LONDON - IOC presidential candidate and pole vault great Sergei Bubka says the spate of recent high-profile doping cases in track and field shows global drug-testing efforts are working and cheaters "will pay the price."

The former Olympic gold medalist and six-time world champion says he was disappointed by the positive tests involving sprinters Tyson Gay, Asafa Powell and Sherone Simpson but takes heart that the anti-doping system "works."

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Bubka says "of course some positive cases are unpleasant" but "you will pay the price if you go the wrong way."

The Ukrainian, who is also a vice president of the IAAF, says athletes should know by now that they should avoid taking supplements because they might contain banned substances.