(1) Nothing in this chapter or in any apprenticeship or on-the-job training agreement approved under this chapter shall operate to invalidate:
(a) Any apprenticeship or on-the-job training provision in any collective agreement between employers and employees setting up higher standards; or (b) Any special provision for veterans, minority persons, or women in the standards, apprentice qualifications, or operation of the program, or in the apprenticeship agreement, which is not otherwise prohibited by law, executive order, or administrative regulation.
(2) None of the terms or provisions of this chapter shall apply to any person, firm, corporation, or occupation, unless such person, firm, corporation, or occupation voluntarily elects that the terms and provisions of this chapter shall apply.