Doping cloud casts long shadow over world athletics championships

As athletics gears up for the world championships in Beijing, a sport torpedoed by explosive allegations of widespread doping will be desperately hoping to avoid further scandal. The allegations by the Sunday Times and German broadcaster ARD triggered lurid headlines likening athletics to cycling, whose dark history of doping scandals culminated in disgraced American Lance Armstrong being stripped of his seven Tour de France titles. "There is a zero tolerance to abuse of doping in my sport," sai