I don't know how imprisonment for drug addicts is "good" for them or for society. It's dehumanizing, and while in jail they can't work or take care of their kids and so they end up worse off then before. The system "traps" them by paroling them and giving them drug tests, and since they're addicted they end up back in jail. Only murderers/rapists/predators need to be in jail. Even the rationale behind putting petty dealers behind bars is suspect-as it does not deter people from using or buying-it discriminates against poor minorities while the rich drug lords remain untouchable.