from superior orders, though the three frequently overlap in armed-conflict prosecutions.
Example
In Prosecutor v. Erdemović (1997), Dražen Erdemović, a Bosnian Serb Army soldier, argued he participated in the Srebrenica executions only because his commander threatened to kill him; the ICTY rejected duress as a complete defense but reduced his sentence.
Frequently asked questions
Article 31(1)(d) does not categorically exclude killing from the defense, provided the threat is imminent, the response is necessary and reasonable, and the accused does not intend to cause greater harm than that avoided.
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