The director may appoint auditors familiar with the purchase, sale, and handling of grain and knowledgeable with respect to sections 276.401 to 276.581 and regulations promulgated hereunder to investigate, audit, and inspect persons as authorized by sections 276.401 to 276.581 and the regulations promulgated hereunder. It shall be the duty of employees of the Missouri highway patrol and weighing station employees to cooperate with the director in the enforcement of sections 276.401 to 276.581.