As Marijuana Use Grows, Effect on Road Safety Remains a Blind Spot

[Unladen Swallow]

2. "Driving while impaired" can mean anything

...alcohol, marijuana, Xanax, pain killers. The states that leave this purposefully vague can charge and prosecute based on the officers' perceptions and observations. They just need to develop PC and then prove it to the satisfaction of a prosecutor. I've seen dozens of accidents caused my folks driving while drunk, high on MJ, high on opioids, etc. Any significant change in one's perception or reflexes should come with a public-health-minded philosophy of limiting moving 4000lb objects around at high speed.