My bet is there is a smoking gun tying Sadaam to Al Qaeda and the 9-11 attacks. The source is way too sensitive to reveal to the sheeple. Casual observation makes N Korea the biggest threat in terms of WMD. They just haven't attacked as Iraq probably has.
If the U.S. is not careful, they run the risk of losing their informants, that usually end up dead, and making it more difficult to gather information on the enemy if the enemy learns how we gather (methods) secrets