‘Arbitrary’ cutoffs of THC levels make it difficult to measure impaired driving

What’s the legal cutoff for marijuana levels? Unlike alcohol, cutoffs for THC vary from state to state, but the cutoff for impairment is less clear than alcohol.

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What’s the legal cutoff for marijuana levels? Unlike alcohol, cutoffs for THC vary from state to state, but the cutoff for impairment is less clear than alcohol.
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