Olympic short track medalist Simon Cho of the United States has been suspended for 2 years.
Cho admitted he tampered with the skates of a Canadian rival during the 2011 World Team Championships.
Cho says he tampered with the skates at the direction of former short track national coach Jae Su Chun.
Chun denies any involvement.
Cho will not be eligible to compete in the 2014 Olympics.
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