Police Informants are a proven myth in Grand Theft Auto: Vice City.
Description[]
Police Informants are random pedestrians who give information to police in the middle of the street. At first, the police and a random pedestrian walk around for a while in the same area, then they very quickly meet up and exchange a few words about criminals. They soon disappear from that area.
This is how most people tip off the police if they don't want to risk being seen going to the police station and talking to them. The Police Informants are said to be governed at the Washington Beach Police Station. They are also said to be involved with the Enforcement Nexus.