Urine Testing for Detection of Marijuana: An Advisory
Three years ago, however, the first urine-screening test became available to make such screening possible at moderate cost (SYVA). The urine test is based on detection of 11-nor-delta-9-tetrahydrocannabinol-9-carboxylic acid (9-carboxy-THC), a metabolite of delta-9-THC, which is the primary pharmacologically active component of marijuana.
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