The head, tail, tongue, thymus gland, and all viscera of each slaughtered animal, and all blood and other parts of the animal to be used in the preparation of meat food products or medical products, shall be handled in a manner as to identify them from the rest of the carcass and as being derived from the particular animal involved, until the postmortem examination of the carcass and parts thereof has been completed.
Okla. Admin. Code § 35:37-11-45