I had something similar happen to me once. I was getting onto RT3 from 128 I was like 18 years old, driving my firebird. I took the on ramp at my usual 70MPH. About 1/2 mile onto RT3 I see blues behind me, so I slow down to let the poor sucker catch up, and pull over once he got behind me. I was thinking shit an unmarked car, but when the "cop" got to the window he was in plain clothes and start to yell at me, telling me he should drag my hippie ass out of the car and beat the shit out of me. I said something to the effect of "whoa there smokey, let me see your badge" He started yelling at me telling me he didn't have to show me ANYTHING, so I told him if he didn't I was going to leave. He quickly flashed me some badge, and I told him to show me again and SLOWER this time. When he did, I saw that it said Constable on it. I said, "WHAT?! You're a f***ing process server not a cop, leave me the hell alone" and just took off leaving him standing on the side of the highway, in a cloud of tire smoke!