(a) An advance under a revenue anticipation agreement may be used only for the purposes authorized by this subchapter.
(b) It is not a defense to repayment of advanced amounts that the funds are used for a purpose not authorized by this subchapter.
(c) The auditor of the hospital district shall:
(1) audit the use of advanced funds at the time of the district's regular audit; and
(2) certify to the commissioners court whether those funds are used for proper operating and maintenance purposes authorized by this subchapter.