Any person who desires to have his laboratory approved by the commissioner for determining the vitamin D level in milk samples taken under the supervision of the commissioner, as herein provided, shall first satisfy the commissioner that tests to be made in such laboratory will be conducted by persons qualified by training, experience and facilities to make such tests accurately. Laboratories operated and maintained by those persons who thus satisfy the commissioner shall be designated “Approved Laboratories”.

For the purpose of determining whether or not a laboratory shall be designated as an “approved laboratory” the commissioner may designate a qualified person or persons to examine the laboratory, its equipment, facilities and personnel, at the expense of the applying laboratory, and thereafter may have similar examinations made at the expense of the applying laboratory for the purpose of determining whether or not such approval should be continued.

The approval of a laboratory for determining the vitamin D level in milk may be withdrawn by the commissioner if he is satisfied that the laboratory, its facilities or personnel are not suitable for making accurate determinations of the vitamin D level of milk.