Study in JAMA Network Open finds cannabis edibles impair simulated driving at blood THC levels below legal thresholds

A crossover randomized clinical trial published in JAMA Network Open demonstrates that tetrahydrocannabinol (THC) from edible cannabis products impairs simulated driving performance in a dose-dependent manner. Crucially, this impairment was observed at blood THC concentrations below the per se thresholds commonly used by law enforcement, challenging the scientific validity of current legal frameworks for cannabis-impaired driving. The findings have significant implications for public safety and policy in jurisdictions where recreational cannabis is legal.