Louisiana Code of Criminal Procedure Tit. II, Art. 66. Subpoena of witness to appear before attorney general and district attorney

A. Upon written motion of the attorney general or district attorney setting forth reasonable grounds therefor, the court may order the clerk to issue subpoenas directed to the persons named in the motion, ordering them to appear at a time and place designated in the order for questioning by the attorney general or district attorney respectively, concerning any offense under investigation by him. The court may also order the issuance of a subpoena duces tecum. Service of a subpoena or subpoena duces tecum issued pursuant to this Article upon motion of the attorney general may be made by any commissioned investigator from the attorney general's office, or in conformity with Article 734 of this Code.

B. The contumacious failure or refusal of the person subpoenaed to appear is punishable as a contempt of court.

C. The attorney general or district attorney, respectively, may determine who shall be present during the examination and may order all persons excluded, except counsel for the person subpoenaed.