Walter Hammack is an Environmental Manager with the Florida Department of Agriculture, Division of Food Safety, Chemical Residue Laboratory. The Chemical Residue Laboratory is an ISO 17025 accredited laboratory for pesticide analysis and is a member of the USDA Pesticide Residue Program (PRP) and the Food Emergency Response Network (FERN). Walter is the section lead for LC/MS and Food Defense. He has expertise in both LC and GC, as well as mass spectrometry. Walter has worked on numerous high profile food safety projects during his career, including, chloramphenicol and more recently, melamine in human food. Walter graduated from Valdosta State University in 1988 with a B.S. in Chemistry and has been with the Florida Department of Agriculture as a chemist for 22 years. Walter is a member of AOAC, and is a certified M.L.T with the American Society for Clinical Pathology.