Loose Nukes In Iraq Not WMD?

Am I missing something here? If there is a threat that terrorists might use the material produced or discarded at these nuclear facilities, then why aren’t they classified as weapons of mass destruction or potential weapons of mass destruction?
This is a legitimate threat. We’re talking nuclear looting at these plants. For crying out loud he had a nuclear program going on! And yet this doesn’t seem to satisfy some of the ongoing demands that we find evidence of those WMDs? This is very curious.