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I am sorry to hear of this matter for your Dad.
While he cannot make any demands to the Parole Officer as to being tested at a hospital, he may go to a testing clinic that is reliable and be tested, at his expense, and then be tested by the PO and then that way he will have a back up test should the one the PO does come out positive.
I suggest that you can check with the courts
and get a list of court sanctioned, bona fide testing labs in your area - because you will need one of those to be accepted by the PO or the courts should he have to go before the Parole Board
for a revocation hearing.