No portion of the fund shall before or after the order for distribution is issued by the board of directors to the person or persons entitled thereto under the provisions of this Part, be held, seized, or levied upon, by virtue of any other process whatsoever, issued out of, or by, any court, for the payment or satisfaction in whole or in part, of any debt, damage, claim, judgment, or decree against any beneficiary of such fund, but shall be exempt therefrom. The fund shall be kept, held and distributed for no purpose other than those provided for in this Part. No present or future revision or amendments to the fund shall have the effect of reducing any benefit now in existence.
La. Consolidated Public Retirement § 11:3292