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you would need to speak to his parole officer and ask if they would support a motion to the parole board for an abatement - now, this does not mean he will be off parole - that will only happen at expiration. it only means that he would not be supervised any longer; therefore does not have to report, etc.
only the parole board can abate and, of course, they wont do that if the PO is not supportive of it. so you need to speak to the PO and/or that supervisor.