The International Olympic Committee (IOC) rule bans any athlete suspended for six months or more from competing in the next Olympics to be held in London.
But it has had an unintended negative impact in several areas, US Anti-Doping Agency chief executive Travis Tygart said.
"The rule goes beyond the WADA (World Anti-Doping Agency) code and unintentionally has had the effect of deterring those who would otherwise provide substantial assistance to anti-doping authorities," Tygart said in an email.
(Published 13 January 2011, 16:05 IST)
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