Marijuana, a Schedule 1 drug under the federal Controlled Substances Act (CSA), is the most commonly detected illicit drug in employment drug testing. According to Quest Diagnostics, in 2018, approximately 3% of urine-based workplace drug screenings tested positive for marijuana. Notwithstanding marijuana’s illegality under federal law, 33 states and the District of Columbia have legalized marijuana for recreational or medicinal use. And it is big business. The Colorado Department of Revenue recently revealed that its tax, license and fee revenue from marijuana has reached $1.02 billion. Legal marijuana appears here to stay in the United States. Many state and local jurisdictions have enacted anti-discrimination laws concerning marijuana use. Generally, such laws prohibit employers from taking adverse action against an employee who uses marijuana in conformance with the local jurisdiction’s marijuana laws, so long as the employee does not consume cannabis at...

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