Russian Sergei Kirdyapkin won the 50km walk at the 2012 London Olympics
Mehdi Baala
Selective periods of bans means Rob Heffernan will have to wait for medal upgrade
Mahiedine Mekhissi-Benabbad disqualified after removing vest on home straight of steeplechase
French man pulls off running vest while clearing final hurdle in 3,000 metres steeplechase
French man pulled off running vest before clearing final hurdle in 3,000 metres steeplechase
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