(40 ILCS 5/1-103.1)
(from Ch. 108 1/2, par. 1-103.1)
Application of amendments.
Amendments to this Code which have been or may be enacted shall be
applicable only to persons who, on or after the effective date thereof, are
in service as an employee under the retirement system or pension fund
covered by the Article which is amended, unless the amendatory Act
(Source: P.A. 77-1415.)