(2) Notwithstanding subsection (1) of this section, it is not an unlawful employment practice for an employer to require the payment of medical examination or health certificate costs:
(a) From health and welfare fringe benefit moneys contributed entirely by the employer; or
(b) By the employee if the medical examination or health certificate is required pursuant to a collective bargaining agreement, state or federal statute or city or county ordinance. [Formerly 659.330]