La. Consolidated Public Retirement § 11:3636
Six percent of salaries of officers, members, and employees of the police department, who are paying contributions into the pension system, shall be turned over and paid to the board. Except as hereafter provided, this levy shall be deducted and collected monthly out of the salaries and paid into the fund, provided that monies received as overtime pay, court overtime pay, and holiday overtime pay shall not be considered as salary for pension fund purposes. Any member employed prior to January 1, 1968, upon reaching eligibility for minimum service retirement, shall no longer have said deductions collected, nor shall he be liable therefor. Any member employed after December 31, 1967, upon reaching eligibility for minimum service retirement, and who has at least twenty years of service credit shall no longer have said deductions collected, nor shall he be liable therefor.
La. Consolidated Public Retirement § 11:3636