An increasing number of states are opting to legalize marijuana for medicinal use, and some states have legalized this substance for recreational use as well. Paul Platt has a serious medical condition and as a result is a properly registered medical marijuana patient under state law. When a random drug test by his employer resulted in Paul testing positive for marijuana, he was fired. Paul is contesting the dismissal on the grounds that he was using this drug legally under state law. What resulted?