(January 5, 2016, 1:18 PM EST) -- DETROIT — The federal government sued Volkswagen AG and its subsidiaries in federal court in Michigan on Jan. 4, claiming that the manufacturer violated the Clean Air Act (CAA) by installing software in its vehicles that was designed to cheat emissions tests (United States of America v. Volkswagen AG, et al., No. 16-cv-10006, E.D. Mich.)....