AP -- 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 comes 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 for the Tokyo Games.

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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.

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