(a) Each official establishment at which livestock or poultry are slaughtered or livestock or poultry carcasses or parts thereof, meat food products, meat by-products or poultry products are processed for intrastate commerce shall be inspected to insure that it has such premises, facilities, and equipment, and be operated in accordance with such sanitary practices, as are required by rules or regulations prescribed by the secretary for the purpose of preventing the entry into and movement in such commerce of carcasses, parts thereof, meat food products, meat by-products and poultry products which are unwholesome or adulterated. No livestock or poultry carcasses or parts thereof, meat food product or poultry products shall be admitted into any official establishment unless they have been prepared only under inspection pursuant to this act or the Federal Meat Inspection Act¹ or the Federal Poultry Products Inspection Act,² or their admission is permitted by rules or regulations prescribed by the secretary under this act.

(b) If, upon examination, it is found that any establishment, or any part of an establishment, or any equipment, is in an unclean or insanitary condition or is being conducted or used in such a manner as to make it probable that the meat or meat-food products therein or produced therein may be rendered unwholesome, or is being conducted or used in violation of this act, the agent making such examination shall report the unlawful condition to the department, and shall at the same time notify in writing, the owner, lessee, or manager of the establishment. Upon receipt of such report, the department, by its executive officer, or otherwise as it may direct, shall notify the proper owner, lessee, or manager of the result of the examination, and direct that the unlawful condition be remedied within the time specified in the notice: Provided, That the time so specified shall be not less than twenty-four hours, unless the unlawful condition mentioned in said notice is of such character and nature as, in the opinion of the department, its executive officer, or its agent, can be removed immediately. If, upon the expiration of the time specified in the notice, the condition so reported to exist shall not have been remedied, the department may order the license suspended or revoked and the establishment closed. It is unlawful to operate an establishment, or any part thereof, which has been closed and the license suspended or revoked by the department, until the unlawful condition reported to exist has been remedied to the satisfaction of the department.