Today a federal judge in Michigan will begin hearing arguments in a lawsuit filed on behalf of Joseph Casias, the legal medical marijuana patient who was wrongfully terminated by a Battle Creek Wal-Mart because he tested positive for marijuana during a drug screen. Casias, 30, is a husband, father of two, and 2008 store Associate of the Year, who suffers from an inoperable brain tumor and sinus cancer that is now in remission. His outrageous firing last year for using a state-legal, doctor-approved…