The commissioner shall appoint inspectors to inspect animals, whole or parts of carcasses, poultry, poultry food products, meat, and meat food products the inspection of which is provided for by law, and the sanitary conditions of all establishments in which the poultry, poultry food products, meat, and meat food products are prepared. Inspectors shall refuse to stamp, mark, tag, or label a whole or part of a carcass or a meat food product derived from it, prepared in an establishment covered by sections 31A.01 to 31A.12, until it has actually been inspected and found to be not adulterated. Inspectors shall perform other duties required by this chapter or by rules adopted by the commissioner that are necessary for the efficient execution of this chapter. Inspections under this chapter must conform to the rules adopted by the commissioner consistent with this chapter.