Accurate marijuana breathalyzers are almost here, but do THC levels even mean anything?

Accurate marijuana breathalyzers are almost here, but do THC levels even mean anything?



One of the many challenges authorities are currently facing, following the growing spread of recreational marijuana legalization, is the lack of any clear or easy way to measure THC exposure in regards to driving impairment. For years scientists have been trying to engineer a straightforward marijuana breathalyzer, akin to what police around the world use for alcohol. But the minuscule presence of THC molecules in breath have proved difficult to detect, and unlike alcohol, there is no clear level of intoxication to correlate with impairment. 

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