[JURIST] The Washington Supreme Court [official website] on Thursday ruled [opinion, PDF] that the state’s Medical Use of Marijuana Act (MUMA) [RCW 69.51A, text] does not prohibit private employers from firing an employee who fails a mandatory drug screening. The plaintiff, recorded as Jane Roe to protect her identity, argued that MUMA required her employer to exempt her from its drug test policy for legal medical use of marijuana outside the workplace. Since the original MUMA language explicitly protects employers…