Declassified Report Shows Doubts About Value of N.S.A.’s Warrantless Spying

The document is a lengthy report on a once secret N.S.A. program code-named Stellarwind. The report was a joint project in 2009 by inspectors general for five intelligence and law enforcement agencies, and it was withheld from the public at the time, although a short, unclassified version was made public. The government released a redacted version of the full report to The New York Times on Friday evening in response to a Freedom of Information Act lawsuit.