The mistake-of-fact defense, where an honest belief can negate the required intent, is known as which defense?

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The key idea is that many crimes require a specific mental state, or intent. If you genuinely believe a fact that would negate that required intent, you may not have the mens rea the offense demands. That’s why the defense is labeled as mistake of fact: it asserts that an honest belief about a material fact can excuse the conduct because it removes the fault element. For example, if you take property believing it’s yours, your honest belief may negate the intent to steal. This defense targets the factual belief behind the act, not the law or your capacity to understand it. By contrast, insanity concerns mental illness, duress involves being forced to commit a crime, and mistake of law is generally not a defense since ignorance of the law is not an excuse.