Local Government Code §375.205

(a) The district shall submit bonds and the appropriate proceedings authorizing their issuance to the attorney general for examination. This subsection applies only to bonds that are public securities, as that term is defined by Section 1202.001 , Government Code. (b) If the bonds recite that they are secured by a pledge of assessments, impact fees, revenues, or rentals from a contract or lease, the district also shall submit to the attorney general a copy of the assessment procedures, impact fee procedures, contract, or lease and the proceedings relating to it. (c) If the attorney general finds that the bonds have been authorized and any assessment, contract, or lease has been made in accordance with law, the attorney general shall approve the bonds and the assessment, impact fee, contract, or lease, and the bonds shall be registered by the comptroller. (d) After approval and registration, the bonds and any assessment, impact fee, contract, or lease relating to them are incontestable in any court or other forum for any reason and are valid and binding obligations for all purposes in accordance with their terms.