"[V]ery few rehabilitation programs have the evidence to show that they are effective. The resort-and-spa private clinics generally do not allow outside researchers to verify their published success rates. The publicly supported programs spend their scarce resources on patient care, not costly studies.
And the field has no standard guidelines. Each program has its own philosophy; so, for that matter, do individual counselors. No one knows which approach is best for which patient, because these programs rarely if ever track clients closely after they graduate. Even Alcoholics Anonymous, the best known of all the substance-abuse programs, does not publish data on its participants’ success rate."