According to information in a Washington Post article on February 5, 2006: “of the approximately five thousand NSA [National Security Agency] warrantless taps conducted between September 2001 and December 2005, fewer than ten Americans a year drew enough suspicion to move to the next level. That involved obtaining a FISA [Foreign Intelligence Surveillance Act] order to begin targeting their domestic communications.”
– James Bamford, The Shadow Factory, Page 267