A team of doctors at the Department of Obstetrics and Gynecology at the University of Sherbrooke Hospital Centre in Quebec, Canada looked at the prevalence of Bt toxins in female patients, finding that the chemicals — which are often implanted into GMO crops including corn — were found in the majority of those who were surveyed. Those who were pregnant at the time of the survey, 93 percent of them had traces of Bt toxin in their blood, and 80 percent of their umbilical cords contained the chemical.