This Law Firm Publication by Honigman Miller Schwartz and Cohn LLP discusses the US Court of Appeals for the Sixth Circuit's decision in Casias v. Wal-Mart Stores Inc., ruling that an employer did not violate the Michigan Medical Marihuana Act (MMMA) when it terminated an employee with a state-issued medical marijuana registry card for failing a drug test. The court held that the MMMA, which legalized the use of marijuana for certain medical purposes, only regulates action taken by Michigan, not by private employers. Although the Sixth Circuit's decision is binding on federal trial courts, Michigan state courts are not required to follow it.