Basically was was being put in to the pet food was pool cleaner and other chemicals! Unfortunately the FDA is so understaffed, it is almost impossible to track properly if these chemicals have made it into our food supply.
Bill Maher talked about this on his show Friday night. The man is a strict vegitarian and he is worried about the chemicals in the veggies and fruits too. So regardless if you are vegan or not, you are screwed! Figures huh?