Physics
The Necessity Defense in Criminal Law for Emergency Actions
Quick fact
In 2022, a Nebraska man charged with smashing a car window to rescue a dog on a hot day was cleared using the necessity defense—a classic example of breaking one law to prevent a greater harm.
Why this is interesting
Imagine you are lost in a blizzard and break into a mountain cabin to survive. Should you be punished for trespassing? The law has an answer—and it is not what you might expect.
Read the full explanation
Understanding The Necessity Defense in Criminal Law for Emergency Actions
The necessity defense acknowledges that sometimes, following the law would result in an even worse outcome. It applies when a person commits a crime to avoid an imminent and greater harm, with no reasonable legal alternative available. For instance, breaking a window to save a child from a burning car is destroying property, but the harm avoided—serious injury or death—far outweighs the damage. This isn't an excuse for lawbreaking; it's a justification that makes the act legally acceptable. The key elements are: a clear and imminent danger, the action taken was necessary to prevent that danger, and the harm caused is less than the harm avoided.
A deeper explanation
The necessity defense rests on the principle of 'choice of evils': when faced with two harms, the law permits choosing the lesser. Its boundaries are precise. The threat must be imminent—not speculative or remote. The harm to be avoided must be greater than the harm caused, requiring a proportionality evaluation. Critically, there must be no adequate legal alternative; if a reasonable person could have taken a lawful route, the defense fails. Also, the defendant cannot have intentionally created the emergency. Under the Model Penal Code, this defense is codified and applied broadly, but jurisdictions differ on when it applies—some limit it to natural forces, excluding human threats (which fall under duress). The defense does not apply when the legislature has already weighed the conflicting values, as in cases of civil disobedience. Thus, necessity is a narrow safety valve for extraordinary circumstances, not a general excuse for breaking the law.