I know of a family who sought a rehab center. Not much came from their research beyond a few with a strong religious orientation. They found a couple run by some "psychologists", but sounded dubious to me when the program was 'splained.
I know there are AA Chapters around. Any NA's? Perhaps they would know where help is available.
Good luck.
As a side comment, I wonder if the recent crackdowns on drugs are forcing folks to get off the stuff. If so, real drug rehab may be needed.