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Lance Armstrong: Enough is enough
Lance Armstrong says he will no longer fight charges from the U.S. Anti-Doping Agency that he used performance-enhancing drugs during his cycling career.

For more on the story, click here.
To see a clip of the 60 Minutes interview from last May in which Armstrong's former teammate, Tyler Hamilton, tells Scott Pelley that he witnessed Armstrong use performance-enhancing drugs, and participated in the doping himself, watch the below video.
To read Lance Armstrong's statement on why he came to his decision, click here.
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