20 ILCS 415/12d
Any person holding a position in State service subject to the jurisdiction of the Department of Central Management Services, who is elected to State office in the State of Illinois, shall, upon request, be granted a leave of absence, without pay, from such position. Any employee of the Department of Corrections shall, upon request, be granted a leave of absence, without pay, to serve in an elected law enforcement position, including employees who were elected in 1994 or any subsequent year. Such leave of absence shall continue so long as he remains an elected State officer or in the elected law enforcement position and for a period of 30 days thereafter. If such person files a written request to reenter active State service within such 30 day period with the officer legally charged with control over appointments to positions in the department, board, commission, institution or other agency from which the leave of absence was obtained, he shall be reinstated in his former position if such position exists; if such former position has been abolished and the duties thereof are being substantially performed by a person assigned to a different position or classification, the applicant for reinstatement shall be assigned to such different position or classification; if such former position has been abolished and the duties assigned thereto are not otherwise being substantially performed, such applicant shall be reemployed in a position equal in rank to that which he held prior to his leave of absence and requiring the performance of similar duties, otherwise his leave of absence shall cease.
Any person heretofore granted a leave of absence to serve as an elected State Officer and who is on such leave of absence on the effective date of this Act shall be continued on such leave of absence under the same conditions as set forth in the first paragraph of this Section.
The provisions of this Section shall not be applicable to or affect any employee in any position in an activity or program financed in whole or in part by loans or grants made by the United States or by any Federal agency.
20 ILCS 415/12d