On the way back at night, driving through a small town in central Massachusetts, I passed a cop car, going at the speed limit. The cop immediately pulled out and began tailing me, but did not turn on his lights.
I tried to maintain a constant speed, a couple miles above the 35 mile per hour speed limit, since I know cops treat excessively slow speeds as an indicator of drunk driving.
Eventually, after 15 minutes of being tailed, I hit my foot a bit too heavily on the gas, and went to 45 miles per hour. He instantly turned on his lights, and pulled me over.
The officer was extremely skeptical when he got to the car, especially since the name on the car's registration was my company's, not mine, and I had two minors in the back. After some questioning and prodding about where we had been and what we had been doing, he let me go with a warning.
I shudder to think what would have happened if I had pulled over in the same situation, but black. The officer was serving no sort of duty except to troll for problems where none existed.
I haven't returned to the US since: it turns out there are many places I can live where I don't have to have nerve-wracking interactions with hostile law enforcement, ever.