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Riedstra Dairy, Ltd., a Michigan dairy farm, was warned for selling an animal for slaughter that contained illegal drug residues exceeding FDA safety limits. During a September-November 2021 inspection, the FDA found that the company sold a cow with desfuroylceftiofur residues at 0.568 ppm in kidney tissue, which exceeded the established safe tolerance of 0.4 ppm for this ceftiofur metabolite. This violation rendered the animal's tissue adulterated under the Federal Food, Drug, and Cosmetic Act, as the drug residue levels posed a potential safety risk to consumers.