I was driving to the Kwik Trip last night from my house only a couple blocks away I made a left on to West Ave I changed lanes from left to right I passed a police car that was waiting opposite me at the intersection, So I looked back like everyone does when they pass a cop car and the car was turning behind me I took a glance back at the road and red and blue lights started to light up the inside of my car. I pulled over to the side of the road hoping there was a chance that the cop would pass by but he stopped behind me. Next thing i know there's a spotlight aimed at my car and the cop gets out and walks over to the window and explains that he saw me change lanes in the intersection back there and if there was any reason for that, I said that Kwik Trip was on the right side of the road that's why. Then the next thing he says is "Have you had anything to drink today?", and I didn't so I said no, He went on to say he could smell something and asked me for my licence and if this was my car, and then walked back and got in his car. After 5 or 10 min another cop car pulls up and the cop comes back and tells me to get out of the car and come to the sidewalk. He pulls out a green light and tells me to follow it with my eyes without moving my head after I passed that with flying colors I thought I would be on my way. The next thing he had in his arsenal was making me walk a whole 9 steps forward and then backward, I thought maybe now it would be done. I thought wrong the next thing I had to do was stand on one leg for a whole 30 seconds. I do all of these tasks with no problem but hes still not satisfied, then I had to blow into a breathalyzer which of course came out 0.00. He tells me to get back in the car and I overhear him say something to the other cop about "something is weird about this guy" or something along those lines then he gets back in his car and after another 5 or 10 minutes he comes back and hands me a warning for a traffic violation and walks away.