What's the third contaminant? So far I've read about the drug and the melamine.
What makes me wonder is why we can't produce enough wheat gluten here in the USA. Do we not export lots of wheat?
It looks like the wheat supply in the US is tighter than China's for the past year. Their yield was up I guess and their demand levelling off, so they had cheaper wheat to export.
Aminopterin Confirmed in Recalled Pet Food and Implicated Tissue Samples.
http://www.agmkt.state.ny.us/AD/release.asp?ReleaseID=1598
FDA Issues Warning Letter to Iams Pet Food - Chromium Tripicolinate
http://www.freerepublic.com/^http://www.fda.gov/foi/warning_letters/b6285d.htm