This interesting piece in the New York Times claims that newly released data Shows an Increase in Street Stops. That alone is interesting, but here's the bit that gets me:
The 145,098 stops from January through March — up from 134,029 during the same quarter a year earlier — led to 8,711 arrests. That means that in 94 out of a 100 cases, the cops were harassing an innocent person. (Calls into question "reasonable suspicion" doesn't it?) And given that blacks are stopped in wildly disproportionate numbers it explains why there is such a sense of over policing in poor communities of color.