Livestock carcasses, parts of livestock carcasses, meat, and meat food products that are slaughtered by a custom establishment shall be:

1. (1) Separated at all times from inspected livestock carcasses, parts of livestock carcasses, meat, or meat food products prepared for sale; and
2. (2) Conspicuously and plainly marked “Not For Sale” immediately after preparation and shall remain so marked until delivered to the owner.