7 Pa. Code § 1.101
Livestock suspected of having been treated with or exposed to any substance that may impart a biological residue which would make the edible tissues unfit for human food shall be identified as "Pa. Condemned." These livestock may be held under the custody of a program employe or other official designated by the veterinary supervisor until metabolic processes have reduced the residue sufficiently to make the tissues fit for human food. When the required withdrawal time has elapsed, the livestock, if returned for slaughter, shall be reexamined on antemortem inspection. To aid in determining the amount of residue present in the tissues, officials of the program may permit the slaughter of any such livestock to collect tissues for analysis of the residue.
7 Pa. Code § 1.101