The BBC has seen indications that labs are classing positive tests for the blood-boosting drug EPO as negatives. Some samples have been described as suspicious - giving rise to fears that no action will be taken against cheats. One sport drug expert told the BBC that many of the finalists in Olympic endurance events would be using EPO. "Copycat" versions of the drug are available on the internet for as little as $50 - and according to experts are often undetectable.

Full story: news.bbc.co.uk