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The effects of cannabis on driving have been extensively studied for decades. Research consistently shows that typical cannabis use causes very little or no impairment to driving ability.
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An Arizona appeals court has ruled that marijuana users don't need to be actually impaired to be successfully prosecuted for driving under the influence. The common sense-defying ruling came Tuesday in the case of a man who tested positive for an inactive marijuana metabolite that remains in the body for weeks after the high from smoking marijuana has worn off.