La. Consolidated Public Retirement § 11:951.71
Creditable service shall be determined under such rules and regulations as the board of trustees shall adopt, each present employee, who rendered continuous service as a regular employee prior to the effective date of the establishment of this retirement system and who elects to become a participant, shall file a detailed statement of all such continuous service rendered by him prior to the effective date of establishment for which he claims credit.
The board of trustees shall fix and determine by appropriate rules and regulations how much service in any year is equivalent to one year of service, but in no case shall more than one year of service be creditable for all service in one calendar year, and in all cases service rendered for the full school year shall be considered one year of creditable service.
La. Consolidated Public Retirement § 11:951.71