Timothy Edgar, a privacy official in the Office of the Director of National Intelligence in both the George W. Bush and Obama administrations who now teaches at Brown University, said the explanation filled an important gap in the still-emerging history of post-Sept. 11, 2001, surveillance.
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“The document makes it clear that N.S.A. is able to get all the Internet metadata it needs through foreign collection,” he said. “The change it made to its procedures in 2010 allowed it to exploit metadata involving Americans. Once that change was made, it was no longer worth the effort to collect Internet metadata inside the United States, in part because doing so requires N.S.A. to deal with” restrictions by the intelligence court.Observers have previously suggested that the N.S.A.’s November 2010 rules change on the use of Americans’ data gathered abroad might be connected to the December 2011 end of the bulk email records program. Marcy Wheeler of the national security blog Emptywheel, for example, has argued that this was probably what happened.