A positive backup sample has confirmed the presence of a banned substance in Luxembourgish rider Frank Schleck at the Tour de France. Schleck was pulled from the Tour last Tuesday after a positive test for the diuretic Xipamide on July 14. “The result of the counter test was positive but for me nothing changes: I just know that I did nothing wrong,” Schleck said in a statement. “I will therefore continue my search to find out how the substance could have entered my body.” Schleck previously suggested he may have been poisoned. Xipamide is typically used to mask banned performance enhancers, or as a supplement for weight loss. Classified as a "specified substance" by the World Anti-Doping Agency Code, the presence of Xipamide in an athlete's test does not require a provisional suspension.