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What was the main reason for Sun Yang's ban according to CAS?

  • Tampering with doping control

  • Positive test

  • Missed test

  • Unauthorized medication

Answer

Sun Yang's primary reason for being banned by CAS was tampering with doping control. Specifically, he was found to have obstructed the sample collection process by smashing a blood vial with a hammer in front of doping control officers. This action was deemed to be a violation of anti-doping regulations and resulted in an eight-year ban from competition.
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