Michael Elliott, executive director of the Marijuana Industry Group in Denver, said the decision moves the ball squarely into the court of the state legislature, which has already come under pressure to add medical marijuana — and even recreational pot — to the state's list of protected after-hours activities.
"Basically people will fail a drug test even though they are not impaired. That is extremely unfair, and it's not like that with alcohol," Mr. Elliott said. "When you're done being drunk, the alcohol is no longer in your system or in your blood, whereas with marijuana it can stay in your system for weeks, maybe more than a month. So that's the problem. You could get fired from your job for marijuana that you consumed three weeks beforehand."