40 ILCS 5/17-150
Until July 1, 2000, pension payments, exclusive of those made to the survivors of persons who were contributors, shall be suspended while the recipient is employed in a teaching capacity, outside the City in which the Fund exists, by any public school or charter school in this State, unless the recipient is so employed temporarily as a substitute teacher for 100 days or less in a school year or on an hourly basis with earnings not in excess of the sum payable for 100 days' substitute service.
Beginning July 1, 2000, pension payments shall no longer be suspended while the recipient is employed in a teaching capacity, outside the City in which the Fund exists, by any public school or charter school in this State, and any pension that is in a state of suspension under this Section on July 1, 2000 shall be reinstated on that date. Notwithstanding Section 17-157, the change to this Section made by this amendatory Act of the 91st General Assembly applies without regard to whether or not the pensioner was in service on or after the effective date of this amendatory Act.
40 ILCS 5/17-150