Review: THC Concentrations Are “Unreliable” Indicators of Driving Impairment

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a vial of blood labeled "Test: THC" with the "+" box indicating "positive" checked sitting on a bed of cannabis leavesa vial of blood labeled "Test: THC" with the "+" box indicating "positive" checked sitting on a bed of cannabis leaves"There are no empirically supported thresholds for blood or oral fluids that reliably indicate cannabis impairment," investigators concluded.

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