A jar of medical marijuana sits at a Western Oregon Dispensary in Sherwood, Oregon [Gillian Flaccus/AP]

Colleges in the United States are becoming a battleground in the conflict between federal and state cannabis laws as students who use medical cannabis challenge decades-old campus drug policies.

In states where medical cannabis is legal, students disciplined for using it are taking their schools to court. College officials argue they could lose federal funding for failing to follow federal law that labels cannabis an illegal drug with no accepted medical use.

Sheida Assar said she was expelled from GateWay Community College in Phoenix last month for violating the school’s drug policy after she tested positive for cannabis, which she uses to treat chronic pain from polycystic

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