La. Stat. tit. 38 § 1591
Current with changes from the 2024 legislative session effective on or before 7/1/2024, from Acts 1-3, 6-671
Drainage certificates issued hereunder shall be deemed to possess all the legal requisites of negotiable paper, shall not be invalid for any irregularity or defect in the proceedings for their issuance, sale, or delivery, and shall be incontestable in the hands of bona fide purchasers or holders for value thereof.
La. R.S. § 38:1591