IIRC, a lot of the evidence in the Saddam case came from a defector from Iraq that spun a story to tell the Americans what they wanted to hear. No one bothered to do enough verification of what they were hearing because it was what they wanted to hear.
This doesn't change anything I said, though. Regardless of where it comes from, "hidden facts" from agencies with an agenda that don't necessarily align with citizens are not to be automatically trusted.