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Starting in 2015, the International Association of Athletics Foundations, which governs track and field, will dole out four-year bans to any athletes caught doping. [Daily Mail].

Sprinters Sherone Simpson and Asafa Powell are two of five Jamaican athletes who have tested positive for a banned substance today ahead of next month's World Championships. Earlier, we learned that American Tyson Gay had also tested positive for a banned substance. [Sky Sports]

American sprinter Tyson Gay has pulled out of next month's World Championships after testing positive for a banned substance. [BBC Sport]