The entrance of Godolphin stables is seen in Newmarket, eastern England April 23, 2013. A trainer for Sheikh Mohammed bin Rashid Al Maktoum's horses has admitted to a "catastrophic error" in using banned steroids to dope horses at the Dubai ruler's Godolphin racing stable. Eleven horses tested positive for steroids, including stanozolol - the performance-enhancing drug used by disgraced Olympic sprinter Ben Johnson at the 1988 Seoul Olympics. REUTERS/Stefan Wermuth (BRITAIN - Tags: SPORT HORSE RACING)