According to the study, a loss of balance was the most consistent short-term sign of performance impairment across all subjects. An 11 percent increase in sway during an eyes-closed balance test was observed right after subjects’ consumed the cannabis products. Balance returned to normal after the one-hour follow up suggesting this kind of balance test may be a more effective way to measure cannabis intoxication, similar to sobriety tests currently used to identify alcohol-impaired drivers, rather than assigning an arbitrary THC limit, which would have no bearing on a driver’s level of impairment.
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