La. Stat. tit. 13 § 3726
Where a patent for land, or the certificate of the register, or the receipt of the receiver, whether issued, or to be issued, by the officers of the State of Louisiana, or the general government has been, or may hereafter be recorded in the office of the recorder of the parish in which the land may be situated, a copy of such record properly certified by the parish recorder, shall be admissible in evidence in all causes pending before any of the courts, in the same manner, and shall be entitled to the same credit as the original of such instruments, or as exemplification thereof; provided, the party proposing to use such evidence shall make affidavit that the original of such patent or certificate is not in his possession or under his control. However, the opposite party shall be allowed to disprove the genuineness of such original or registry, as the case may be.
La. R.S. § 13:3726