La. Stat. tit. 13 § 128
Clerks of the supreme court and the courts of appeal may participate in the benefits provided in R.S. 13:931 through 13:940 in accordance with the provisions of this Section, and in doing so, shall receive credit for any time heretofore served in any capacity in any state or parish court.
Any clerk of the supreme court or clerk of the court of appeal shall have a term of sixty days from July 30, 1952, to elect whether or not he wishes to be included in the provisions of R.S. 13:391 through 13:940; all new employees or persons given employment in said offices, whether as deputy or other employee after the enactment of this Section shall automatically participate in the benefits provided in R.S. 13:931 through 13:940 and shall be covered thereby. Deductions from salaries under this section shall begin sixty days after July 30, 1952.
La. R.S. § 13:128