[Gabe DV]

In order to take actions to ensure his safety, such as ask to see someone's hands or pat them down, you need to have a reasonable suspicion that they are involved in criminal activity---specific and articulable facts. Walking on the street is certainly not enough, and even if there was a complaint, unless it was specific with a description, the alleged illegal activity being engaged in, and independantly corroborated by the police officer's observations, the officer would have no right to see his hands. of course, this applies in the United States, and not a foreign jurisdiction.