With three additional prosecutors, more than 50 new interviews of witnesses, and hundreds of hours of meticulous preparation, the U.S. government on Monday began its second effort to persuade a jury in the nation's capital that Roger Clemens lied when he told a Congressional committee that he had never used performance-enhancing drugs.

It's been nine months since federal prosecutors took their first shot at Clemens, an effort that ended in a humiliating mistrial when they mistakenly showed the first jury a video of a committee hearing that U.S. District Judge Reggie Walton had barred. Like the first attempt before it ended abruptly, this trial is expected to take four to six weeks.

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