Robert Nolan, former CIA agent and author of See No Evil, memoir of his time at CIA, gave an interview to the Foreign Policy Association. Here's an interesting exerpt:
FPA: ...Where should the U.S. be focusing its attention?RN: Saudi Arabia. Fifteen of those bombers came from Saudi Arabia. They were recruiting on Saudi mosques, by Egyptian clerics or Saudi clerics, and paid for by the government. There hasn't been a single arrest, and I have heard very reliably that the second and third tier police officers are not cooperating in the investigation. We have to bring along Saudi Arabia to do a full investigation of who was behind September 11. We haven't so far. I understand why we went into Afghanistan first. I understand why we went after Qaeda. It was a problem. But now we have to move to the real targets, which are the Gulf Arabs.
See, I keep telling you people I'm not smoking dope on this issue.
Important correction: It's come to my attention that the CIA agent is named Bob Baer. Robert Nolan was the author of the article in question, and I can only assume has no ties to the CIA. Many apologies for the careless and shameful mistake.