sentencing. I've also witnessed it first hand.
Here's just one-
“evidence of a significant bias in the killing of unarmed black Americans relative to unarmed white Americans, in that the probability of being black, unarmed, and shot by police is about 3.49 times the probability of being white, unarmed, and shot by police on average.”
http://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0141854
The problem exists and is keenly felt in some communities, even if the protest examples have been bad.