Newly developed 3-minute saliva test could help cops determine if you're driving while high

Roadside breathalyzers, used for estimating blood alcohol content, have been used by law enforcement as far back as the 1930s. However, to date there is still no equally fast-acting, accurate roadside equivalent that cops can use if they suspect someone of driving under the influence of marijuana. That could be about to change, however, due to a new saliva-based test developed in the laboratory of Shan Xiang Wang at Stanford University in California.
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