Ban on clenbuterol doping drug may be relaxed
The World Anti-Doping Agency (Wada) will discuss controversial changes to drug rules at a meeting this weekend.
In Switzerland, Wada officials will consider relaxing the absolute ban on the drug clenbuterol, used illegally by athletes to build muscle.
Some athletes say their positive test results for the drug were caused by eating beef.
London's Olympic anti-doping chief says a minimum threshold would make testing more uniform.
Clenbuterol is a powerful drug used to treat asthma, but it can also help build up lean muscle mass and burn off fat.
The drug's growth-promoting ability has also found favour with beef farmers, particularly in China and Mexico.
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