A federal judge ruled against Walmart in a recent lawsuit for terminating an Arizona employee who possessed a valid medical marijuana card after a drug test of the worker came back positive, the Phoenix New Times reports.  U.S. District Judge James A. Teilborg ruled last week that the company violated the nondiscrimination provision in the Arizona Medical Marijuana Act by eliminating the employee even though it couldn’t prove she was impaired by using the drug at work, according to the local publication.