THC is the most commonly detected intoxicant in US drivers, with around 13% of drivers testing positive for marijuana use, compared to 8% for alcohol. However, cannabis use remains detectable for much longer than alcohol, and also for long after the driver is no longer impaired.

THC is the most commonly detected intoxicant in US drivers, with around 13% of drivers testing positive for marijuana use, compared to 8% for alcohol. However, cannabis use remains detectable for much longer than alcohol, and also for long after the driver is no longer impaired.: https://ift.tt/2Ji11zD Read more... https://ift.tt/2OUFaVd