I believe it. I'm an old white guy, the cops never pay any attention to me, but my black friends have long talked of driving while black, which, they explained to me, is the frequent stops they get from cops. Yes, it's anecdotal, but given everything else I hear about the cops, and the fact that I know these friends well and trust them, I believe them. One more thing: these friends live in the SF bay area (one is a retired HP VP) and drive new-ish German cars.