of patients to make medical decisions in consultation with their doctors. not with interference from their employers. >> reporter: with 14 states now approving medical marijuana use, this case could decide how much power states really have to protect marijuana patients like joseph. he said it gave him pain relief like no other drug could, on a tumor that affects his head, neck and back in pain. >> it means everything to me. it mean more than everything to me. more than anybody could ever realize. it is such a relief to not agonize all the time and try to deal with it. and try to deal with it and go on with your life. >> reporter: and now he is having to go on without a job. he is sikh back pay, compensation, and damages. walmart hasn't filed a response