Here's the situation.
First; need to calm down, read the article CAREFULLY, and go back and have a historical understanding of the 1991 terms of the war ending and the various UN resolutions.
The article isn't talking about WMDs at all.
It's talking about various industrial facilities, machines, etc. that could theoretically be used to MAKE WMDs, or make things that could then be used to make WMDs.
Iraq was prohibited from posessing WMDs. There were some things that are basically only used for making WMDs that it was prevented from having.
But there was a lot of equipment and industrial sites they were legally permitted to have as long as they had been regularly inspected by the UN; on the premise that the goal wasn't to shut down the Iraqi economy; it's impossible to have even a semi-functioning modern industrial base of a normal medium sized country like Iraq without having facilities that, while they can produce non-WMDs, could also be used to make WMD materials.
What the article is stating is that SINCE the war and US control of Iraq many of these items and facilities have been looted and scattered around.
I remember the missile incident. The Iraqi engineers said they were withing the terms of the treaty. I believe it was the launching vehicle that gave it away. They were all to be destroyed but I suppose that paperwork takes a few years of kickbacks.