for Veterinary Medicine, said that melamine turning up in exported Chinese wheat gluten, rice protein concentrate and corn gluten supports theories of intentional adulteration. "That will be one of the theories we will pursue when we get into the plants in China." On 29 April 2007 and 30 April 2007, the International Herald Tribune and The New York Times reported that some animal feed manufacturers in China admit to having used melamine scrap in animal feed for years. Said Ji Denghui, general manager of the Fujian Sanming Dinghui Chemical Company: “Many companies buy melamine scrap to make animal feed, such as fish feed. I don't know if there’s a regulation on it. Probably not. No law or regulation says 'don’t do it,' so everyone's doing it. The laws in China are like that, aren't they? If there’s no accident, there won’t be any regulation.” Such use of "melamine scrap", described as left over from processing of coal into melamine for use in creating plastic and fertilizer, was described as widespread. Melamine is said to have been chosen in order to inflate crude protein content measures and to avoid tests for other common and illegal ingredients, such as urea. As of 2 May 2007, officials of the USDA and FDA still do not know who manufactured the contaminated food or where the contamination took place. The Chinese government has said that Xuzhou Anying, for instance, purchased its products from 25 different manufacturers. On 8 May 2007, The International Herald Tribune reported that three Chinese chemical makers have said that animal feed producers often purchase, or seek to purchase, the chemical, cyanuric acid, from their factories to blend into animal feed to give the false appearance of a higher level of protein, suggesting another potentially dangerous way that melamine and cyanuric acid might combine in protein products. The same day, FDA officials revealed that the vegetable proteins were not only contaminated, but mislabeled. Both the wheat gluten and rice protein concentrate were actually wheat flour, a much cheaper product from which wheat gluten is extracted. The addition of nitrogen-rich compounds were necessary to make the flour test as if it were protein extract. Dairy On 11 September 2008, fresh reports of massive outbreak of melamine contamination found in China led to recall of infant formula products in China. Some Chinese reports said the manufacturer of the milk products might not have consciously