Trainer Mahmood Al Zarooni arrives for a Disciplinary Panel Hearing at the British Horse Racing Authority in London April 25, 2013. Trainer Mahmood Al Zarooni, who last year won the world's richest horse race - the Dubai World Cup - could lose his licence after admitting using banned steroids to dope thoroughbred horses in Britain. REUTERS/Luke MacGregor (BRITAIN - Tags: CRIME LAW SPORT EQUESTRIANISM HORSE RACING)