Can I just add that with methadone, there will be side effects. If the individuals use other drugs, other opiates or heroin, they will be sick. They're well aware of the consequences of using methadone.
I'd also add that the parole officer plays a critical role inside the institution and in the community in terms of the assessment of the person's appropriateness for methadone. Although it's a medical issue, the parole officer has to do a bit of research in terms of identifying the history of the problem.
In terms of using urinalysis for heroin, heroin stays in your system for a very short period of time. It's probably the shortest period of time of any of the drugs we deal with. It would be less than a day. It would probably be less than alcohol. It's probably less than 12 hours. The consequence is that it would be very difficult to detect through urinalysis.