5 ILCS 430/15-10

An officer, a member, a State employee, or a State agency shall not take any retaliatory action against a State employee because the State employee does any of the following: (1) Discloses or threatens to disclose to a supervisor or to a public body an activity, policy, or practice of any officer, member, State agency, or other State employee that the State employee reasonably believes is in violation of a law, rule, or regulation. (2) Provides information to or testifies before any public body conducting an investigation, hearing, or inquiry into any violation of a law, rule, or regulation by any officer, member, State agency, or other State employee. (3) Assists or participates in a proceeding to enforce the provisions of this Act.