EPA nixed StarLink because the agency couldn't rule out the possibility that people might be allergic to it. The evidence for allergy wasn't strong --- the offending protein, called Cry9C, isn't quickly digested so the body has more time to react to it --- but there was enough doubt to ban human consumption. Even more worrisome, 51 people reported getting ill after eating corn products. Scientists were skeptical because StarLink levels were minuscule and the corn had been around only a short time.
Still, the FDA asked the Centers for Disease Control and Prevention in Atlanta to test people who claimed the corn made them sick. From the 51 reports, CDC culled 28 people with symptoms fitting a real food allergy, then analyzed blood samples from 17 of them.
The results, reported on June 11, were striking. None of the samples contained antibodies to Cry9C protein. That's important because if the body doesn't make antibodies, it won't start the chain of events leading to allergy. In other words, although some people got sick after eating StarLink corn, it almost certainly wasn't from the biotech protein. An independent laboratory confirmed CDC's results.