Belief in Necessity

Belief in Necessity

The first requirement of Model Penal Code § 3.02(1) is belief in necessity, a state of mind. Conduct is justifiable when the actor "believes" it to be necessary to avoid a harm or evil to himself or to another, so the inquiry opens with what the actor actually thought and not with what the emergency objectively was.¹ That wording fits the premise from earlier in this chapter that a justification is a verdict on a choice, since belief is the part of the choice the statute names first. The protected interest may be the actor's own, as with Ken, who steals to save his life, or someone else's, as with the actor who burned the field to save the town. Nothing in the text asks whether the actor was related to the endangered person or stood to gain from the rescue. The reason is structural. The defense weighs the harm avoided against the harm the offense targets, and a life lost weighs the same whichever life it is.

The Comment to § 3.02 shows what the belief requirement excludes by using a druggist who sells a drug without a prescription. If the druggist does not know that the customer needs the drug at once to survive, the fact that the sale actually saved a life does not exculpate the druggist.² The druggist made no choice between harms. A routine sale happened to produce a good result, and the defense protects people who act in order to avoid the greater evil, which the unaware druggist was not doing. If coincidence could satisfy the defense, the law would be rewarding outcomes that no actor aimed at, and the defense would guide no one who is deciding whether to act. Requiring belief ties the justification to the actor's own purpose, which is the choice the law wants to encourage.

The word "necessary" also does work of its own. It is not enough that the actor believes the conduct may possibly help to ease some evil; the actor must believe the conduct is necessary to avoid it.³ Without that limit, any lawbreaker who hoped to do some good could invoke the defense, and the statute defining the offense would give way whenever someone could name a possible benefit. Belief in necessity describes a different actor, one who sees an evil coming and sees the offense as what stands in its way. What that demands in practice is taken up in the next section, so the discussion here stays with the belief itself.

The statute says believes, and it does not say reasonably believes.⁴ Many courts nonetheless describe the defense in terms of reasonable belief. An appellate court that rejected a necessity claim by people who trespassed at a nuclear power plant, fearing radiation and nuclear waste, required that the actor reasonably believe the chosen conduct was necessary to avoid the greater harm, and it added that the harm must be real and the conduct reasonably expected to help.⁵ That court framed these requirements as what a defendant must show to be entitled to an instruction on the defense, so the reasonableness language works as a screen applied before the jury ever hears about the defense.⁶ The two formulations produce different results. Under the Code, an honest belief satisfies the threshold, and carelessness in forming it is handled by § 3.02(2), which removes the justification only for offenses that recklessness or negligence suffices to establish.⁷ Under a reasonable-belief threshold, an unreasonable belief ends the defense for every offense. Students lose points here by treating an honest but unreasonable belief as a failure of the belief requirement under the Code, when the Code sends that problem to subsection (2); if the jurisdiction's own statute or cases say reasonable, that local formulation controls.

Variations on Medea, who burns down Jason's house as a firebreak to keep a spreading fire from the town, show where the belief requirement does and does not bite.⁸ Where Medea honestly and reasonably believes the burning is necessary but the fire dies out before it reaches Jason's house, she acted on the belief the text requires, and nothing about her appraisal was careless.⁹ Where her belief that the fire will reach the town is unreasonable, the belief is still hers, even though a strong wind she did not know of would have carried the fire there. The carelessness of her appraisal is then a question for § 3.02(2), whose effect turns on the offense charged.¹⁰ Where her honest belief proves entirely wrong and there was no need to burn the house, the belief threshold is met in the same way, because the text makes the actor's belief the trigger, and whether the careless-appraisal limit applies depends on how she came to hold it.¹¹ The last variation reverses the pattern. Medea sets the torch gleefully, intending only to burn, and the fire happens to serve as a firebreak that saves the town; her conduct produced the better outcome, but she never believed it necessary to avoid that harm, so she stands where the unaware druggist stands.¹²

Belief alone cannot carry the defense, because it is easy to claim after the fact and hard for a prosecutor to disprove. The Code therefore pairs it with checks that do not depend on what the actor says he thought. One is the requirement that the harm avoided actually be greater than the harm the offense targets, a question decided at trial rather than by the actor's private judgment.¹³ The other is the fault limit in § 3.02(2) for careless beliefs and for carelessly creating the emergency.¹⁴ Belief opens the door, and those later requirements decide whether the claimant gets through it. What remains open is what "necessary" demands in practice, since an actor who believes only that the offense was convenient, or that it might help, has not yet described a necessity, and the next section takes up how courts give that word content.