Scientists Unveil Nanotube-Equipped Weed Breathalyzer 

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With 33 states and the District of Columbia having legalized marijuana in some form or another, law enforcement officials have been grappling with how to assess whether someone is driving while high on weed.
Blood and urine tests have proven  totally unreliable ,  leaving it up to an officer’s discretion whether or not someone has been driving while baked.  That may change with the introduction of a device which can detect how much THC is in one’s breath, according to  NPR .

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