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Posted on: October 18, 2018 at 13:25:45 CT
Spanky KU
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Part of the problem is that it is difficult to accurately measure how pot impacts drivers. "Many studies, using a variety of methods, have attempted to estimate the risk of driving after use of marijuana," a NHTSA report advised Congress last year. "While useful in identifying how marijuana affects the performance of driving tasks, experimental and observational studies do not lend themselves to predicting real-world crash risk."
Police have a particularly difficult challenge because of the way marijuana works in the body. Blood alcohol levels provide a direct correlation showing how much a motorist has had to drink, with those levels dropping rapidly as someone sobers up. But while THC levels spike after smoking weed or eating a consumable, the psychoactive ingredient remains in the body for weeks, long after it has stopped having any impact.