Kammala wannan jumla: A watan Satumbar 2011, Horakova ya gwada tabbatacce ga haramtaccen abu clenbuterol yayin da yake shiga cikin keken dutse hudu a gasar zakarun duniya. A ranar 28 ga Yuni, 2012, kungiyar Union Cycliste Internationale ta yanke shawarar hukunta Horakova da dakatar da shekaru biyu daga kungiyar.
UCI World Championships, kuma mafi mahimmanci, daga wasannin Olympics a London, duk da cewa kungiyar Czech Cycling Union ta yi kira a farkon wannan shekarar.