La. Stat. tit. 2 § 9
The secretary or any person designated by the secretary may hold investigations, inquiries, and hearings concerning matters covered by the provisions of this Chapter, and all accidents in aeronautics, except for aircraft registration, identification, equipment, and enforcement delegated to the Department of Public Safety and Corrections. All hearings conducted in accordance with the provisions of this Section shall be open to the public. The secretary, and every person designated by him to hold any inquiry, investigation, or hearing may administer oaths and affirmations, certify to all official acts, issue subpoenas, compel the attendance and testimony of witnesses, and the production of papers, books, and documents. In case of failure to comply with any subpoena or order issued under authority of this Chapter, the secretary or his authorized representative, may invoke the aid of any district court which may have jurisdiction in such cases. The court may thereupon order the witness to comply with the requirements of the subpoena or order to give evidence touching the matter in question. Any failure to obey the order of said court may be punished by the court as a contempt thereof.
La. R.S. § 2:9
SEE ACTS 1985, NO. 889, §3.