Louisiana Code of Criminal Procedure Tit. XXIX, Art. 856. Motion to urge all available grounds; exceptions

A motion for a new trial shall urge all grounds known and available to the defendant at the time of the filing of the motion. However, the court may permit the defendant to supplement his original motion by urging an additional ground, or may permit the defendant to file an additional motion for a new trial, prior to the court's ruling on the motion.