Professor Robert Weisberg is quoted in a New York Times story about Barry Bonds' attorneys' defense strategy:

Robert Weisberg, a Stanford Law School professor and director of the Stanford Criminal Justice Center, said both sides were engaged in “an incredibly careful verbal ballet.” The issue, he said, will be Bonds’s state of mind.

His defense could be that “he didn’t know he was taking a banned substance, therefore statements he made, though false, are honestly false,” said Weisberg, who added that such a defense was hard to prove. “His better hope” he said, was for his lawyers to challenge the prosecutors’ questioning of Bonds as too ambiguous or vague for his answers to have been false.