A “reasonable suspicion” of criminal activity justifies police stops, or a person’s temporary detention by the police. But once police detain a person, California criminal law says that the police can only legally frisk that party if they believe the person is: armed, and presently dangerous. Moreover, peace officers can only conduct the frisk to search for dangerous weapons that the detainee could use against the officers. For example, an officer cannot conduct a frisk to look for contraband or other evidence of a crime.