It only works if it is tied into a computerized dispatching system. So that when a call comes in about a disturbance at 14 Mulberry Street it automatically flashes up on both the dispatchers computer screen and in the police cruiser(s) as well the information that a mentally ill person lives there or next door. Likewise if it is somehow tied into records checks a Constable "runs" Robert Wombat and it pops up the information that he has a diagnosis of paranoia.