La. Stat. tit. 51 § 144
The order for examination shall be signed by the judge making it, and the service of a copy with an endorsement signed by the Attorney General or district attorney that the person named shall appear and be examined at the time and place and before the officer specified in the endorsement, shall be sufficient notice for the attendance of witnesses.
The endorsement may require the person to produce on examination all books, papers and documents in his possession or under his control, relating to the subject of such examination. The production of books and papers for inspection shall be subject to the order of the judge who has ordered the examination; and either party may, by a petition, ask that the judge pass on the questions as to whether or not the books or papers should be produced, examined, and introduced in evidence.
La. R.S. § 51:144