LaShawn Merritt can defend his Olympic 400m title at London 2012 after winning an appeal against an International Olympic Committee doping law.
The IOC's rule had barred any athlete who has received a doping suspension of more than six months from competing in the next Games.
The American, 25, believed it went beyond World Anti-Doping Agency (Wada) sanctions of a maximum two-year ban.
The outcome could force British chiefs to re-think their regulations.
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