Research Summary: This manuscript presents results from the National Evaluation of the Gang Resistance Education and Training (G.R.E.A.T.) program, a school‐based prevention program targeting middle‐school students. A longitudinal quasi‐experimental research design was conducted from 1995 through 1999. Beneficial program effects emerged gradually over time so that there was, on average, more pro‐social change in the attitudes of G.R.E.A.T. students than the non‐G.R.E.A.T. students four years following program exposure. Policy Implications: Two specific policy recommendations stem from this research. First, law enforcement officers can be effective providers of school‐based prevention programs. Second, to better assess program effectiveness, evaluations should include design features that allow for assessment of long‐term or delayed program effects.
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