Police handcuffed a black 18-year-old for allegedly robbing two white women, one of whom was his grandmother.
One of the officers told investigators he "didn't feel there was any other reasonable alternative."
Former South Carolina officer was found guilty of murder and obstruction of justice in 2015 shooting death.
The four-time MVP has spoken out about racism in America several times in the past.
The number of ER visits after police encounters were largely stable from 2006 to 2012.
Police corruption has been in focus since police officers were charged with kidnapping and murdering a Korean businessman.
The police allegedly sexually assaulted or raped 16 women in 2015.