Before the war, John Barry of Newsweek produced an amazing scoop. He obtained a leaked copy of the interview between General Kamal, Saddam's son in law, and the UN weapons inspectors.
Kamal was actually in charge of Iraq's weapons of mass destruction (WMD) programme - his defection to the west in 1995 caused panic in Baghdad. Every single assertion about Iraq's WMD programme, every government dossier and major speech relies heavily on Kamal's evidence. However, Barry showed that while Kamal exposed Iraq's pre-1991 WMD programme - the chemical and biological weapons, the plans for nuclear bombs - he actually also said these programmes were destroyed after 1991, although some documents were retained.