Historical QOD 4/21/2009: What is the relative incorporation rate (ICR) for cocaine versus THC into human hair?
THC and (especially) its main metabolite 11-nor-_9-tetrahydrocannabinol-9-carboxylic acid (THC-COOH) have very low incorporation rates (ICR) into hair, with a 3600-fold difference between the ICR of cocaine and that of THC-COOH.
Musshoff F, Madea B. 2007, Anal Bioanal Chem, 388: 1475-1494
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