(a) The comptroller shall audit a voucher either before or after the comptroller issues a warrant or initiates an electronic funds transfer in response to the voucher. The audit must be conducted in accordance with Sections 403.011(12), 403.071, and 403.079.
(b) If the comptroller audits a state agency’s voucher after the comptroller issues a warrant or initiates an electronic funds transfer in response to the voucher, the comptroller may require the agency to maintain in its files the description, information, and documentation relating to the travel expense paid or reimbursed by the voucher until the comptroller audits the voucher.

(c) If a state agency pays or reimburses a travel expense without first submitting a voucher to the comptroller, the comptroller may audit the payment or reimbursement for compliance with this chapter and the travel provisions of the General Appropriations Act. The comptroller may report the results of the audit to the governor, the lieutenant governor, the speaker of the house of representatives, the state auditor, and the Legislative Budget Board. The state agency shall cooperate with the comptroller and make available the description, information, and documentation required by the comptroller at the time and in the manner required by the comptroller.
(d) The comptroller may require a state agency to maintain in its files the description, information, and documentation regarding a travel expense payment or reimbursement for the period required by the comptroller.
(e) The comptroller may require or authorize the description, information, and documentation relating to a travel expense payment or reimbursement to be maintained in paper form or electronically.