What jurisdiction is trying to prevent you from getting on medically supervised methadone treatment because you are on probation?
Because you have had a previous addiction to heroin, and you have an addiction to an uncontrolled substance that significantly impairs your major life activities, you're protected under the ADA the Americans with disabilities act and the court cannot deny you medical care that you would otherwise get if you were not on probation.
Neither can your probation officer.
It's a federal law. You need to get an ADA lawyer. You don't have to wait till June unless you just want to.