This article examines issues related to integrating drug treatment systems for criminal justice offenders. It discusses how the demand for treatment far exceeds availability for the large number of offenders who have substance use disorders. Most treatment provided in correctional settings is insufficient, such as self-help groups without clinical treatment. When offenders are released, continuity of treatment is often lacking. The article argues more needs to be done to apply lessons from research on effective community-based treatment to the criminal justice system. This includes providing clinically appropriate treatment matched to offenders' needs and integrating services as offenders transition between community supervision and incarceration.