Which is NOT a listed defense?

• A. Insanity
• B. Voluntary intoxication
• C. Mistake
• D. Necessity

Answer: (D)

Defenses to criminal liability fall into two broad groups: excuses and justifications. The items listed are classic excuses that negate liability by showing the defendant lacked the required mental state or awareness—insanity negates the ability to form the requisite mens rea, voluntary intoxication can defeat intent in some crimes, and a mistake of fact can excuse if it negates the mental state needed for the offense. Necessity, on the other hand, is a justification defense: it argues that the conduct was legally permissible because it was necessary to prevent a greater imminent harm. In the context of this question, the listed defenses are the excuse-type defenses, while necessity is treated as a separate justification defense and thus isn’t part of that listed set. That’s why necessity is the correct choice for “NOT a listed defense.” Keep in mind that some jurisdictions do recognize necessity in specific situations, but it isn’t included in the particular list being tested.