Iraq had chemical weapons in the past. The big question is do they still have them?
Empty warheads had been found, suggesting that they either moved the chemicals, or disarmed them. I keep hearing about they found WOMD, until to find out later that they found traces of chemicals in empty warheads.
Some chemicals are easy to get, like mustard gas, just get some mustard seeds, nasty stuff. Used in World War I, very deadly. Same stuff you can put on a hotdog or hamburger, only more condensed mustard.