A decade after Colorado and Washington became the first U.S. states to legalize recreational cannabis, law enforcement officials still face a perplexing challenge: How can they tell if someone recently smoked a joint or ate a gummy and is too impaired to drive? With alcohol, the answer is relatively straight forward: Since 1931, with the advent of the "drunkometer" and 1954 with the invention of the more portable and refined breathalyzer, police have measured ethanol (a.k.a. ethyl alcohol) in breath, as a pretty reliable roadside measure of intoxication.

https://www.miragenews.com/reliable-cannabis-breathalyzer-possible-but-not-1081924/

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