You are not correct on this. I just finished the AARP Driving Course, and it states: " Marijuana affects psychomotor skills and cognitive functions critical to driving, including vigilance, drowsiness, time and distance perception, reaction time, divided attention, lane tracking, coordination, and balance." Not much different from driving while drunk. It is more difficult to determine if one is impaired while using marijuana, in the same way done for alcohol, as the blood concentration of marijuana active component, THC, does not closely correlate with how impaired a driver might be. But, impaired they are.
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