In Casias V

In Casias v.Wal-Mart Stores,plaintiff Casias,a cancer patient and Wal-Mart employee,was prescribed medical marijuana for his symptoms by his physician,pursuant to the state's new medical marijuana law.Upon being injured at work,he was given a blood test which showed marijuana in his system.He was fired,and sued for wrongful termination.The court ruled:

A) for the Plaintiff because he had a valid state medical marijuana registry card to show that he was authorized to use medical marijuana
B) for the Plaintiff because he did not cause his own injury at work
C) for Wal-Mart, because the state law did not change employment-at-will
D) for Wal-Mart, because plaintiff's marijuana use led to his injury