A top anti-doping official and doctors from the hospital where sprinters Costas Kenteris and Katerina Thanou were kept for five days, after their mysterious motorcycle accident during the Olympics, gave evidence before prosecutors investigating the case yesterday. Sources said David Howman, director general of the World Anti Doping Agency (WADA), testified before prosecutors Spyros Mouzakitis and Athina Theodoropoulou, informing them about procedures the agency employs when it conducts drugs tests. Prosecutors are investigating why Kenteris and Thanou missed a drugs test the day before the Games began. The two athletes claim they fell off a motorbike while speeding to the Olympic Village to take the test. The doctors from Athens’s KAT hospital whose signatures appeared on official medical declarations on August 15 and 16 about the health of the two sprinters also gave depositions. Sources suggest the doctors may be charged with delivering false medical opinions. The hospital manager, who also signed the documents, has been called to testify as well.