The French Ambassador to the U.S. says that if Iraq goes chemical/biological, then that "would a create a completely new situation for the whole world." Saddam has already used chemical/biological weapons in military action [see the interactive sidebar: "Chemical and biological weapons Iraq says it has manufactured in the past"]. To summarize, he used mustard gas in the Iran war, he used Tabun, a nerve agent, during the Iran war, he used Sarin, a nerve agent, during the Iran war, he used Cyclosarin, a nerve agent, during the Iran war, and he used CS, a tear gas, during the Iran war. What's changed?