Shelby Houlihan, the American record holder in the 1,500 and 5,000 meters, posted on social media that she's been banned for four years following a positive test for what she concluded was a tainted pork burrito.
Houlihan's announcement on her Instagram account Monday arrives days before the start of U.S. Olympic track and field trials in Eugene, Oregon, where the top three in each event earn a spot to the postponed Tokyo Games. She finished 11th at the 2016 Rio de Janeiro Olympics in the 5,000 meters.
The 28-year-old Houlihan said she received an email from the Athletics Integrity Unit (AIU) on Jan. 14, notifying her that a drug testing sample returned a finding for the anabolic steroid nandrolone. She said she's since learned 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."
Houlihan made a list of all the food she ate leading up to a Dec. 15 test that produced the adverse analytical finding for the anabolic steroid.
"We concluded that the most likely explanation was a burrito purchased and consumed approximately 10 hours before that drug test from an authentic Mexican food truck that serves pig offal near my house in Beaverton, Oregon," Houlihan wrote. "I notified the AIU that I believed this was the source."