|This presentation focuses on an investigation of the utility of drug testing in this new study, in a random survey of Chicago adults, ages 18 to 40 years. To our knowledge, this is the first community prevalence study to incorporate three separate biological measures (hair, urine, saliva) as an adjunct to a drug survey. Specifically, we address the following research questions: "Compared to a confidential drug survey, what is the incremental value of drug testing to our knowledge of prevalence for three illegal substances: marijuana, cocaine, and opiates (heroin)." "What is the relative increment for each specific type of test considered in this study?" and "How does this increment vary by substance?"
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