Chicago writer Jamie Kalven focuses on patterns of police abuse and impunity in Chicago. He heard about an attempted cover-up of the details in the fatal shooting of a 17-year-old wielding a knife.  Officer Jason Van Dyke, who is white, shot Laquan McDonald, a black youth, 16 times in 14 seconds.

Laquan McDonald was shot 16 times after allegedly refusing to follow officers' instructions as he walked down a street with a knife in October 2014. The officer who shot him was charged Tuesday with murder.