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"NSA Data Collection has no impact on terrorism" : http://www.bloomberg.com/news/articles/2014-01-13/nsa-data-has-no-discernible-impact-on-terrorism-report http

• josefresco 12y ago
  The scope was very limited: "Our investigation found that bulk collection of American phone metadata" Also, using "arrests" or case arrests as the sole evidence or set of data is also quite limited. I would imagine, foiled plots don't always result in an arrest. Details matter, and by the time reports like this hit the media, they get boiled down in to attention grabbing headlines divorced from the original conclusions.