Interesting video with Binney who says they would've stopped every terrorist attack, including 9/11 had they used a simple technique him and his team outlined which he referred to as a "two degree principle".

He said its a myth they need all the data to make the connections in order to catch terrorists.

http://video.foxbusiness.com/v/2475191994001/former-nsa-empl...

He starts talking about at the 2:57 mark.