La. Stat. tit. 38 § 452
Refunding bonds shall be authorized by a resolution of the board of commissioners of the levee district or levee and drainage district, and the resolution shall be promulgated by one insertion in the official journal of the district to be made within thirty days after the date of the adoption of the resolution. For a period of thirty days from and after the date of publication of the resolution, any person in interest shall have the right in any court of competent jurisdiction, to contest the regularity, formality, or legality of the bonds or of the provision for the payment thereof, for any cause. After this time, no person shall have any cause or right of action to contest the regularity, formality, or legality of the bonds or of the provision for the payment thereof for any cause. If the regularity, formality, or legality of the refunding bonds or of the provision for the payment of the bonds is not contested within the thirty days herein prescribed, the authority of the levee board or levee and drainage board to issue the bonds, the regularity, formality, and legality of the bonds and of the provision for payment shall be conclusively presumed, and no court shall have authority to inquire into these matters.
La. R.S. § 38:452