The intersection of public health and public safety present an enormous opportunity to improve the lives of millions of Americans. Approximately 70% of those involved in the criminal justice system have regularly abused alcohol or other drugs. Many individuals end up incarcerated when alternatives to incarceration such as drug addiction treatment and supervision can save money, improve lives and reduce crime. Treatment is the key. Our efforts focus on developing effective treatment strategies to reach criminal justice involved populations and to train stakeholders in criminal justice settings about what research has shown us about the nature of drug abuse and addiction and the evidence-based practices that can be brought to bear on solving this public health/public safety problem.