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Ullrich, seen here in the wake of his 2006 suspension from the Tour de France, has said that not blood doping during his era would have been "like going to a gunfight armed only with a knife"

Evidence of illegal blood doping was detected.

Australian sporting darling Peter Bol has been cleared of blood doping six months after failing a drug test.

But when injected in its synthetic form, EPO is a form of blood doping which has been employed by athletes - most famously Lance Armstrong - to aid stamina and recovery.

Both Dr Ordway and Dr Robergs say Bol's case could undermine confidence in the global anti-doping system and say Wada should review of its current blood doping procedures.