NSA catches only 10% of data legally, but is it a fair trade off?

That leaves large-scale privacy invasion on 90% of 160,000 analysed messages swept up illegally by the NSA. But credit where credit is due: the legal 10% of intercepts have significant intelligence value, including data about a secret overseas nuclear project and double-dealing by an ostensible ally.

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Story added 8. July 2014, content source with full text you can find at link above.