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7. The veterinarian prescribed gentamicin for extra-label use in a lactating dairy
cow within a valid VCPR. The gentamicin product was labeled in accordance
with the PMO requirements. The veterinarian assigned a slaughter
withdrawal time of 10 days. The farmer held the cow for 12 days after
treatment, then shipped it for slaughter. A gentamicin residue was detected
by USDA. Is this situation within the provisions of the extra-label use
regulations?
8. A veterinarian prescribed a prescription drug for treatment of mastitis. The
drug was purchased on several occasions from a mobile peddler and labeled
in accordance with the PMO for mastitis use. The veterinarian did not assign
an expiration date to the prescription or the drug. The farmer used the drug
on a cow with pneumonia. Is the veterinarian responsible?
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