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Temporal indication of marijuana use can be estimated from plasma and urine concentrations of delta9-tetrahydrocannabinol, 11-hydroxy-delta9-tetrahydrocannabinol, and 11-nor-delta9-tetrahydrocannabinol-9-carboxylic acid.
Manno JE, Manno BR, Kemp PM, Alford DD, Abukhalaf IK, McWilliams ME, Hagaman FN, Fitzgerald MJ. Manno JE, et al. Among authors: kemp pm. J Anal Toxicol. 2001 Oct;25(7):538-49. doi: 10.1093/jat/25.7.538. J Anal Toxicol. 2001. PMID: 11599597
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