Pesticides and related chemicals are licensed for controlling weeds, pests, and moulds in crops with the understanding that they will be used according to Good Agricultural Practice (GAP) guidelines. Similarly, veterinary drugs are authorised for use in food animal production with the understanding that they will be used according to Good Veterinary Practice (GVP) guidelines. But, even under GAP and GVP, residues of these chemicals have been found in foods of plant and animal origin and the ques