Study: Low Levels of THC in Blood Not Associated With Significant Changes in Simulated Driving Performance

Subjects who have not recently consumed cannabis but still have residual levels of THC in their blood perform no differently on a driving simulator than do those who are THC-negative, according to data published in the journal Clinical Chemistry.

Researchers affiliated with the University of California at San Diego assessed THC blood levels and simulated driving performance in a cohort of 190 regular cannabis consumers. Study subjects were required to have abstained from cannabis for 48 hours prior to participating in the study.

Post-abstinence, nearly half of the study participants had detectable levels of THC (above 0.5ng/ml) at baseline, with one-quarter of participants testing positive for more than 2ng/ml of THC in blood. However, those testing positive for THC showed no significant differences in their baseline driving scores as compared to those with no quantifiable THC concentrations. 

Read the Study HERE