Treating people inhumanely speaks more about the society who does it than the people who are in jail. Your own Bill of Rights prohibited cruel and unusual punishment and forcing people to go through withdrawls (if that is indeed the case, which we don't know it actually is) certainly qualifies. As does keeping people in total isolation, which is known to cause psychological damage. People literally do go crazy from being alone too long.
If the point of prison is to punish people for doing the crime, then fine. Punish people who did the crime, keep them in jail until they die but there is no need to be cruel and vicious about doing so. If penalizing criminals was just all about torturing them, then why don't you just go ahead and torture them to death? It's what countries who don't give a wit about due process of law or a fair judiciary do when people inconvenience them. Remove them permanently. Considering how the United States derides countries who arbitrarily do such things, I think this would be a hard position to justify in torturing prisoners either directly or indirectly.
Incidentally, if any of you seriously think that this is a good alternative, then in future arguments regarding the human rights violations and lack of due process of other countries, please consider your own attitudes towards people who are in prison but may or may not necessarily be a criminal (no law system is perfect; there is no way in hell that anyone can automatically determine everyone in jail is guilty. I'm generalizing here; not specific to the guy mentioned in this thread who is guilty)