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The Timeline Follow-back (TLFB) questionnaire has become a pre-eminent tool in substance use and human immunodeficiency virus (HIV) risk research, allowing researchers to assess fine-grained changes in risk behavior over long periods. However, data on accuracy of recall over long (12-month) periods are sparse, especially combined data on HIV risk and substance use from post-treatment samples. Studies on the development of substance use and HIV risk stand to benefit from data on the accurate recall of such behavior over longer retroactive spans of time.

A Comparison of Long- vs. Short-Term Recall of Substance Use and HIV Risk Behaviors