I'm not worthy. This is a genius way of handling a cold call. If you can convince the caller you are the cops they will be to afraid to get off the call.
Mike the call center guy phones up in the middle of a crime scene investigation and gets a grilling from the homicide cop. He's kept on the line until the cop starts getting weird about vegas and midgets.
I wish I had thought of this one myself. Of course impersonating a police officer is a crime. Keep em peeled.