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Sources: McNamee gave samples to rule himself out as tissue source

Updated: November 25, 2008, 1:14 PM ET
By T.J. Quinn | ESPN.com

Brian McNamee, the personal trainer who accused Roger Clemens of using steroids and human growth hormone last year, gave a DNA sample to FBI agents in August to bolster his accusation, two sources told ESPN.

Investigators hope to establish whether syringes provided by McNamee in February contain Clemens' DNA and were used to inject him with performance-enhancing drugs. Clemens has been under investigation for perjury since he testified to Congress in January that he had never used steroids ...

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