Rat Poison Cited In Pet Food Recall Wheat From China Contaminated, Lab Says POSTED: 10:52 am EDT March 23, 2007 Email This Story | Print This Story A spokeswoman for the New York state Department of Agriculture and Markets said Friday that rodent poison was found in tainted pet food that killed several animals and sparked a nationwide recall. A spokeswoman did not identifying the chemical or its source, beyond saying that it's rodent poison. State officials will be releasing laboratory findings later today. A news conference is expected at 1 p.m. EDT. ABC News reported that the chemical was aminopterin, which was on wheat imported from China. Various online medical sources indicate that aminopterin is also used in trials to treat leukemia. Sixteen animal deaths led to the recall of 60 (m) million cans and pouches of pet food sold throughout North America under 95 brand names.
http://www.nbc10.com/family/11346835/detail.html?dl=mainclick
The above is the sum total of what I have read (including the link).