Abstract
A study of 113 young multiple drug users, interviewed at one year follow-up, was designed to assess the validity of self-reported cannabis use. Subjects provided information about the recency, frequency and typical dose of their use of cannabis in the preceding 30 days. Urine samples were collected and analyzed for δ 9 THC metabolites. Recency of use was the best predictor of urine test results, but a measure of frequency of use significantly increased the proportion of variance accounted for. The results strongly supported the validity of self-reported cannabis use and indicate that valid self-reports of drug consumption can be obtained from multiple drug users in treatment.
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