Been stopped at least 3 times in VA, where they just stop every car going by. Just to check you out. Never a reason, not even a DUI checkpoint. Totally illegal.
One was a rainy night, multi lane divided highway with crossovers. I was below speed limit, saw police car lights on other side, slowed down some more. Almost ran into a trooper who walked out in front of my car in a black rain suit. But he was holding up a red flashlight that you couldn’t even see since it was dark, but the police car lights were blinding. What an idiot. Just one of their random stops.