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To determine how drug markets differed and how drug users and drug markets were affected by different circumstances, the Procurement Study, which added 100 questions to the DUF interview, was implemented quarterly for one year in six DUF sites (Chicago, New York, Portland, San Antonio, San Diego, and Washington, DC). These sites were selected because they had consistently shown the highest rates of heroin use among the DUF sites and also had substantial levels of cocaine use. Because previous studies provided an overview of heroin markets, this research emphasized interviewing crack users. The procurement interview collected data on both drug purchase patterns and drug use patterns for specific drugs. The DUF interview provided demographic and descriptive data on the respondent's alcohol/drug history and on the crime for which he or she was arrested. At the end of the interview, respondents, all of whom were recent arrestees, were asked to provide a urine specimen that was tested for ten drugs in order to validate their self-reported drug use.