Officials: Pet Food Poison May Have Been Intentional

FDA Investigators Say Chinese Companies May Have Added Melamine to Appear to Boost Protein Content For the first time, investigators are saying the chemical that has sickened and killed pets in the United States may have been intentionally added to pet food ingredients by Chinese producers. Food and Drug Administration investigators say the Chinese companies may have spiked products with the chemical melamine so that they would appear, in tests, to have more value as protein products. Officials now suspect this possibility because a second ingredient from China, rice protein concentrate, has tested positive for melamine. So has corn gluten shipped to South Africa. That means there is a possibility for another round of recalls.