La. Code Civ. Proc. art. 2824
Current with changes from the 2024 legislative session effective on or before 7/1/2024, from Acts 1-3, 6-671
No fact which is an issue in a contradictory proceeding in a succession may be proved by affidavit under Articles 2821 and 2822. In all such contradictory proceedings, issues of fact shall be determined on the trial thereof only by evidence introduced as in ordinary cases.
La. C.P. § 2824