More Americans Are Smoking Marijuana And Driving, But Identifying Them Is Tricky

Determining whether a driver is impaired is fairly straightforward, along the lines of “can you touch your finger to your nose?”

Determining why a driver is impaired is a whole other matter. Sure, a breath analyzer test (Breathalyzer is one brand of such a test) can show whether a driver has been drinking alcohol and provide an estimate of the volume of it circulating in the blood. But what if alcohol wasn’t the driver’s drug of choice?

Alcohol breath analyzers don’t detect marijuana. In fact, there’s no comparable roadside test for that drug. And yet, as psychiatrist and marijuana researcher Dr. Igor Grant told me, “the number of stoned drivers has skyrocketed.”

That’s not surprising, considering that as of the Nov. 8 election, 28 states and the District of Columbia have legalized medical marijuana, while eight states and the District of Columbia have decriminalized its recreational use.

“In Seattle, they’re driving down the street smoking

... read more at: http://www.forbes.com/sites/ritarubin/2016/11/30/more-americans-are-smoking-marijuana-and-driving-but-identifying-them-is-tricky/

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