'Eating pork can lead to a false positive' - US runner blames burrito for four-year ban

"I have since learned that it has long been understood by Wada (World Anti-Doping Agency) that eating pork can lead to a false positive for nandrolone, since certain types of pigs produce it naturally in high amounts. Pig organ meat (offal) has the highest levels of nandrolone," she said.