Mens Rea Reform Act of 2024

This bill clarifies the mental state requirements prosecutors must prove in federal criminal cases. It establishes that for most serious offenses (those punishable by imprisonment or fines over $2,500), the government must prove beyond a reasonable doubt that a defendant acted "knowingly" or with a specified mental state for each element of the crime, unless the law already specifies otherwise. Exceptions apply for jurisdictional elements, venue rules, or if Supreme Court precedent requires a different standard. The law applies retroactively to cases starting after its enactment, unless it would punish innocent conduct or deny existing defenses. It does not change which acts are criminal but standardizes how mental state must be proven.