The National Treatment Improvement Evaluation Study (NTIES) was one of the largest and most rigorous studies of substance abuse treatment ever conducted. In the course of its conduct, the study carefully examined many of the most important issues related to substance abuse treatment and came back with clear, unambiguous answers.

Among the key findings of the NTIES study:

NTIES Table of Contents | Introduction | Conclusions | Appendix | NTIES Findings on: Drug and Alcohol Use | Changes in Criminal Behavior | Employment, Income, and Homelessness | Changes in Physical and Mental Health | Changes in Sexual Behavior | Variation in Treatment Outcomes | Costs of Treatment