US Anti-Doping Agency tightens security after threats

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PARIS — The head of the U.S. Anti-Doping Agency tightened security at his organization after receiving several death threats during his investigation of Lance Armstrong.

In August, Armstrong dropped any further challenges to USADA’s allegations that he took performance-enhancing drugs to win the Tour de France from 1999-2005. A day later, USADA stripped Armstrong of his Tour titles and banned him for life. Armstrong, who has denied doping and points to hundreds of tests he passed, has claimed Tygart has a vendetta against him.

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