Todd Zywicki at The Volokh Conspiracy looks at the evidence trail in the Bonds perjury case and decides Greg Anderson really is the key to an indictment:

In short, Bonds let Anderson handle everything, from protocol, to purchase, to shots, and to workouts. Clearly Bonds asked no questions about what Anderson was doing and simply trusted him to handle everything. Equally clearly Bonds knew what Anderson was giving him, especially in light of the physical side effects of the drugs. So common sense seems to suggest that he perjured himself, but a close sifting of the evidence that we know about the evidence seems much less clear. But he seems to have created an almost perfect intermediary in Anderson who could protect him. Every chain of evidence in the case seems to end at Anderson. Although common sense then connects Anderson to Bonds, I can't recall any specific, provable fact that provides that final link.

So if Anderson does not roll over on Bonds, can the prosecutors prove beyond a reasonable doubt that Bonds perjured himself before the grand jury when he denied knowingly taking steroids? For those who have followed the case and/or read the book, remind me of any specific, provable facts that I have forgotten, especially about any specific eyewitness accounts of Bonds getting shots or any paper trail that specifically connects Bonds to performance enhancing drugs, rather than just Anderson. This may explain why the government has so far been unable to indict Bonds without Anderson's testimony, as well as why they are pushing on Anderson so hard to get him to testify. Wihtout Anderson's testimony, I have serious doubts about whether the feds will be able to get Bonds on perjury (although tax evasion should be easier).

It seems Bonds and Anderson set this up very well to protect Barry.