La. Stat. tit. 13 § 4867
The plaintiff may apply to the court by motion for authority to take the testimony of the defendant or of any other person residing outside the parish in which the action is pending, or residing in the parish physically unable to attend court, orally or in response to written interrogatories filed with the motion. The defendant may, within three days after service of the interrogatories on him, take a rule on the plaintiff to strike out any interrogatory to which he objects, and the commission to take the testimony shall not be issued until after the rule has been passed upon by the court. At the taking of testimony orally under a commission the defendant may object to any question or to the introduction of any document, and the officer shall note the objection as part of the proceedings before him. The defendant shall not be permitted to propound written interrogatories or to question any witness where the testimony is being taken orally. Except as otherwise provided in R.S. 13:4861 through 13:4875, the provisions of law with respect to the taking of testimony under commission in other actions shall govern the taking of testimony in actions for discovery and investigation.
La. R.S. § 13:4867