Any carcass, part of a carcass, meat or meat food product of livestock, or article exempted from the definition of meat food products, or any dead, dying, disabled or diseased livestock shall be subject to retention for a period not to exceed 20 days when found by any authorized representative of the Department upon any premises where it is held for the purposes of or during or after distribution in commerce or it is otherwise subject to the act, and there is reason to believe that:
7 Pa. Code § 1.571