Religious 'rehabs' and 12 step programs are big business. They are the ones pushing hardest against maintenance programs (including those already in place, like MMT and BMT. Hell, it wasn't that long ago that Guliani stopped all state funded Methadone clinics in NYC for 3 months, even less time since John McCain sponsored a bill to stop all Federal Methadone clinics).
Currently these zealots want mandatory Naltrexone implants for convicted opioid addicts as a part of their parole or probation programs.
I could easily see a comprimise. Sure, we'll let you put these dope fiends in drug treatment diversion programs instead of prison. In return we want those narcotic peddlers wearing Naltrexone pellets under their skin!
Bi-fuckin-partisanship.