Last month, a company called AOptix unveiled its latest creation, pitched as a game-changer in the world of iris recognition. In less grandiose terms, it's basically an iPhone case for cops, providing military-grade biometric scanning on the move. The AOptix shell is built to provide everything an officer needs to process a suspect on the spot. There's a fingerprint scanner on the back, the capacity for facial recognition, and the new guest at the party: an iris scanner. The camera's a little tricky — you have to hold it a little less than a foot away, and keep it steady for a few seconds — but otherwise, using the Stratus is like taking pictures with a heavier, clunkier iPhone. Crucially, it's small enough to hold with just one hand, so the officer using it can still reach for his gun.