Stop Pretending Sober Drivers Are Stoned: New at Reason

Last year Kali Su Schram was sentenced to six months in jail because of a fatal traffic accident she did not cause, thanks to Michigan's unjust and unscientific definition of drugged driving. Schram had the right of way when a bicyclist suddenly appeared in front of her at an intersection, but she was blamed anyway because she had a detectable amount of THC in her blood.

California, where state-licensed marijuana stores began serving recreational consumers on Monday, takes a more rational approach to driving under the influence of cannabis, requiring evidence of impairment. But as Jacob Sullum notes, three of the eight states where marijuana is legal for nonmedical use have adopted versions of the Michigan model, falsely equating impairment with arbitrary levels of THC in the blood.

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