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No, this is not true. The PO is not in charge of deciding if the parole would end early, the Judge is. The Defendant can file a motion asking the Court to allow early termination. The Court normally wants at least 2/3 of the time completed, all hours completed, all tests/classes done, all UAs negative, etc. Then, it is still at the Judge's discretion. The PO and DA can also weigh in with their recommendation.
However given the nature of the conviction, the Judge is less likely to allow early termination. This is what the PO likely meant. Not that the Court will not, but simply that it is less likely to allow it.
However, someone in your situation can still try.
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