I mean where abouts do you obtain WMD from? Creating WMD is not an easy process and it doesn't grow on trees.
Then once they have gone and created it, how do they get it into Iraq without being noticed? Do you think they can carry it on a plane flying into Baghdad or do they bring it across one of the borders like Kuwait or Turkey.
Once it's planted, how do you make sure it is not traceable seeing as only a few countries would be capable of producing it.
The argument that it would be easy to plant WMD is laughable and can be easily dismissed when it is much, much easier for the perpetrators to lie about it with scary talk of AQ, underground bunkers and 45 minutes to launch threats.