In 2007, pet food that was contaminated with melamine and related compounds made many pets sick. At first, no one knew what caused the problem. An intense and sophisticated search for the cause was begun. In many ways, the work done by scientists in government and the pet food industry was groundbreaking. In this video, Dr. Renate Reimschuessel of the Food and Drug Administration explains what it took to uncover and confirm the presence of the adulterants in pet food.