La. Stat. tit. 9 § 2923
When preparing a certificate as provided in R.S. 9:2922, the certifying officer shall examine and report the condition of the tax rolls for thirty years prior to January first of the year in which the certificate is applied for and in the case of local improvement assessments, for ten years prior to January first of the year and for future years during which installments for such charges may become due, reserving to the municipal corporation recourse against its collectors and deputy collectors and their bondsmen for any losses it may sustain by reason of any errors made in the certificate.
The tax certificates shall indicate whether or not the current taxes have been paid, and shall indicate for each separate year the method by which the taxes have been paid or considered paid, whether by the tax debtor, by tax sale, or by any other manner.
The municipal corporation shall fix by ordinance the price to be charged for research certificate.
La. R.S. § 9:2923