Any carcass, part of a carcass, meat or meat food product of livestock, or article exempted from the definition of meat food product, or any dead, dying, disabled, or diseased livestock is subject to detention for a period not to exceed 20 days when found by any authorized representative of the Secretary upon any premises where it is held for the purposes of, or during or after distribution in, commerce or it is otherwise subject to Title I or II of the Act, and there is reason to believe that:
9 C.F.R. § 329.1