Landis, who was stripped of the 2006 Tour de France title for doping and served a two-year ban, has claimed that seven-time Tour champion Lance Armstrong tested positive at the Tour de Suisse and officials covered it up.
Armstrong won the Swiss race in 2001.
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The UCI says "none of the tests revealed the presence of EPO in the samples taken from riders at the 2001 Tour of Switzerland. The UCI has all the documentation to prove this fact."
The UCI also says it "categorically rejects any suspicion in relation to the concealment of results from parties involved in this field."