According to the FDA's head vet guy I saw on CNN this morning, one possibility they're looking at is that the gluten was deliberately adulterated with the melamine in order to (somehow) raise the gluten's protein content, which in turn (IIRC) would raise the price Chem Nutra could get for the gluten.
If that's what happened, I don't know how in Hades that could be accidental.
Interesting information. Thank you. It is interesting what the vet had to say.
About 9 months ago, the Republic of Panama purchased some poisoned cough syrup. It contained coolant. The syrup came from a pharmaceutical house in Spain, which in turn had purchased the ingredient containing the poison from China. Many folks died.