Police officers in various jurisdictions have power to search members of the public, for example, for weapons, drugs and stolen property.
[1] Police powers in England and Wales, allowing police officers to search members of the public for weapons, drugs, stolen property, terrorism-related evidence or evidence of other crimes are known as stop and search powers.
[2] Searches in the United States are governed by the Fourth Amendment to the U.S. Constitution, which generally requires that the police obtain a warrant before a search is legally permissible.
After stopping a person based upon the reasonable belief that the person might be engaged in unlawful activity, or following a routine encounter such as a traffic stop, the police in the United States may perform a cursory search of the persons outer clothing for their own safety.
[4] When performing a pat-down following a Terry stop that results in the officer identifying a weapon by feel, a police officer is allowed to remove the weapon from the person's clothing.