La. Stat. tit. 33 § 1405
The provisions of this section shall be applicable to officers of political subdivisions including but not limited to municipalities, parishes, and special districts not included in R.S. 33:1404. Such officers, subject to such regulations as the executive head or heads of the political subdivision may issue, shall upon approval of this Part, designate by title, if feasible, or by named person, emergency interim successors and specify their order of succession. The officer shall review and revise, as necessary, designations made pursuant to this Part to insure their current status. The officer will designate a sufficient number of persons so that there will be not less than three nor more than seven deputies or emergency interim successors, or any combination thereof, at any time. In the event that any officer of any political subdivision or his deputy provided for pursuant to law is unavailable, the powers of the office shall be exercised and duties shall be discharged by his designated emergency interim successors in the order specified. The emergency interim successors shall exercise the powers and discharge the duties of the office to which designated until such time as a vacancy which may exist shall be filled in accordance with the constitution or statutes, or until the officer or his deputy or a preceding emergency interim successor again becomes available to exercise the powers and discharge the duties of his office.
La. R.S. § 33:1405