Driving while high is hard to detect. States are racing to find a good tool
Police are experimenting with various methods to determine whether drivers are under the influence of marijuana, but unlike alcohol, a number of factors make that difficult to know with certainty.
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Police are experimenting with various methods to determine whether drivers are under the influence of marijuana, but unlike alcohol, a number of factors make that difficult to know with certainty.
(Image credit: Kathryn Scott Osler)
