The National Safety Council (NSC) supports policies to mitigate and eliminate the risks of cannabis (marijuana) and other products containing delta-9-tetrahydrocannabinol (THC), the impairing component in cannabis. Safety concerns are paramount as legalization and decriminalization continues.
NSC believes it is unsafe to be under the influence of cannabis while working in a safety sensitive position1 due to the increased risk of injury or death to the operator and others. Research is clear that cannabis impacts psychomotor skills and cognitive ability. However, the amount of THC detectable in the body does not directly correlate to a degree of impairment. At this time, NSC believes there is no level of cannabis use that is safe or acceptable for employees who work in safety sensitive positions.
Full DocumentW-Cannabis Impairment in Safety Sensitive Positions - 153