The past few years have been paradigm shifting for U.S. marijuana laws. While marijuana remains federally illegal as a controlled substance, 33 states have legalized its sale, possession, and use for recreational purposes, medical purposes, or both. This trend toward legalization has placed employers in a quandary. Employers used to be able to routinely test for marijuana and include it among the list of substances for which a positive test would disqualify someone from employment. If, however, marijuana is now legal in a majority of states, how should an employer handle the intersection of marijuana and the workplace?