The Urban Institute, the Center for Court Innovation, and RTI International conducted a five-year Multi-Site Adult Drug Court Evaluation on behalf of the National Institute of Justice. This presentation covers the impact of adult drug courts on: 1) drug use, 2) criminal activities and incarceration, 3) socioeconomic status, 4) mental health, and 5) families. Results include the impact of drug court participation in each area, and for whom drug courts work (i.e., whether they are particularly suited to some, as opposed to other, categories of offenders).