London Olympics to conduct 24-7 dope testing

Half of all athletes taking part in the London Olympic Games will be tested for drugs from today in what is being billed as the biggest anti-doping operation in the history of the games.

A team of 150 scientists will take more than 6,000 samples between now and the end of the Paralympic Games on September 9 in a bid to ensure the Games are not tainted by disqualifications and scandals like those which have happened in the past.