Observational study of visual testing efficacy in detecting cannabis usage

Drug recognition and examination programs are widely used to detect drug impairment in motor vehicle operators. Visual tests a key assessment the detection of cannabis-related impairment. Participants were recruited via social media from medical cannabis community Southwestern Ontario, Canada. Twenty-two participants completed full observational trial design. The majority (n = 13 or 59.1%) male, with mean age 36 years (SD 9.4; range: 24–59). underwent following protocol: 1) First round testing (vital signs, bio sample collection, visual tests, subjective data, neurocognitive testing) (Baseline phase); 2) Consumption inhalation; 3) Second 30 minutes consumption (THC 4) Additional rounds at 90, 150, 210 (Recovery phase). data vital signs did not follow typical patterns associated acute intoxication. With blood THC levels more than double Canadian legal limit (5 ng/mL), results diagnostic for impairment, as maintained normal pupil sizes ocular convergence patterns. is component standardized examinations detecting drivers; however, our indicate that may be an effective tool specific population users.