Weekly cannabis medicine research digest. 46 peer-reviewed articles scored and curated by CED Clinic.
420 with CNW – Texas Grapples with Increasing Cases of Marijuana DUI
WHY IT MATTERS: If Texas moves toward a per se THC limit for driving, patients using cannabis for legitimate medical purposes could face DUI charges even when they are not functionally impaired, because THC and its metabolites can persist in blood well beyond any period of active intoxication. CLINICAL OVERVIEW: Cannabis-impaired driving remains a serious public safety challenge because THC affects psychomotor function, reaction time, and divided attention in ways that meaningfully increase crash risk. Unlike alcohol, there is no validated per se blood THC threshold that reliably correlates with functional impairment, making enforcement both scientifically and legally complicated.
First-of-its-kind long-term study at Virginia Tech shares how cannabis use can affect driving
WHY IT MATTERS: Patients who use cannabis medicinally need to understand that subjective feelings of being “fine to drive” can diverge significantly from actual measured driving performance, particularly in the hours following consumption. CLINICAL OVERVIEW: The relationship between cannabis consumption and driving performance is genuinely complex, because THC impairment does not follow the same linear dose-response curve that alcohol does, and standard roadside testing fails to capture the nuanced ways cannabis affects reaction time, lane tracking, and divided attention. Tolerance, consumption method, cannabinoid ratios, and individual pharmacokinetics all influence how significantly any given person is impaired behind the wheel.