"Michigan Men Face Charges in Diesel Engine Tampering Case"

11 individuals and three companies in Michigan have been charged with violating the Clean Air Act by tampering with diesel engines to evade emission controls on semitrucks. The companies and individuals allegedly violated the federal Clean Air Act, which regulates mobile pollution sources. The case is one of the largest of its kind ever charged in the United States. The charges follow a nationwide EPA crackdown on aftermarket efforts to bypass emissions controls.