• In this Oct. 6, 2015, file photo, former Police Supt. Garry McCarthy and Mayor Rahm Emanuel speak in the City Council chambers in Chicago. For more than a year after officer Jason Van Dyke shot and killed Laquan McDonald, the Chicago Police Department had video footage and autopsy results that raised serious questions about whether other officers on the scene tried in their reports to cover up what prosecutors now contend was murder. The lack of swift action against the officers illustrates the difficulty of confronting the “code of silence” that has long been associated with police in Chicago and elsewhere. (Rich Hein/Sun-Times via AP File) MANDATORY CREDIT, MAGS OUT, NO SALES, CHICAGO TRIBUNE OUT

    Police at scene of black teen’s shooting falsified reports

    CHICAGO (AP) — For more than a year after an officer shot and killed a black teen named Laquan McDonald, the Chicago Police Department had video footage that raised serious doubts about whether other officers at the scene tried in their reports to cover up what prosecutors now contend was murder.