[Updated 15 Oct 2014] – A NYT Article on chemical weapons (archived HERE) in Iraq points out that all the weapons found were PRE-1991 invasion, meaning there were no “build up of WMD’s” that Bush used to invade.  But, also interestingly is the following excerpt, giving proof that we supplied the weapons:

“…Participants in the chemical weapons discoveries said the United States suppressed knowledge of finds for multiple reasons, including that the government bristled at further acknowledgment it had been wrong. “They needed something to say that after Sept. 11 Saddam used chemical rounds,” Mr. Lampier said. “And all of this was from the pre-1991 era.”

Others pointed to another embarrassment. In five of six incidents in which troops were wounded by chemical agents, the munitions appeared to have been designed in the United States, manufactured in Europe and filled in chemical agent production lines built in Iraq…