Pedzisa mutsara unotevera: Muna September 2011, Horakova akanga aedzwa kuti ane utachiona hweclenbuterol paakanga achitora chikamu mumakwikwi eFourcross mountain biking kuWorld Championships. Pana 28 June 2012 Union Cycliste Internationale yakanga yasarudza zviri pamutemo kurayira Horakova makore maviri kumiswa kubva
UCI World Championships, uye zvinotokosha zvikuru, kubva kuMitambo yeOlympic muLondon, pasinei nokukwikwidzwa neCzech Cycling Union pakuvamba gore iroro.