(WVLT) - The government is exploring the theory that imported ingredients in some pet food may have been intentionally spiked with an industrial chemical to make them appear to have a higher protein content.
The Food and Drug Administration is looking into how the chemical, melamine, contaminated at least two ingredients used in more than 100 brands of dog and cat food.
Those foods were linked to kidney problems in animals and were the center of a massive recall.
Melamine has been found in both wheat gluten and rice protein concentrate imported from China.
Federal investigators say they are waiting for visas so they can go and inspect the plants where the vegetable proteins were produced.
For the latest on the FDA recall, go to this website.