One cannot present proof that one does not possess something. It is like saying, prove to me that you don’t own a Buick. No matter what you say, you could still have one hidden somewhere. It is impossible to “prove” that something does not exist. Saddam said he no longer had weapons of mass destruction. US intelligence said that not only did he have the weapons but there was a significant threat that he would use those weapons. We went to war to find and destroy those weapons. Now we can’t find any real evidence that they indeed do exist. We have been looking for them for 5 months (since the end of the major war effort). The UN inspectors looked for them for 6 months prior to that. If the US intelligence was so sure (enough to send soldiers into harms way) then where are the weapons?