America's Secret Spy Court Has Been Radically Expanding The Powers Of The NSA

The court overseeing National Security Agency surveillance has given the government power to amass vast collections of data on Americans by creating a secret body of law with almost no public scrutiny, current and former U.S. officials told Eric Lichtblau of The New York Times.
The most important of the FISA court rulings — which have involved spying on those possibly involved in nuclear proliferation, espionage, and cyberattacks — involves carving out an exception to the Fourth Amendment’s requirement of a warrant for searches and seizures in the fight against terrorism.

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