An excerpt from a forthcoming book, All the Ways We Kill and Die, by Brian Castner tells the story of the hunt for the bomb-makers of Iraq and Afghanistan:http://motherboard.vice.com/read/the...metrics-at-war

It ends with a telling point:
Because that’s the funny thing about using biometrics. The only way to find one person is to find everyone.
From the author's website:
This is the story of an American family at war, and the men and women who fight this new technology-heavy and intelligence-based conflict. I interviewed intel analysts, biometrics engineers, drone pilots, special operations aircrew, amputees who lost their legs, and the contractors hired to finish the job. They are all hunting a man known as al-Muhandis, The Engineer, the brains behind the devices that have killed so many soldiers in Iraq and Afghanistan.