It always amazes me when people masquerade as entities that they aren't. A couple of days ago in my neck of the woods, a cop in an unmarked truck with police cherries pulled over a vehicle. Turns out the cop in the truck wasn't really a cop, but the man he pulled over was...in an unmarked vehicle. LOL.
http://www.northescambia.com/2015/10/cop-impersonator-arrested-after-trying-to-pull-over-unmarked-deputy-vehicle
Turns out there were two.
http://www.northescambia.com/2015/10/second-alleged-police-impersonator-arrested