An Iraqi military defector identified as unreliable by the Defense Intelligence Agency provided some of the information that went into United States intelligence estimates that Iraq had stockpiles of biological weapons at the time of the American invasion last March, senior government officials said Friday.

[...]

Intelligence officers from the D.I.A. interviewed the defector twice in early 2002 and circulated reports based on those debriefings. They concluded he had no firsthand information and might have been coached by the Iraqi National Congress, the officials said. That group, headed by Ahmad Chalabi, who had close ties to the Pentagon and Vice President Dick Cheney, had introduced the defector to American intelligence, the officials said.
[link|http://www.nytimes.com/2004/02/07/politics/07INTE.html| NY Times ]