Often, drug abusers come into contact with the criminal justice system earlier than other health or social systems, presenting opportunities for intervention and treatment prior to, during, after, or in lieu of incarceration. Research has shown that combining criminal justice sanctions with drug treatment can be effective in decreasing drug abuse and related crime. Individuals under legal coercion tend to stay in treatment longer and do as well as or better than those not under legal pressure. Studies show that for incarcerated individuals with drug problems, starting drug abuse treatment in prison and continuing the same treatment upon release—in other words, a seamless continuum of services—results in better outcomes: less drug use and less criminal behavior. More information on how the criminal justice system can address the problem of drug addiction can be found in Principles of Drug Abuse Treatment for Criminal Justice Populations: A Research-Based Guide (National Institute on Drug Abuse, revised 2012).