Staples v. United States

Supreme Court of the United States · 1994 · Criminal Law

511 U.S. 600 (1994)

Updated August 1, 2026

Criminal Lawmens reastrict liabilitypublic welfare offenseNational Firearms Actmachinegunknowledge of characteristicsstatutory interpretation

Facts

Police and federal agents executing a search warrant at petitioner's home recovered an AR-15 rifle. The rifle had been altered with M-16 parts, including a selector switch and internal parts, and BATF testing showed it fired more than one shot with a single pull of the trigger. The weapon was not registered, and petitioner was indicted under § 5861(d) for possessing an unregistered machinegun. Petitioner testified that the rifle had never fired automatically while in his possession and requested a jury instruction requiring proof that he knew the gun would fire fully automatically, but the trial court refused and gave a lesser knowledge instruction.

Issue

Does 26 U.S.C. § 5861(d), which criminalizes possession of an unregistered firearm, require the Government to prove that the defendant knew of the characteristics of his weapon that made it a machinegun and therefore a statutory firearm under the Act?

Rule

Absent a clear indication that Congress intended to dispense with mens rea, courts presume a defendant must know the facts that make his conduct illegal. For a prosecution under 26 U.S.C. § 5861(d) based on possession of a machinegun, the Government must prove the defendant knew of the features of the weapon that brought it within the Act's definition of a firearm.

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One of 10 multiple-choice questions for this case. Pick an answer to see why.

In Tulsa, Nora Bennett bought a used semiautomatic rifle from a neighbor and locked it in a closet for three years without firing it. After a burglary investigation, officers seized the rifle and federal testing showed worn internal parts caused it to fire multiple rounds with one trigger pull; the rifle was not registered.

If Nora is prosecuted for possessing an unregistered statutory firearm, what must the government prove to obtain a conviction?

Explanation. The majority held that when § 5861(d) is applied to a machinegun, the government must prove the defendant knew the features of the weapon that brought it within the Act's definition of a firearm. The statute does not require proof that the defendant knew the gun was unregistered, but it does require knowledge of the weapon characteristics making it a statutory firearm.