In 1998, Washington voters approved the Medical Use of Marijuana Act (“MUMA”). MUMA provides a defense from criminal prosecution for physicians who prescribe medical marijuana and for patients who use prescribed medical marijuana. MUMA’s only reference to “employment” as the law was originally drafted, stated: “Nothing in this chapter requires any accommodation of any medical marijuana use in any place of employment . . . .” In 2007, the Washington legislature amended MUMA, clarifying that nothing in the law required “accommodation of any on-sitemedical use of marijuana in any place of employment . . . .” The legislature’s amendment opened the door to a claim that MUMA was intended to accommodate off-site use of medical marijuana that did not impact an employee’s job performance—or at least that was the argument heard recently by Washington’s Supreme Court.