In a major win for medical cannabis patients in Arizona, the state’s Supreme Court ruled Wednesday that public college students with medical cards cannot face criminal charges for possessing or using marijuana on campus. The court ruled against a 2012 law that banned cannabis on public higher education institutions, finding it unconstitutional and a violation of voters’ intent. The court’s ruling also vacated the cannabis possession charge of the student who fought the law—and won.

How One Student Fought To Allow Medical Cannabis at College

Arizona voters approved the state’s medical marijuana program in 2010. Originally, the law placed prohibitions on having and using cannabis on preschool and elementary school campuses, school buses and prisons. But the law did not restrict medical cannabis on college and university campuses.

Arizona has a Voter Protection Act, which means lawmakers can’t pass laws that overturn or restrict anything voters approved. Instead, they can only pass legislation that “furthers the intent” of the measure voters passed.

So when Arizona passed a law in 2012 that banned medical cannabis use at institutes of higher learning, it violated the Voter Protection Act. The ban, in other words, did not further the intent of the law, since voters did not intend to ban medical cannabis on campus.

That’s exactly the argument Andre Maestas used to vacate his 2014 criminal charge for marijuana possession when he was a student at ASU. In 2014, ASU police arrested Maestas for having just 0.4 grams of cannabis in his dorm room.

The state’s medical cannabis program permits cardholders to possess up to 2.5 ounces at a time. But Maestas was charged with a class 6 felony for possession.

Prosecutors ultimately reduced the charge to a misdemeanor and tried

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