(a) Section 2166.003 does not prohibit the commission from undertaking on a cost recovery basis a project generally excluded from the application of this chapter by that section.
(b) A service provided under this section is not subject to the requirements of Chapter 771. The commission shall establish a system of charges and billings for services provided to ensure recovery of the cost of providing the services and shall submit a purchase voucher or a journal voucher after the close of each month to an agency for which services were performed.