How would melamine get into pet food?
It appears that melamine was introduced through wheat gluten from a specific supplier from China. The FDA announced, during their press conference of March 30, 2007, that their investigation had not identified any violations at either of the Emporia, Kansas or the Pennsauken, New Jersey facilities of Menu Foods. The FDA also announced that they did not find melamine in any of non-recall impacted samples of finished product or raw materials.