(a) Nothing in this article or in any professional employer agreement affects, modifies or amends any collective bargaining agreement, or the rights or obligations of a client-employer, PEO or covered employee under the Federal National Labor Relations Act, the Federal Railway Labor Act or article one-a, chapter twenty-one of this code.
(b) Notwithstanding any other provision of this article, nothing in this article or in any professional employer agreement:
(1) Diminishes, abolishes or removes rights of covered employees as to a client-employer or obligations of a client-employer to covered employees, including but not limited to rights and obligations arising from civil rights laws guaranteeing nondiscrimination in employment practices;
(2) Affects, modifies, or amends any contractual relationship or restrictive covenant between a covered employee and a client-employer in effect at the time a professional employer agreement becomes effective; or
(3) Prohibits or amends or any contractual relationship or restrictive covenant that is entered into subsequent to the effective date of a professional employer agreement between a client-employer and a covered employee.