(a) The provisions of this article shall not be construed to require an employer to compensate an employee for participation in an investigation, hearing, or inquiry held by an appropriate authority or impair the rights of any employee covered by the civil service system to be a member of an organization of employees or to refrain from being a member of an organization of employees.
(b) Except when on duty or acting in an official capacity, and except where otherwise prohibited by state or federal law, no employee covered by the civil service system may be prohibited from engaging in political activity or be denied the right to refrain from engaging in political activity.