Which standard, part of the Model Penal Code, requires lack of either the ability to understand right from wrong or to control behavior?

• A. Duress
• B. Void for vagueness
• C. Substantial capacity test
• D. Entrapment

Answer: (C)

The Model Penal Code uses a substantial capacity standard for insanity. It asks whether, due to a mental disease or defect, the defendant lacked substantial capacity to either understand the wrongfulness of their conduct or to conform their conduct to the law. If that lack of substantial capacity existed, the person may be found not responsible by reason of insanity. This differs from duress (crime committed under threat), void for vagueness (a constitutional challenge to unclear statutes), and entrapment (government induces the crime).