Creates a new federal crime for knowingly assaulting a law enforcement officer that causes serious bodily injury (or attempting to do so). Penalties can be up to 10 years in prison for the basic offense, and substantially higher penalties — including life imprisonment — if the assault results in death, involves kidnapping, or includes an attempt to kill. The offense is made federal when linked to specified interstate‑or‑commerce circumstances, and the Attorney General (or a designee) must provide written certification before the United States may prosecute under this law. The text also defines key terms such as “law enforcement officer” and “State.”