320 ILCS 20/4.1: Employer discrimination.

No employer shall discharge, demote or suspend, or threaten to discharge, demote or suspend, or in any manner discriminate against any employee: (i) who makes any good faith oral or written report of suspected abuse, abandonment, neglect, or financial exploitation; (ii) who makes any good faith oral or written report concerning information about the suspicious death of an eligible adult; or (iii) who is or will be a witness or testify in any investigation or proceeding concerning a report of suspected abuse, abandonment, neglect, or financial exploitation.