Arguing over the significance of the declaration's contents has already begun. One point of dispute is Iraq's obligation to prove that it has destroyed chemical and biological weapons material produced during the 1980s and 1990s. Iraqi officials say that they have no new information in this area, while both the US and UN insist that if the weapons were destroyed as Baghdad claims, documents must exist that support this assertion. 'The production of mustard gas is not like marmalade,' said head of the weapons inspections team Hans Blix on a visit to Baghdad in November. 'You have to keep some records.' Another contentious point is whether or not a false or incomplete declaration is sufficient to constitute a 'material breach' of UN Resolution 1441 and to trigger military action. Some in the Bush administration have espoused this position, but other Security Council members disagree, saying that the 'serious consequences' threatened by the resolution demand both a false declaration and non-compliance with inspectors on the ground.