Several U.S. Supreme Court justices seemed sympathetic during Oct. 15 oral argument to a truck driver who was fired after failing a drug test following consumption of a product marketed as drug-free.
Respondent Douglas Horn was let go from his job as a commercial truck driver because he tested positive for tetrahydrocannabinol (THC)—the psychoactive compound in marijuana that produces a high—after consuming a hemp-based product that was advertised as THC-free. The hemp plant is a relative of marijuana.