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It's bad enough that about 12 million potentially toxic "Shrek" drinking glasses were recalled by McDonald's last week.

But what should really get people's alarm bells ringing is the fact that nobody seems to know, or is willing to say publicly, how the carcinogenic metal cadmium got into paint used to depict Shrek, Donkey and other characters.

Worse, federal law allows cadmium to be in a product marketed to children as long as the product isn't a toy, raising questions as to how many other goods may be out there that also pose a health risk.