NY Post finds proof of error of "wall of separation"
The Post ran found memos pointing out that members of the intelligence community pointed out that we had to remove Jamie Gorelick's wall to effectively combat terrorism at home. Couple this with the very specific cases sited and their outcome and I think you can safely conclude that was failed policy that at least attributed to the 9/11 disaster. Powerline
has the reference, the salient paragraphs and interesting comments.