When U.S. Attorney General Eric Holder announced last year that the federal Department of Justice would no longer prosecute medical marijuana patients and providers complying with state law, reform advocates cheered it as the greatest victory in over a decade. The shift in federal policy was indeed a breakthrough for the medical marijuana movement, but did little good for Bryan Epis of Chico, California. Last week, a federal judge ordered Bryan to prison for a 2002 conviction involving 100 marijuana…