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 said Williams had been using a substance, which was clearly outside the medical code.
Knight said Williams had not tested positive, but the team acted after consulting with the World Anti-Doping Agency to find out about the product.
Williams told team officials about using the substance which the team has not disclosed in a pre-Olympics training camp.
The 22-year-old Williams had qualified for the 100 and 200 metres, and gave samples for anti-doping tests at national Olympic trials last month.