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A sensitive analytical method was developed for quantitative analysis of Δ9-tetrahydrocannabinol (Δ9-THC), 11-nor-Δ9-tetrahydrocannabinol-carboxylic acid (Δ9-THC-COOH), cannabinol (CBN) and cannabidiol (CBD) in human hair. The identification of Δ9-THC-COOH in hair would document Cannabis use more effectively than the detection of parent drug (Δ9-THC) which might have come from environmental exposure...
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