Law professor Peter Keane on Judge Illston's ruling that players linked to BALCO will have their testimony allowed.

"I think that hurts Bonds a lot, and I think it’s something the jury is going to find fairly important in determining that Bonds used steroids and other drugs," Keane said. "It targets in on Bonds in a way that shows the jury that he was using drugs and he knew he was using them. It’s another brick in the wall of the prosecution’s case."