[dredmorbius]

My read is that the science was principally this 'graph:

For opioid addiction itself, however, the best treatment is indefinite, possibly lifelong maintenance with either methadone or buprenorphine (Suboxone). That is the conclusion of every expert panel and systematic review that has considered the question — including the World Health Organization, the Institute of Medicine, the National Institute on Drug Abuse and the Office of National Drug Control Policy.

With four links in that last sentence.