Search and Seizure | Facts; A revolver was introduced as evidence at the trial of John W. Terry for carrying a concealed weapon unlawfully (after failure of a pretrial motion to suppress). A police officer had observed unusual conduct by Terry and two other men, and--concluding that they were contemplating a robbery--he stopped and frisked them, discovering the weapon carried by Terry and seizing it. | Issue: Is the police stop-and-frisk procedure constitutional? | Decision: The police stop-and-frisk procedure does not violate the Fourth Amendment rights of Terry (under the circumstances of the case), and the revolver seized from Terry was property admissible at his trial for carrying a concealed weapon unlawfully.