The built-in pesticide has been integrated into certain GM crops to ward off pests. Bt corn, for instance, has actually been designed to produce the toxin directly inside its kernels, which are later eaten by both livestock and humans. The new study shreds the false notion that Bt is broken down by the digestive system, and instead shows that the toxin definitively persists in the bloodstream. http://www.naturalnews.com/032407_Bt_insecticide_GMOs.html