Sibron v. New York

In one case, an officer who observed but never overheard Sibron (defendant) conversing with known drug addicts over eight hours stopped him, said 'you know what I'm after,' and when Sibron mumbled and reached into his pocket, the officer reached directly into Sibron's coat and found heroin; in the consolidated companion case, an officer who saw Peters fleeing a suspected burglary scene stopped and frisked him for weapons, discovering burglary tools instead. Both were convicted, New York's highest court upheld both convictions under the state's stop-and-frisk law, and the Supreme Court consolidated the cases to address their Fourth Amendment implications.