My question involves civil rights in the State of: Wisconsin
I just had the scariest encounter last night. It was about midnight I was coming home from work and decided to stop at a McDonald's after leaving the McDonald's there was an unmarked police car sitting in an empty parking lot with it's headlights on while the entire parking lot was pitch black. I saw the unmarked car and drove by and immediately after passing by him he pulls out of the parking lot and begins to follow me. I pulled out onto a 4 lane highway and continued to drive home. This entire time the unmarked police car is right behind me tailgating me and its raining pretty hard out and there are no other cars on the road. I take the highway and then get off and proceed down a smaller 2 lane road and the officer is still right on my tail. I turn into my subdivision and not to my surprise, he follows me in. I'm now driving through my subdivision thinking what the heck is he following me for. I eventually reach my house and pull into the driveway with the officer right behind he stops right in front of my driveway. Outraged I get out of my car and throw my hands in the air and as soon as I got out he slowly begins making a u-turn. Once he gets fully turned around he drives away very slowly, I think he was watching me walk into my house. At the time I didn't think of recording the officer but I wish I had because I would have checked to see whether it was a legit officer or not. The entire trip home took me anywhere from 5-10 minutes and the officer followed me the entire time and watched me walk into my house. I have not committed a crime in my life and that night I had made no traffic violations. I'm thinking why in the world would a police officer do this? Keep in mind it was midnight and I was followed home by an "Unmarked" police car and the roads were nearly empty. Should I be worried? Any ideas?

