(a) The Title IV-D agency is liable for a fee or cost under this subchapter only to the extent that an express, specific appropriation is made to the agency exclusively for that purpose. To the extent that state funds are not available, the amount of costs and fees that are not reimbursed by the federal government and that represent the state share shall be paid by certified public expenditure by the county through the clerk of the court, sheriff, or constable. This section does not prohibit the agency from spending other funds appropriated for child support enforcement to provide the initial expenditures necessary to qualify for the federal share.
(b) The Title IV-D agency is liable for the payment of the federal share of reimbursement for fees and costs under this subchapter only to the extent that the federal share is received, and if an amount is paid by the agency and that amount is disallowed by the federal government or the federal share is not otherwise received, the clerk of the court, sheriff, or constable to whom the payment was made shall return the amount to the agency not later than the 30th day after the date on which notice is given by the agency.