WASHINGTON — Brian McNamee claims he went from reluctant turncoat to angry accuser against Roger Clemens. He testified Tuesday that happened when Clemens' lawyers allowed details of McNamee's oldest son's illness to be revealed during a nationally televised news conference.

McNamee said he was furious. He said he went to his house and retrieved the medical waste he had collected from injecting Clemens with performance-enhancing drugs. McNamee turned the materials over to his lawyers, who gave it to law enforcement officials. It's now the physical evidence prosecutors are using to try to prove Clemens, the former pitching great, lied to Congress in 2008 when he denied using steroids and human growth hormone.

The prosecution is expected to show the evidence contains Clemens' DNA. The Clemens camp says the materials are tainted.

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