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. (more…)