>The presentation claims Prism was introduced to overcome what the NSA regarded as shortcomings of Fisa warrants in tracking suspected foreign terrorists. It noted that the US has a "home-field advantage" due to housing much of the internet's architecture. But the presentation claimed "Fisa constraints restricted our home-field advantage" because Fisa required individual warrants and confirmations that both the sender and receiver of a communication were outside the US.

>"Fisa was broken because it provided privacy protections to people who were not entitled to them," the presentation claimed. "It took a Fisa court order to collect on foreigners overseas who were communicating with other foreigners overseas simply because the government was collecting off a wire in the United States. There were too many email accounts to be practical to seek Fisas for all."

http://www.guardian.co.uk/world/2013/jun/06/us-tech-giants-n...