It's hard to determine who wants to and who doesn't want to. You've got to get them clear off the drugs and stuff first in order for them to actually make the clear decision as to whether they really want to stay off them and move forward with their lives.
When we have certain inmates who continually try to bring drugs in or are continually smoking to get high and getting caught, we do separate them. We do put them in celled units where they do get locked down at night, rather than having a dorm where they're up and free during nights. We do what we can to separate those, I guess, problematic inmates from those who aren't.