Dr. Dennis Rosenbaum, a professor at the University of Illinois at Chicago, completed a six-year study of 1,798 students and found that "DARE had no long-term effects on a wide range of drug use measures"; DARE does not "prevent drug use at the stage in adolescent development when drugs become available and are widely used, namely during the high school years"; and that DARE may actually be counter productive. According to the study, "there is some evidence of a boomerang effect among suburban kids. That is, suburban students who were DARE graduates scored higher than suburban students in the Control group on all four major drug use measures."

Source

Rosenbaum, Dennis, "Assessing the Effects of School-based Drug Education: A Six Year Multilevel Analysis of Project DARE," Abstract of article published in Journal of Research in Crime and Delinquency, Vol. 35, No. 4 (November, 1998).
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