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briandmyers · 3814 days ago · link · · parent · post: There May Be A Green Light For Pot, But Not For Driving High : NPR
>> I don't think anyone would defend habitual drinkers should be able to drink more before being prosecuted for driving under the influence. I would defend exactly that (in a sense). In an ideal world, the traffic-stop test would measure impairment alone - from any cause (i.e. sleepiness or injury as well as substance use or abuse, of all kinds). Not impaired? No prob. The old physical walk-the-line tests are the closest thing I know of, to a real impairment-measuring test.