Rosemond v. United States

Background

This case grew out of a drug sale that went wrong. A woman drove with two men to sell a pound of marijuana. One of the men was punched and the buyers ran off with the drugs. As they fled, someone in the car fired a semiautomatic handgun. The shooter’s identity was disputed. The Government charged one of the men, Justus Rosemond, with a federal law that punishes using or carrying a gun during a drug crime and also accused him of aiding and abetting that gun offense.

Reasoning

The Court focused on when the Government can hold an accomplice responsible for the combined crime of drugs plus a gun. The Justices said helping with the drug sale can count as the “act” part of aiding and abetting, but the Government must also prove the accomplice intended to help the whole gun-plus-drug crime. That intent, the Court explained, requires advance knowledge that a confederate would carry or use a firearm so the accomplice could choose to walk away. The trial judge’s instruction — which allowed conviction if the defendant merely “knew” a cohort used a gun without saying when he learned it — was wrong.

Real world impact

The Court vacated the conviction and sent the case back for more review. Going forward, prosecutors must show an accomplice both took part in the drug crime and had foreknowledge, at a time when he could act on it, that a partner would be armed. That ruling affects cases where a gun appears only during the crime and requires clearer jury instructions.

Dissents or concurrances

Justice Alito (joined in part by Justice Scalia) disagreed with requiring a “realistic opportunity” to back out, saying that rule shifts burdens and blurs defenses like necessity and duress.