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Knobbe Cattle Company Inc., a cattle feedlot operation, was found to have offered an adulterated animal for human consumption when it sold a beef cow for slaughter that contained illegal drug residues. USDA/FSIS testing identified ceftiofur metabolite residues at levels exceeding the FDA's established tolerance of 0.4 ppm in kidney tissue, rendering the resulting food unsafe. The violation occurred because an employee failed to review treatment records before the animal was shipped for slaughter, a failure the company addressed through employee retraining and disciplinary action.