A groundbreaking study from Johns Hopkins Bloomberg School of Public Health has identified a critical road safety concern: combining cannabis edibles with alcohol produces driving impairment levels 2.8 times greater than alcohol consumption alone. Led by Dr. Ryan Vandrey, the controlled research examined 22 participants through driving simulations after consuming various substance combinations, revealing that cannabis and alcohol interact synergistically rather than additively. Participants using both substances demonstrated increased lane weaving, slower reaction times, and compromised vehicle control. The findings carry significant implications as cannabis legalization expands across multiple jurisdictions. Perhaps most alarming, standard field sobriety tests—the primary assessment tool for law enforcement—consistently failed to detect impairment from cannabis edibles. This detection gap presents a substantial public health challenge for traffic safety enforcement and prevention strategies. Read the full article on GMJ Newsroom.
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