(a) Except as provided by subsection (b) of this section, livestock suspected of having been treated with or exposed to any substance that may impart a biological residue that would make the edible tissues unfit for human food or otherwise adulterated shall be handled in compliance with the provisions of this paragraph. They shall be identified at official establishments as California Condemned by an inspector. These livestock may be held under the custody of a program employee or other official designated by the Department until metabolic processes have reduced the residue sufficiently to make the tissues fit for human food and otherwise not adulterated. When the required time has elapsed, the livestock, if returned for slaughter, must be re-examined on ante-mortem 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 for collecting tissues for analysis for the residue. Such analysis may include the use of in-plant screening procedures designed to detect the presence of antimicrobial residues in any species of livestock.

(b) All carcasses and edible organs and other parts thereof, in which are found any biological residues that render such articles adulterated, shall be marked and tagged by an inspector as California Condemned and disposed of in accordance with Article 8 of this subchapter.

(c) The names of all persons who sold or consigned each swine to the establishment shall be made available by the establishment to any program employee or other authorized employee of the Department upon that employee's request and presentation of his official credentials. Swine identification, by means approved by the Animal and Plant Health Inspection Service, USDA, shall be maintained throughout post-mortem inspection, in accordance with 9 CFR section 310.23 (2006).