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BERLIN (Reuters) - Re-testing of hundreds of athletes' samples collected at the London 2012 and Beijing 2008 Games is underway as the International Olympic Committee (IOC) bids to root out cheats ahead of Rio 2016.
Doping has overshadowed the run-up to the Olympics with scandals involving the IAAF, the ruling body of athletics, track and field competitors plus several countries including Russia and Kenya who could be excluded from the Games.
"The aim of the (re-testing) program is to prevent athletes who cheated in London or Beijing, and got away with it because we didn't have as advanced methods of analysis as we do now, from competing in Rio de Janeiro," IOC medical director Richard Budgett told an anti-doping symposium in Lausanne on Tuesday.
"The results will come in a number of weeks or months."
Athletics, the showpiece sport of the Olympics, was rocked last year when Russia was suspended from the sport after a World Anti-Doping Agency (WADA) investigation uncovered a state-sponsored doping program.
Kenya could also be banned if it does not deliver on promises to WADA.
Tennis was dragged through the mud last week when former world number one Maria Sharapova announced she had tested positive for the banned substance meldonium.
"We are trying passionately to protect those clean athletes who are going to Rio 2016," Budgett said. "The best way to do that is to catch the cheats and deter the cheats before we get to Rio de Janeiro."
The IOC said it welcomed a new WADA task force that would gather information and intelligence and identify athletes who should be included in registered testing pools, and those that should be tested during the four-week period of Rio 2016.
Olympic samples are frozen by the IOC for eight years and re-tested using new methods. It also looks for substances that were not known at the time of competition.
Beijing samples were re-tested a few months after the 2008 Games, yielding five positive tests including Bahrain's 1500 meters champion Rashid Ramzi.
Five athletes were also caught after a similar process was undertaken following the 2004 Athens Olympics.
The first Games in South America will be held from Aug. 5-21.
Reporting by Karolos Grohmann; Editing by Tony Jimenez