In October 1999, National Treatment Accountability for Safer Communities (TASC), in cooperation with the Office of Justice Programs, Drug Courts Program Office and the Substance Abuse and Mental Health Services Administration, Center for Substance Abuse Treatment, developed and distributed a questionnaire designed to describe substance abuse treatment services and other treatment services currently used by adult drug courts and to identify significant issues faced by adult drug courts in obtaining and delivering high-quality comprehensive treatment services. Surveys were distributed to 263 operating adult drug courts, and 212 courts (81 percent) responded. The results of this national survey show clearly that treatment services designed for and used by drug courts comport with scientifically established principles of treatment effectiveness. Overall, the structure of drug court treatment is consistent with the principles established by the National Institute on Drug Abuse and is delivered according to the Drug Court Key Components and related Performance Benchmarks. The standards promulgated in these documents present succinct descriptions of treatment delivery methods that have been effective with offender and other populations and serve as a guide to present survey findings in the context of effective professional practices. Three appendixes contain the Drug Court Treatment Services Inventory, the Drug Court Treatment Services Followup Questionnaire, and the NIDA Principles of Addiction Treatment. (Contains 60 references, 33 figures, and 3 tables.) (GCP)