 After repeated positives over the summer , including tests from Leonardo Piepoli and Bernhard Kohl at the Tour de France , and Davide Rebellin and Stefan Schumacher from the 2008 Olympic Games , the UCI has sought to have samples taken during the Giro retested . In October 2009 , it was announced that six to seven riders from this Giro had presumptive positives , while further untestable doping involving ozone was also suspected . In total , 82 samples were retested , and the presumptive positives have been compared to values stored at an anti @-@ doping lab in Lausanne , Switzerland . The identities of those riders who tested positive have not yet been revealed . It is believed that Rebellin and Sella are among the riders to have presumptive positives . 
