Once a Regional District has been established by the Governor, the governing bodies of each of the Participating Entities comprising such district shall take all actions required by law for the issuance of the type of bonds described in the Final Project Plan. A transcript of proceedings for each of the Participating Entities shall thereafter be prepared and submitted to the Attorney General of Oklahoma for examination. Such bonds, having been examined and certified as legal obligations by the Attorney General in accordance with such requirements as the Attorney General may make, shall be incontestable in any court of the State of Oklahoma unless suit thereon shall be brought in a court having jurisdiction thereof within thirty (30) days from the date of such approval. Bonds so approved by the Attorney General shall be prima facie valid and binding obligations according to their terms. The only objection which may be offered thereto in any suit instituted after such thirty-day period shall have expired shall be a violation of provisions of either the United States Constitution or the Oklahoma Constitution.
Okla. Stat. tit. 62, § 828