I think it was here on OPF but recently someone posted a desire to be involved in a study about opiod dependence.
I just came across this article this morning, and they have studied prescription pain killer addicts. Participants were treated for free with Buprenorphine and counseling.
This study is already complete but according to the article they indicate the need to do more. If you want to be a part of a long term study (free treatment perhaps), I'd contact them: