Greene is the former 100m world record holder
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Reigning Olympic 100m champion Maurice Greene has revealed he has been tested for drugs more than 20 times this year.
Greene's HSI training group has seen several of its athletes become involved in a doping scandal.
Greene, who runs at the Paris Golden League meeting on Friday, has passed all his tests.
"At least twice a month they have been coming to our house. The last one was at the Olympic trials," said the American sprinter.