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Drugged driving is much harder to prove, I would think. Drug urine screens just detect presence of a substance without providing any information about amount or time of usage, just so long as the substance is still at detectable levels. Even the blood assay results that confirm still don't give you a lot of data to work with.
We've all seen the scene in the movies, though, where the stoner rolls the window down and the cloud of pot smoke billows out toward the cop ... no doubt there. (Yes, this really happens in real life, although the effect is not as dramatic.)
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