I have met a lot of cops. Loads of them are raciest and loads of them are just profilers but the common this is they enjoy the power and they enjoy getting big busts. So if your riding a Impala with rims or if your driving a car with a tail light out expect to get stopped and harassed. Just the way it work. Also the best defense is to be polite and let them know you will see them in court on there BS. If they think you will kick there ass there then most of the time they will leave you alone.
Sad it has to be this way, but this is so true. I used to drive an impala, and put some 22" rims on there. Got hassled and pulled over so much based on "suspicion", that I just said f it and took them off. They weren't worth the constant harassment.
Also, its true about being polite. It's amazing what a simple "yes sir" will get you with some of these cops lol.