(a) The Title IV-D agency and a qualified county may enter into a written agreement under which reimbursement for salaries and certain other actual costs incurred by the clerk, sheriff, or constable in Title IV-D cases is provided to the county.
(b) A county may not enter into an agreement for reimbursement under this section unless the clerk, sheriff, or constable providing service has at least two full-time employees each devoted exclusively to providing services in Title IV-D cases.
(c) Reimbursement made under this section is in lieu of all costs and fees provided by this subchapter.