The number of "terrorists" -- or at least persons of interest -- could be much, much smaller. The NSA would ask for most of the people the person of interest ha

The number of "terrorists" -- or at least persons of interest -- could be much, much smaller. The NSA would ask for most of the people the person of interest had ever emailed or phoned, and everyone they ever emailed or phoned. I don't feel up to doing the math, but clearly a quite small number of actual suspects could easily explode to 47K.