La. Stat. tit. 15 § 432
A legal presumption relieves him in whose favor it exists from the necessity of any proof; but may none the less be destroyed by rebutting evidence; such is the presumption attaching to the regularity of judicial proceedings; that the grand jury was legally constituted; that public officers have done their duty; that a relation or subject-matter once established, continues, but not that it pre-existed; that the defendant intended the natural and probable consequence of his act; that the defendant is innocent; that the defendant is sane and responsible for his actions; that the person in the unexplained possession of property recently stolen is the thief; that evidence under the control of a party and not produced by him was not produced because it would not have aided him; that the witnesses have told the truth.
La. R.S. § 15:432