In 2020, Nevada dispensaries sold nearly $700 million dollars worth of cannabis and derivative products. Before AB400 was signed into law last week, many who used those products also drove a motor vehicle within 48 hours of use and likely exceeded the per se blood level limit for Tetracanabidiol (THC), the psychoactive component in cannabis, when they did it.
The legal standard for judging driver impairment for alcohol is consistent and accurate, an enduring legal measuring stick used in every U.S. state. With a higher blood alcohol content comes an increased level of impairment, a near linear relationship, but intoxication is not as predictable based on a blood level limit for THC.
People react differently to cannabis use. Numerous studies show that an infrequent user may experience pronounced effects when consuming small amounts of THC, but a daily medical cannabis user, for instance, may exhibit no reduction in psychomotor ability after use, yet…