Justin Rashaad Brown, Petitioner v. United States

The Supreme Court ruled that a state drug conviction qualifies as a "serious drug offense" under the Armed Career Criminal Act (ACCA) if the drug was federally controlled at the time of the state conviction, even if it was later removed from federal schedules. The Court determined that ACCA requires a backward-looking approach to assess a defendant's prior criminal history based on the law in effect when the previous crimes were committed.