The National Treatment Improvement Evaluation Study (NTIES) was a congressionally mandated 5-year evaluation of the effectiveness of substance abuse treatment services delivered in comprehensive treatment demonstration programs supported by the Center for Substance Abuse Treatment (CSAT). The demonstration programs (Target Cities, Critical Populations, and Incarcerated and Non-incarcerated Criminal Justice Programs) provided treatment services to underserved and vulnerable populations whose drug problems tend to be more severe and who have few social supports to help in their recovery. Conducted from 1993 to 1995, NTIES built upon earlier national multisite treatment evaluation studies, including the Drug Abuse Reporting Program (1969–1973), the Treatment Outcome Prospective Study (1979–1981), the Drug Services Research Study (1989–1990), and the Drug Abuse Treatment Outcome Study (1991–1993). NTIES sought to answer questions about the ...

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