https://www.pbs.org/wgbh/pages/frontline/government-election... Here's a fun little interview. They had a program that apparently worked, for much cheaper than Michael Hayden's program (I think Trailblazer). Got shelved apparently due to "not expensive enough". 9/11 happens and Binney contends his ThinThread program could have stopped it. You don't want more dragnet surveillance; even beyond the abuses, it leads to it being harder to catch things