70 ILCS 1215/27
No applicant for appointment in said classified service, or to a position named in the thirteenth section of this Act, shall pay or promise to pay, either directly or indirectly, any money or other valuable thing to any person whatever for or on account of his or her appointment or proposed appointment, and no officer or employee in said classified service or named in section thirteen of this Act shall pay or promise to pay, either directly or indirectly, any money or other valuable thing to any person whatever for or on account of his or her promotion or proposed promotion. Nor shall he by means of threats or coercion induce or seek to induce any one in the classified service to resign his or her position or to take a leave of absence, or any one at the head of an eligible list to waive his or her right to certification or appointment. No employee shall be given a leave of absence while under charges nor shall such leave be given as an alternative to a trial on charges.
70 ILCS 1215/27