"If there are specific products he is worried about, we can engage with quick research," Howman said in a telephone interview.

“如果人们有他所担心的特定产品，我们可以进行快速研究，”豪曼在接受电话采访时说。

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"It may have nothing to do with trainers and electrolytes, " Howman told BBC Radio Five Live.

BBC: SPORT | Tennis | Tennis drug tests questioned

Howman says the list of banned substances runs to 10-15 pages, with hundreds of drugs currently prohibited.

CNN: Hi-tech tests to catch Olympics drug cheats at London 2012

"He's got to follow a certain course, " David Howman, director general of World Anti-Doping Agency, told the AP.

NPR: Lance Armstrong May Not Be Done Confessing