"I don't understand it either," she wrote. "I don't believe in anything anymore. In no tests. No games. It's a big joke for me."
Three-time U.S. Olympic bobsled medalist Elana Meyers Taylor also tested positive after arriving in Beijing and had to isolate, but has since been cleared to compete. Meyers Taylor told USA TODAY Sports she did everything she could in her tiny room to prepare for the first monobob heats that begin Feb. 13. She did squats and lifted weights and sprinted from one end of the room to the other to mimic the start of a race.