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.

© Cappi Thompson/Getty Images

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. Critics note the technology must detect recent cannabis use and also prove that cannabis in a person's system impaired his or her driving. A cannabis breathalyzer that does both of those things has proven elusive, because, unlike alcohol, cannabis can stay in people's bodies long after their "high" has worn off.

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