SC trooper pleads guilty in shooting of unarmed black man. How common?

-CHRISTIAN SCIENCE MONITOR, 14 MARCH 2016, FEAT. PROF. KENNETH GAINES: 

A state trooper in South Carolina pleaded guilty Monday to charges relating to the 2014 shooting of unarmed black man after a traffic stop.

Levar Jones was walking into a convenience store in September 2014 when Trooper Sean Groubert pulled up to him without his sirens on. The trooper got out of his car and asked Mr. Jones for his license. As Jones turned back to his car, Mr. Groubert shouted, “Get outta the car, get outta the car,” and fires four shots in about three seconds.

The whole incident was captured on dash-cam video. Leroy Smith, the state public safety director and Groubert’s boss, fired him after seeing the video. <Read More>