They have these all Over the highway in Indiana. (moved from there 3 years ago, still go back about every week for business). No markings on the car at all. Usually Mustangs, chargers, etc. Light bars in the window and grill. Can't remember if they had civilian plates, but want to say they were state patrol plates. My understanding is that they HAD to be in uniform to Make a traffic stop. It made The news on more than one occasion due to the concern of a fake stop. Again, this is in Indiana, the state that now says it's ok for popo to enter your house without a warrant. Sent from my iPhone using Tapatalk