La. Consolidated Public Retirement § 11:952.12
Each employee on the effective date of the funded system, who is a member of the nonfunded university retirement plan and who is covered in such employment under the Federal Social Security Act shall become a member of the funded University Retirement System as of that date and authorize the deduction of contributions required under the funded system, unless he elects not to become a member and thereby remain a member of the nonfunded university retirement plan, by executing and filing with the board of supervisors the appropriate form provided by it within one hundred and eighty days following the effective date of the funded system. Any employee on authorized leave of absence when his election would otherwise need to be filed shall file such election within ninety days after he returns to active service. An employee who elects not to become a member as aforesaid may, nevertheless, later become a member as of the first day of the calendar month next following approval of his written application therefor filed with the board of supervisors, but he shall receive no credit under the funded system for service rendered prior to the time he becomes a member unless the board of supervisors permits the employee to make a lump sum payment in the amount he would have contributed plus appropriate interest, in which case his membership shall include such period of service.
La. Consolidated Public Retirement § 11:952.12