Under Model Penal Code 2.09, duress is an affirmative defense that excuses a crime when the defendant was coerced by unlawful force, or the threat of it, that a person of reasonable firmness in the same situation could not have resisted. The force can be aimed at the defendant or at someone else. The threat does not have to be imminent, and the Code does not carve out any offense, including homicide, from the defense’s reach.1Open Casebook. MPC 2.09 Duress
What a Defendant Must Show
Section 2.09(1) sets three elements. The defendant was coerced by unlawful force or by a threat to use unlawful force. The force was directed at the defendant or at another person. And a person of reasonable firmness in the defendant’s situation would have been unable to resist.1Open Casebook. MPC 2.09 Duress All three have to be present. A threat against the defendant’s child counts as readily as a threat against the defendant.
“Unlawful force” is a defined term under Section 3.11. It means force (including physical restraint) used without consent, where using that force would itself be a crime or the basis for a civil action.2University of San Diego. Model Penal Code That definition rules out a lot of pressure that feels coercive in ordinary speech. Economic threats, blackmail, and reputational harm are not enough. The coercion has to involve physical violence or confinement. Someone who robs a store because a loan shark threatened their credit rating has no claim under 2.09. Someone who robs the same store with a gun at their back likely does.
The Reasonable Firmness Standard
The test at the center of the defense is objective. The jury asks whether a person of reasonable firmness, placed in the defendant’s situation, would have given in to the same pressure. The question is not whether this particular defendant felt they had no choice. It is whether an ordinary person with normal courage would have broken.1Open Casebook. MPC 2.09 Duress
The word “situation” is where the test gets interpreted. The MPC Commentaries say the jury should factor in “stark, tangible” characteristics of the defendant: physical size, strength, age, health. The jury should not factor in temperament. A defendant cannot argue that an anxious personality made the pressure feel worse.3Inter Droit et Affaires. An Introduction to the Model Penal Code A frail 70-year-old facing armed assailants is measured against a hypothetical reasonable-firmness person who is also a frail 70-year-old. A generally fearful person facing a modest threat does not get the benefit of that fearfulness.
In practice, that means courts weigh the external features of the threat (how many aggressors, what kind of weapon, how close the danger, how serious the threatened harm) while asking whether an average person sharing the defendant’s physical reality could have refused.
When Prior Fault Kills the Defense
Section 2.09(2) takes the defense away from defendants who are responsible for ending up in the coercive situation to begin with. The rule tracks the mental state required for the underlying offense.
If the defendant recklessly placed themselves in a situation where it was probable they would be subjected to coercion, the duress defense is unavailable. Joining a violent criminal organization while aware that members routinely get pressured into carrying out crimes is the standard example. If the underlying offense only requires negligence, the defense is also barred when the defendant was negligent in placing themselves in the coercive situation.1Open Casebook. MPC 2.09 Duress
Most duress claims collapse here. Prosecutors argue that the defendant’s own choices created the circumstances, and juries often agree. The embedded principle is simple: you cannot walk voluntarily into a dangerous situation and then invoke duress when the foreseeable danger arrives.
Section 2.09(3) closes off another path. The common law presumed that a wife who committed a crime in her husband’s presence was acting under his coercion, which effectively handed married women an automatic defense in certain cases. The MPC abolishes that presumption.1Open Casebook. MPC 2.09 Duress A married defendant must prove actual unlawful force or a threat of it, like anyone else. Following a spouse’s orders, without a threat behind them, does not qualify.
How MPC Duress Differs from Common-Law Duress
Two departures from the traditional doctrine matter most.
Common law generally requires the threat to be imminent: the danger has to be here and now. Section 2.09(1) drops that requirement. The provision speaks of a threat “to use” unlawful force, with no imminence qualifier. A threat that is not seconds away can still support the defense, so long as the reasonable-firmness standard is met.1Open Casebook. MPC 2.09 Duress The objective test does the limiting work that imminence does at common law; remote or vague threats will fail reasonable firmness without a separate imminence rule.
Common law also treats duress as categorically unavailable for murder. If someone forces you to kill, traditional doctrine blocks the defense regardless of the pressure. Section 2.09 contains no offense-specific exclusion. The defense is available for any charge, homicide included, as long as the reasonable-firmness standard is satisfied. This is among the Code’s most contested positions, and many states that otherwise follow the MPC have not adopted it.
Duress Is Not Necessity
Duress under 2.09 is routinely confused with the “choice of evils” defense in Section 3.02, but they handle different situations. The easiest way to keep them apart is to look at the source of the pressure. Duress involves a human being coercing you into a crime. Necessity involves circumstances no one controls, like a natural disaster or a medical emergency, where breaking the law is the lesser evil.
The two defenses also differ in character. Duress is an excuse: the defendant concedes the conduct was wrong but argues the coercion removes blame. Necessity is a justification: the defendant argues the conduct was the right choice under the circumstances. That distinction can affect how a jury weighs the evidence and, in some jurisdictions, whether third parties who assisted the defendant also have a defense.
Check Your State’s Version
No state has adopted the Model Penal Code wholesale, and 2.09 is no exception. Many states track the general structure (unlawful force, objective reasonableness, prior-fault bar) while varying on the specifics. The common departure is keeping the common-law rule that duress cannot be raised against a murder charge, even in states that otherwise mirror the MPC. Some states also reimpose an imminence requirement that 2.09 omits. Anyone facing a real duress question has to read their own state’s statute, because the local version may differ from the model in ways that decide the case.