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The page below is a sample from the LabCE course Drug Metabolism. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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To determine if a car accident was due to impairment, a urine specimen was sent to a laboratory that can differentiate THC-OH and THC-COOH. THC-OH was negative and THC-COOH was positive. Which is the most appropriate conclusion?

Please select the single best answer