The director by regulation may establish permissible tolerances for any pesticide chemical in or on produce if he or she finds each of the following:

The director may exempt any pesticide chemical from the requirement of a tolerance if he finds that the pesticide chemical may safely be used without a tolerance.

The director may establish the tolerance for any pesticide chemical on produce at zero if he finds that a greater tolerance is not justified.

If a tolerance for a pesticide chemical in or on produce is established pursuant to any law of the United States, the director may review the tolerance, and if he finds that it is in accordance with the standards and provisions of this chapter, he may establish a like tolerance pursuant to this chapter.