40 ILCS 5/8-166
An employee who was not in the service of an employer on the day prior to the effective date, and who was in service prior to that date, who re-enters service after that date and before age 65, shall not be credited for prior service annuity or widow's prior service annuity on account of service prior to the effective date. The period of service, prior to the effective date shall, however, be included in computing service for age and service annuity and widow's annuity. Such employee shall be a future entrant for the purposes of this Article.
For any person employed by an employer prior to January 1, 1950, from whose salary deductions were made for the purposes of this Article for the first time after December 31, 1949, any service rendered prior to January 1, 1922, unless he was in service on the day before the effective date, shall not, regardless of any other provisions of this Article, be counted as service for the purposes of this Article.
Contributions by the employee to whom this section applies, and city contributions for age and service annuity and widow's annuity, shall be made as herein provided.
Any person employed by an employer or retirement board, in which this Article was in force prior to January 1, 1950, who (1) was not a participant in this fund on January 1, 1950, (2) attained age 65 before July 1, 1950 and (3) fails to qualify as an employee by virtue of the 12 months' service requirement by July 1, 1950, shall not be credited for any annuity purposes under this Article; nor shall any other person so employed, who attains age 65 or more subsequent to July 1, 1950, and before qualifying as an employee, be credited for any annuity purposes under this Article. Such person shall not be considered an employee.
40 ILCS 5/8-166