It may be off the main topic, but keep in mind, in general sometimes cops, PIs, process servers, federal agents, etc may be watching a property or waiting to talk to someone.
If the ignition is on & they have tints, the AC may be on. I knew a off-duty sheriff's deputy who would sit in his take home vehicle with the engine on all thru his security job.
I've run afoul of many "working shulbs" who were harmless or doing a LE detail.
I've also called in "bait cars" & "auto theft" vehicles much to the ire of the PD.
