A black Milwaukee driver is seven times as likely to be stopped by city police as a white resident driver, a Journal Sentinel analysis of nearly 46,000 traffic stops has found.
...
Police also searched black drivers at twice the rate of whites, but those searches didn't lead to higher rates of seized weapons, drugs or stolen property.
The important and I think mostly missed point is that even tiny amounts of racial bias sprinkled throughout the structure of the system can lead to rather large impacts on life outcomes. Not that it's always tiny, of course.