La. Civ. Code art. 1624
Current with operative changes from the 2024 Third Special Legislative Session
The testator shall express in the instrument the reason, facts, or circumstances that constitute the cause for the disinherison; otherwise, the disinherison is null. The reason, facts, or circumstances expressed in the instrument shall be presumed to be true. The presumption may be rebutted by a preponderance of the evidence, but the unsupported testimony of the disinherited heir shall not be sufficient to overcome the presumption.
La. C.C. § 1624