La. Revenue and Taxation § 47:338.46
The resolution authorizing the issuance of bonds hereunder and pledging and dedicating sales tax revenues to the payment thereof shall be recorded in the mortgage records of the parish in which the municipality is located, and shall be published in one issue of the official journal of the municipality. For a period of thirty days from the date of the publication of said resolution, any person in interest may contest the legality of the bonds provided for or the tax, the proceeds of which are so pledged and dedicated, for any cause, after which time no one shall have any cause or right of action to contest the legality, formality or regularity of the proceedings, the tax, or bond authorization, for any cause whatsoever. If the question of the validity of any proceedings, tax, or bond authorization provided for under the provisions of R.S. 47:338.30 through 338.47 is not raised within such thirty days, the authority to issue the bonds, the regularity thereof, the validity of the tax pledged and dedicated to provide for the payment of principal and interest, and the enforceability of the pledge thereof, shall be conclusively presumed, and no court may inquire into such matters. If any resolution is adopted or proceedings had more than thirty days after the publication of the resolution authorizing the issuance of bonds hereunder and pledging and dedicating the sales tax revenues, such supplemental resolution or proceedings shall be similarly published, and no contest, action or proceeding to question the validity or legality of such supplemental resolution or proceedings shall be begun in any court by any person for any cause whatsoever after the expiration of thirty days from the date on which such supplemental resolution or proceedings is published.
La. Revenue and Taxation § 47:338.46