A fight is on to preserve evidence of possible drug-taking by international footballers after a Spanish judge ordered blood bags that could expose some of the sport's famous names to be destroyed.
The blood samples were evidence in the trial of Dr Eufemiano Fuentes, who received a suspended one year jail term for his blood doping services to cyclists.
Since a raid on Dr Fuentes' clinic seven years ago, more than 200 coded blood bags and supporting documentation relating to stars from a variety of sports were kept by police.
Today's ruling may mean the identities of those who used the doctor's services will never be found revealed.
UK Anti-Doping chief executive Andy Parkinson said the body was "disappointed" in the judge's decision.
"Dr Fuentes has admitted to having been involved in multiple prohibited doping activities, and linked with multiple unnamed athletes", Mr Parkinson said.
"It therefore cannot be right that these names will remain unknown and that no immediate action can be taken by the anti-doping community to protect our clean athletes".
Tennis star Andy Murray also blasted the ruling, calling it "beyond a joke" and the "biggest cover-up in sports history":
operacion puerto case is beyond a joke... biggest cover up in sports history? why would court order blood bags to be destroyed? #coverup