Dad ordered a new 1970 Fury III with a 440. Virginia State police used them and first thing Dad did was made a fake radar gun for it. Back then it looked like a 3" pipe about a foot long hung from drivers window.
I used to borrow the car pulling friends over at night with flashers.

Dad said he was driving on a 4 lane somewhere when a real State trooper pulled alongside him, Dad said he looked down and he was doing 85mph!
Dad had on a suit & didn't get a ticket. Trooper must have thought he was a detective, gave Dad a thumbs up then went out of sight.