I've had a number of run ins with the law in my younger years. Most of them were for speeding and fender benders, got to the point I nearly lost my license (And probably should have). All the officers I've ever dealt with have been super cool and understanding, save for one. I've lived my whole life in suburbia though, and I'm white, so I've been fortunate to get the nice treatment.
That one guy that was a prick was a well known prick in my old hometown. Pulled me over when I was 16, I was neckin' with a girl in my car in the back of her subdivision. He could tell I was scared shitless, he started making a lot of threats. He kept making accusations that we were trying to steal construction equipment and other goods from the nearby lots being built. What the fuck is a 16 year old going to do with construction equipment? Do I have a backhoe in my trunk? He wanted to search the vehicle, wanted to administer a breathalyzer, pulled my gf aside to confirm she was there of her own free will, then planned on calling her father until she pleaded with him to let us off with a warning and we wouldn't be back. We weren't even fuckin', we were just makin' out. This guy had nothing. Things didn't get physical or anything, but the guy was well known for his abuse, he enjoyed the power trip.
I can think of at least 10 run ins I had on the road where I did get a ticket though, and several more where the officer let me go. All those guys were cool. There was even an incident recently where my red headed son decided to swipe a $1 toy from the store. I thought I'd stage a mini-intervention to curb future sticky hands in the future, so I took him down to the station to have a talk with with the police. The officer that talked to him was awesome, very kind and really got through to my little shit head. We then submitted the toy as "evidence," but not before we went to the store and I made him pay the cashier for it.