This story is not new.
On March 6, Matthew Kenny, a police officer in Madison, Wis., shot and killed an unarmed 19-year-old black man named Anthony Robinson Jr., who, he said, had attacked him. The shooting triggered days of peaceful protests. An autopsy found a cocktail of illicit drugs in Robinson's system. Earlier this month, Dane County District Attorney Ismael Ozanne, who is black, cleared Kenny of wrongdoing.