Mass Shooter Prosecution Act of 2023

The Mass Shooter Prosecution Act of 2023 creates a new federal crime for killing three or more people in a single incident using a machinegun or a "covered semiautomatic weapon" (defined as rifles with pistol grips or folding stocks, AR/AK-style weapons, certain shotguns, or other weapons meeting specific features). The law applies when the offense involves interstate commerce, such as transporting weapons across state lines or using facilities like mail systems. It requires the Attorney General to annually report to Congress on cases filed under this law, including victim counts, accused demographics, and weapons used. This bill establishes a federal prosecution path for qualifying mass shootings without changing existing state laws.