DUID laws vary widely

SEATTLE – As states across the country have legalized medical and recreational marijuana, each one has varying legal limits determining whether a driver is impaired by marijuana.

In some states, drivers are not allowed to have any detectable amount of marijuana in their systems. Washington, Colorado, Montana, Pennsylvania, Ohio and Nevada each have set specific numerical standards to establish when a driver is legally impaired by marijuana. Other states have not.

Law enforcement agencies and state toxicology labs normally test blood or urine samples to determine the amount of marijuana in the system of a driver suspected of being impaired.

Marijuana advocates, researchers and legal experts warn that the current testing methods have troubling limitations that could result in unfounded arrests or convictions.

"If you don't want people to drive impaired then charge them for driving impaired," said Douglas Hiatt, a Seattle-based criminal defense attorney. "Look at the totality of...

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