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Olympic athletes face blood tests
The IOC has been coming under increasing pressure to bring in the change because of problems with the current testing system. The new blood tests will make it easier to detect whether athletes have used the banned substance EPO. The BBC's Harry Peart reports.

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IOC executive board member Jacques Rogge: "EPO is a very difficult drug to test for"
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The BBC's Paul Newman: "We are expecting 400 of the 10,000 competitors to be asked for a blood sample"