La. Stat. tit. 33 § 1232
When the police jury has elected a vice-president pursuant to its authority under R.S. 33:1226, the vice-president shall have all the powers and perform all the duties required by law of the president whenever the president does not attend. If the police jury has not elected a vice-president under R.S. 33:1226, whenever the president does not attend, the police jury shall appoint a president pro tempore, from among themselves, who shall have all the powers and perform all the duties required by law of the president. If the police jury has elected a vice-president under the provisions of R.S. 33:1226, whenever the president and vice-president do not attend a duly called meeting of the police jury and there is a quorum of the police jury in attendance, the police jury shall appoint from among themselves, for that meeting only, a president pro tempore who shall have all the powers and perform all the duties required by law of the president.
La. R.S. § 33:1232