LONDON -- St. Kitts & Nevis sprinter Tameka Williams has been sent home from the London Olympics by her team for a potential drug violation.
St. Kitts Olympic committee vice president Dennis Knight tells the Associated Press that Williams had been using a substance which was "clearly outside the medical code."
Knight says Williams had not tested positive, but the team acted after consulting with the World Anti-Doping Agency.
He says Williams told team officials about using the substance in a pre-Olympics training camp. He did not disclose what the substance was.
The 22-year-old Williams had qualified for the 100 and 200 meters.
Williams marched at the Olympic opening ceremony on Friday.