Mens Rea Reform Act of 2025

This bill establishes a default rule for federal criminal prosecutions: prosecutors must prove beyond reasonable doubt that defendants knowingly acted unlawfully for most offenses. It applies to all federal crimes punishable by imprisonment or a $2,500+ fine (excluding certain military offenses and jurisdictional elements), requiring proof of awareness of unlawfulness unless the law specifies a different mental state. The rule affects nearly all federal criminal defendants by clarifying that "knowingly" is the default standard for unaddressed elements of a crime. The law applies to cases filed after its enactment, with limited exceptions for retroactive application to prior cases.