Chicago police officers line up outside the District 1 central headquarters during a protest of the police shooting of 17-year-old Laquan McDonald. The shooting death became a rallying cry for activists calling for police reform. Paul Beaty/AP hide caption
In this Nov. 24, 2015, file photo, Chicago police officers line up outside the District 1 central headquarters in Chicago, during a protest for the fatal police shooting of 17-year-old Laquan McDonald. Paul Beaty/AP hide caption
A mural dedicated to Freddie Gray was painted near the location where he was arrested in Baltimore, Md. A judge has approved a court-enforceable consent decree to overhaul the city's police department, after an investigation prompted by Gray's death. Win McNamee/Getty Images hide caption
Attorney General Loretta Lynch (right), speaks during a joint news conference to announce the Baltimore Police Department's commitment to a sweeping overhaul of its practices under a court-enforceable agreement with the federal government on Thursday. Patrick Semansky/AP hide caption
People walk by a police car in downtown Newark, N.J., in May 2014. Spencer Platt/Getty Images hide caption
Ferguson City Council's acceptance of the consent decree means the city retains control of the police and courts, but also pays for an independent monitor to ensure the reforms are implemented. Scott Olson/Getty Images hide caption
Mayor James Knowles (center) and members of the Ferguson City Council listen to citizens speak during a council meeting Tuesday. Michael B. Thomas/AFP/Getty Images hide caption
Ferguson mayor James Knowles III, (second from left) speaks during a city council meeting on Feb. 2. The meeting was the first opportunity for residents to speak directly with city leaders about the preliminary consent agreement with the U.S. Department of Justice. Jeff Roberson/AP hide caption
Police officers are illuminated by patrol car lights during a protest against the acquittal of Michael Brelo on Saturday in Cleveland. John Minchillo/AP hide caption