Dean v. United States, 556 U.S. 568 (2009), was a decision by the United States Supreme Court upholding a 10-year penalty for the discharge of a firearm during the commission of any violent or drug trafficking crime, against a bank robber whose gun went off accidentally.

The gun discharged, leaving a bullet hole in the partition between two stations.

Dean and an accomplice were later caught and charged with conspiracy to commit a robbery affecting interstate commerce, in violation of 18 U.S.C.

§1951(a), and aiding and abetting each other in using, carrying, possessing, and discharging a firearm during an armed robbery, in violation of §924(c)(1)(A)(iii) and §2.

In a 7 to 2 decision delivered by Justice Roberts, the Supreme Court held that Section 924(c)(1)(A)(iii) required no separate proof of intent.