For the purpose of enforcing this chapter, including but not limited to the provisions on licensing, setting of minimum prices and quotas, the board of agriculture or any of its authorized employees may enter at all reasonable hours all places within the State where milk is being produced, sold, stored, processed, or containerized, or where the books, papers, records, or documents relating to such transactions are kept, and shall have power to inspect and copy the same. It may administer oaths and take testimony for the purpose of ascertaining facts which in its judgment are necessary to administer this chapter.