R.S. 11:3514 and 3516 shall not affect the rights acquired by members of police departments employed prior to 12 o'clock noon, July 28, 1948, and shall not affect their right to retirement after twenty years of service, and employees of police departments of municipalities coming under this law by reason of population increases shall have the same benefits granted herein if such employees were employed prior to 12 o'clock noon, July 28, 1948.
La. Consolidated Public Retirement § 11:3517