Sources have told the Chicago Tribune that Ferguson’s office obtained video footage showing Johnson drinking for a few hours on the evening of Oct. 16 with a woman who was not his wife at the Ceres Cafe, a popular restaurant and bar at the Chicago Board of Trade building. Later that night, when officers responded to a 911 call near Johnson’s home, Johnson rolled down the window on his police vehicle partway, flashed his identification and drove off, the sources said.