facts germane to the issue to which the poster is referring; it's titled "An Empirical Analysis of Racial Differences in Police Use of Force":

http://www.nber.org/papers/w22399

"This paper explores racial differences in police use of force. On non-lethal uses of force, blacks and Hispanics are more than fifty percent more likely to experience some form of force in interactions with police. Adding controls that account for important context and civilian behavior reduces, but cannot fully explain, these disparities."

And from an article summarizing the results of the study:

"A new study confirms that black men and women are treated differently in the hands of law enforcement. They are more likely to be touched, handcuffed, pushed to the ground or pepper-sprayed by a police officer, even after accounting for how, where and when they encounter the police...

"...excessive use of lesser force is rarely tracked or punished. 'No officer has ever told me that putting their hands on inner-city youth is a life-changing event,' he said.

"For Mr. Fryer, who has spent much of his career studying ways society can close the racial achievement gap, the failure to punish excessive everyday force is an important contributor to young black disillusionment.

''Who the [yewt] wants to have a police officer put their hand on them or yell and scream at them? It's an awful experience,' he said. 'Every black man I know has had this experience. Every one of them. It is hard to believe that the world is your oyster if the police can rough you up without punishment. And when I talked to minority youth, almost every single one of them mentions lower-level uses of force as the reason why they believe the world is corrupt.'"

http://www.nytimes.com/2016/07/12/upshot/surprising-new-evidence-shows-bias-in-police-use-of-force-but-not-in-shootings.html?_r=2