a) It is unlawful for any employer to take any adverse action against an employee because the employee:

1. 1) exercises rights or attempts to exercise rights under the Act;
2. 2) opposes practices that the employee believes to be in violation of the Act; or
3. 3) supports the exercise of rights of another under the Act.

b) Exercising rights under the Act includes:

1. 1) filing an action or instituting or causing to be instituted any proceeding under, or related to, the Act;
2. 2) providing or agreeing to provide any information in connection with any inquiry or proceeding relating to any right provided under the Act; or
3. 3) testifying, or agreeing to testify, in any inquiry or proceeding relating to any right provided under the Act. [820 ILCS 154/20]