Validation of self-reported cannabis use by urine analysis

Area of Science:

• Addiction Research
• Forensic Toxicology
• Psychopharmacology

Background:

• Self-reported drug use is common in addiction research.
• Validating self-reports is crucial for accurate treatment and research.
• Multiple drug users often present unique challenges in data collection.

Purpose of the Study:

• To assess the validity of self-reported cannabis use in young, multiple drug users.
• To determine the predictive power of self-reported cannabis use recency and frequency on biological markers.
• To evaluate the reliability of self-reported drug consumption data from individuals in treatment.

Main Methods:

• 113 young multiple drug users were interviewed at one-year follow-up.
• Subjects reported cannabis use recency, frequency, and dose in the past 30 days.
• Urine samples were analyzed for delta 9 THC metabolites.

Main Results:

• Recency of cannabis use was the strongest predictor of urine test results.
• Frequency of use significantly improved the accuracy of predicting urine test outcomes.
• Results demonstrated strong support for the validity of self-reported cannabis use.

Conclusions:

• Valid self-reports of cannabis consumption can be obtained from multiple drug users in treatment.
• Self-report measures, particularly when including frequency, are reliable indicators of recent cannabis use.
• Findings support the utility of self-reported data in addiction research and clinical settings.