This is, of course, a rhetorical question:
An ex-boyfriend wants to know the identity of all visitors at his ex-girlfriend's house. He is watching in his car from down the street. He gives license plate info of ex-girlfriend's visitors to a FW police officer neighbor/friend. The policeman runs an ID on them and provides the name, address, etc. to the ex-boyfriend. Is this legal/ethical/allowed? If not, how to put a stop to it?