Louisiana Code of Criminal Procedure Tit. XXV, Art. 734. Service of subpoena by sheriff; investigators

A. The sheriff of any parish in which the witness may be found or of the parish in which the proceeding is pending shall serve the subpoena and make a return thereof without delay.

B. When the attorney general is involved in the conduct of a criminal case, investigators who are employed by the attorney general and who are commissioned law enforcement officers may serve any subpoena or subpoena duces tecum which is issued in that case. If an investigator who is employed by the attorney general serves a subpoena or a subpoena duces tecum under this Article, the investigator shall execute the return of service provided for in Article 736.

C. When the district attorney is involved in the investigation or prosecution of a criminal case, investigators who are employed by that district attorney and who are P.O.S.T. certified commissioned law enforcement officers may serve any subpoena or subpoena duces tecum which is issued in that case. Each investigator who serves a subpoena or subpoena duces tecum under the provisions of this Article shall execute the return of service required by Article 736.