Britain's anti-doping agency is stepping up intelligence operations to weed out drug cheats ahead of the 2012 London Olympics.
Former police officers have been employed by UK Anti-Doping to investigate networks and individuals providing banned substances to athletes.
"As our people get more technically proficient, more sophisticated, then actually you will start to see cases coming out that have been on the basis of intelligence rather than the old-fashioned way of just tests," said UKAD chairman David Kenworthy.
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