Yes I do believe they now know what is going on....
But the fact remains that many major companies purchased some of the grain from a major grain supplier in China and then distributed that grain and grain products to smaller companies to use in there products...
I think the latest recall was on May 11 (Royal canine)...
There are many companies that purchase this grain that have yet to be disclosed...
Some that have been affected by this product are treats (jerkys) and many major dog and cat food brands including generic and smaller company brands...
At first it was thought to be in a few brands, but the truth is it is in many many brands...
Check the list for more ideas , You will probably be surprized...
http://www.fda.gov/oc/opacom/hottopics/petfood.html