So if I'm reading that article correctly, what appears to have happened is that melamine has been added to gluten products in China for years. And it's gone unnoticed because melamine alone didn't produce sudden death (although who knows whether it has contributed to chronic kidney problems).

But someone apparently got extra greedy and decided to also add cyanuric acid as well. And the combination of melamine and cyanuric acid is lethal.

And now everyone's passing the buck like mad. But the U.S. manufacturers have no excuse for failing to test their ingredients. All they cared about was that they could buy the ingredients cheaply and turn a fat profit.