Technology closes in on a roadside device to check pot levels — but the definition of stoned driving remains elusive.
As cannabis wafts back into mainstream America on growing winds of legal change, a west coast company says it has reached a technological milestone that is quickly becoming crucial to the justice system: a device police can use to detect recent marijuana use—and the amount consumed—in the air a driver exhales.
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David Downs ~ ScientificAmerican.com via 420Intel.com ~
