La. Consolidated Public Retirement § 11:1517
Any person who was eligible for membership in the fund but was not enrolled for whatever reason may receive credit for the time such person was otherwise eligible for membership. The clerk for whom the person was employed must certify the inclusive dates of employment and the salary earned by the member during these dates, or the person shall submit such other evidence in lieu thereof as shall be requested by the board. The person, the clerk for whom the person was employed, and any other person submitting evidence on his behalf, shall certify all evidence by an affidavit in authentic form. Should any facts or evidence not be true which would disqualify him from benefits, the person shall lose all rights to any benefits from the system. In order to receive such credit the person shall pay to the system an amount which, on an actuarial basis, totally offsets the increase in accrued liability of the fund resulting from the receipt of the credit. The amount payable shall be calculated by use of the actuarial funding method, assumptions, and tables in use by the fund at the time of application for credit. No credit shall be given until the payment is paid in full.
La. Consolidated Public Retirement § 11:1517