As a growing number of states legalize cannabis, health officials are increasingly sounding the alarm for technology that can quickly determine when drivers are stoned.

A solution for measuring alcohol intoxication has existed since 1954: the Breathalyzer.

No such technology yet exists for cannabis, but several tech startups and university scientists say they're close to commercializing something resembling a cannabis breathalyzer.

Still, others are quick to caution the answer is not that simple.

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Alicia Wallace ~ CNN Business ~