Treating persons who are addicted and dependent to drugs or alcohol and have ended up in the criminal justice system has proven to be effective in preventing repeat drug related criminal offenses by those who do become rehabilitated. For criminal justice clients in Oakland that do partake in drug rehabilitation centers, even if not of their own choice as is sometimes court ordered, these individuals have a far better chance at handling the crux of the problem so that they can stay off of drugs and off of negative influences and [[[committing drug related criminal activity. The costs to the criminal justice system associated with these drug related offenses is also affected beneficially when criminal justice clients are rehabilitated in drug rehab facilities in Oakland instead of incarceration or other harsh punishment.