Well, well, well.
Looks like that WMD stockpile wasn't 100% verifiably destroyed, was it? Hans Blix says it's not important:
Former U.N. weapons inspector Hans Blix, speaking to the Associated Press in Sweden, said the shell was likely a stray weapon scavenged from a dump and did not signify that Iraq had large stockpiles of such weapons.
Sorry, Hans, but Saddam's government wasn't supposed to have ANY chemical weapons. First, Mr. Blix verified they had weapons, then he said no, there weren't any weapons. Now a weapon shows up. Hmm. At what point were you lying about the stockpiles, and why weren't the weapons destroyed immediately?
Thankfully the casualties were minimized due to the stupidity of the bomb-makers.