Smoking pot nearly doubles risk of serious crash
The study did not note precise levels of THC present in each instance, though as CBC News reports, other research has proven a positive link between the higher crash likelihood and elevated THC levels.
Law enforcement agencies are currently struggling to effectively test for THC impairment during roadside stops. Unlike blood-alcohol levels, which can be easily tested for using a breath test, THC is harder to detect. As a result, most agencies have adopted a zero-tolerance policy.
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