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Collecting in-person UDS may not always be feasible, contributing to the need to understand factors that influence the validity of self-reported substance use.
Findings add to the literature that supports the validity of self-reported cannabis and cocaine use. The greater discrepancies between self-report and UDS test results of opioids and sedatives suggest adjunctive UDS may be required, although a variety of factors other than inaccurate self-report may be associated with this discrepancy.
Secondary analysis of data from 295 women