Del Quentin Wilber reports on The Crime Scene blog:

Former teammates of Roger Clemens may not be allowed to testify in the way federal prosecutors hoped would bolster the credibility of their star witness in their case against the legendary pitcher, a federal judge said Tuesday.

Prosecutors hoped the teammates would be permitted to testify that they knew they were being injected with performance-enhancing drugs by Brian McNamee, a former trainer and Clemens’ chief accuser.

McNamee is expected to testify that he injected Clemens with steroids and Human Growth Hormone (HGH) numerous times between 1998 and 2001 and that the former star pitcher knew what he was getting. Clemens has said he thought he was being given vitamins.

McNamee’s credibility is expected to be a major battleground during the lengthy trial, which starts Wednesday with jury selection.

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