NSA Whistleblower Speaks Out on Verizon, PRISM, and the Utah Data Center (Sitaatti: "The Narus devices that the NSA put in different rooms around the AT&T fiber-optic network, or Verizon’s network, couldn’t collect everything. They could get most of it, but they couldn’t get it all. So in order to get all the data, they had to go to the service providers to fill in the blanks. That’s what the PRISM program is for—to fill in the blanks. It also gives the FBI basis for introducing evidence into court.") Libertas Institute. Viitattu 11.6.2013.