Research summary
A scientific review of experimental research reported modest but meaningful acute impairment in certain driving-related skills associated with THC. Dose, route, recency of use, and tolerance can modify observed effects. CBD’s potential influence on THC-related driving effects remained inconclusive in the reviewed evidence. Expert interpretation should connect the particular task measured to the asserted real-world limitation, rather than equating every cannabinoid detection with a quantified loss of driving ability.
Forensic interpretation
This research describes specific experimental conditions. It does not establish an individual driver’s impairment or the cause of an observed clinical finding without case-specific information. Analytical methodology, timing, dose, route of administration, and plausible alternative explanations should be assessed before making a forensic inference.