A public sector employer may not retaliate against a public sector employee who:
(1) contacts the department with a complaint of a violation of a standard in the workplace;
(2) cooperates with the department in the performance of an inspection or an investigation; or
(3) testifies or cooperates with the department in any case arising out of:
(a) an inspection;
(b) an investigation;
(c) a citation;
(d) a temporary stop-work order; or
(e) a civil action seeking injunctive relief.