Tex. Local Government Code § 281.075: APPROVAL; REGISTRATION.

(a) An authority shall submit the bonds it issues to the attorney general for examination. If the attorney general finds that the bonds are authorized in accordance with law, the attorney general shall approve the bonds and the comptroller of public accounts shall register them.

(b) Bonds that are approved and registered under Subsection (a) are incontestable in a court or other forum and are valid and binding obligations in accordance with their terms.

(c) If the bonds recite that the security for the bonds includes a pledge of the proceeds of a contract or a lease to which the authority is a party, a copy of the contract or lease and of the proceedings authorizing the contract or lease may be submitted to the attorney general with the bond records. If a contract or lease and a record of the corresponding proceedings is submitted to the attorney general, the approval of the bonds by the attorney general is also an approval of the contract or lease and the contract or lease is incontestable.

Acts 1987, 70th Leg., ch. 149, Sec. 1, eff. Sept. 1, 1987.