Texas Health and Safety Code - HEALTH & SAFETY § 363.134. Approval and Registration

(a) A public agency shall submit bonds issued by the public agency and records relating to their issuance to the attorney general for examination as to their validity. If the bonds are secured by a pledge of proceeds from a contract, the public agency shall submit to the attorney general for examination a copy of the contract and a copy of the records relating to the contract.

(b) If the attorney general finds that the bonds have been authorized and a contract entered into in accordance with law, the attorney general shall approve the bonds, and the comptroller shall register the bonds.

(c) Following approval and registration, the bonds are incontestable and are binding obligations according to their terms.