Josh Marshall's talking points memo brings up Amir Saadi, Saddam Hussein's science adviser and one of the first to turn himself in: at the time of the article, Saadi had been held in solitary since April. Marshall cites a David Ignatius editorial of July 18, wich suggests that Saadi's detention ws due to the fact that his WMD evidence probably undercut the Bush administration's assertion that Saddam had developed unconventional weapons (the post isn't working too well today, so use the link in Josh's article).
Lo and behold, this morning's Washington Post drops this bombshell: Scientists Still Deny Iraqi Arms Programs,
U.S. Interrogations Net No Evidence

The sources said four senior scientists and more than a dozen at lower levels who worked for the Iraqi government have been interviewed by U.S. officials under the direction of the CIA. Some scientists have been arrested and held for months, others have made deals in return for information and at least one has agreed to be interviewed outside Iraq.

No matter the circumstances, all of the scientists interviewed have denied that Hussein had reconstituted his nuclear weapons program or developed and hidden chemical or biological weapons since United Nations inspectors left in 1998. Several key Iraqi officials questioned the significance of evidence cited by the Bush administration to suggest that Hussein was stepping up efforts to develop new weapons of mass destruction programs.