NerdWallet: Arbitrary Marijuana Limits Leave Drivers High and Dry

Hazy. Clumsy. Unreliable. No, we’re not talking about a marijuana-impaired driver, but rather certain testing criteria used to weed them out.

In several states, motorists are subject to “per se” marijuana laws, which set a specific limit of THC that drivers can have in their blood. THC is the main psychoactive element in cannabis. However, these laws tell us next to nothing about who’s fit to get behind the wheel, according to a May 2016 study from the AAA Foundation for Traffic Safety.

Researchers examined toxicology reports and…

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