La. Stat. tit. 39 § 1041
All resolutions authorizing the issuance of bonds of the City and public entities shall be published one time in the official journal of the City. It shall not be necessary to publish exhibits to such resolutions if the exhibits are made available for public inspection at reasonable times and that fact is stated in the publication. For a period of thirty days after the date of publication, any person in interest may contest the legality of the resolution and of any provision thereof made for the security and payment of bonds. After that time, no one shall have any cause or right of action to test the regularity, formality, legality, or effectiveness of said resolution and provisions thereof or of the bonds authorized thereby for any cause whatsoever. If no suit, action, or proceeding is begun contesting the validity of the bond issue within the thirty days herein prescribed, the authority to issue the bonds and to provide for the payment thereof, and the legality thereof and of all of the provisions of the resolution shall be conclusively presumed, and no court shall have authority to inquire into such matters.
La. R.S. § 39:1041
SEE ACTS 1985, NO. 674, §§14 - 17.