Does The Increase In Cannabis Potency Change Results of Secondhand Smoke?

Can your employee test positive for Marijuana just from being in a room with a smoker?

A modernized study from Johns Hopkins University School of Medicine tested this theory to renew our knowledge from that 1980s study. Even with cannabis potency on the rise, it appears that nonsmokers even in a small ventilated room produced negative results for THC on a urinalysis. See the details of the press release in 2015 at