(a) On the request of an employer, the department or the department's representative, or the local health authority or the local health authority's representative, a person employed or seeking employment in an activity regulated under Section 438.032:
(1) shall be examined by a licensed physician; and
(2) must receive a certificate signed by the physician stating that the examination has been performed and that to the best of the physician's knowledge the person examined did not have on the date of the examination a transmissible condition of a communicable disease or a local infection commonly transmitted through the handling of food.
(b) The examination must be actual and thorough and conducted with practical scientific procedures to determine the existence of a communicable disease that may be transmitted through the handling of food.