Another long day in the trial of Roger Clemens had a bit of a twist when former strength coach Brian McNamee admitted Thursday to changing his story regarding some evidence.

McNamee kept a used needle and some waste in a beer can, which may contain Clemens' DNA and link him to performance-enhancing drugs. McNamee previously told Congress in 2008 that he kept the evidence because he was starting to distrust Clemens. But earlier this week, he told the jury his wife had advised him to keep it in order to protect himself.

McNamee said his story changed because he wanted to keep his wife out of the issue. But with the pair going through a divorce, McNamee had a change of heart, apparently.

Clemens' lawyer, Rusty Hardin, jumped at the opportunity to portray McNamee as a serial liar, as the trainer began to forget specific dates and dosages.

But the trial is now in its fifth week and the slow pace is starting to take its toll on all involved. Two jurors have already been dismissed for falling asleep.

"At this pace, I guess we'll be here forever," said U.S. District Judge Reggie Walton, according to the AP.

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