Do We Need Roadside Marijuana Tests?

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A North Dakota Highway Patrol officer administers a sobriety test. Photo courtesy North Dakota Dept of Transportation via Flickr

As the number of states allowing recreational or medical use of marijuana grows, law enforcement is gearing up for the challenge of detecting drivers who may be a danger to themselves or others. But it’s impossible to set an accepted standard for measuring impairment, argues a TCR columnist . . .

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