The technology also allows authorities to mine call databases and cross-reference the voices of individuals prisoners have spoken with.
Despite the volume of revelations, much of the public remains largely unaware of the true extent of the NSA's vast, highly aggressive and legally questionable surveillance activities. Given the vast amount of revelations about NSA abuses, it is somewhat surprising that just slightly more than a majority of Americans seem concerned about government surveillance. Which leads to the question of why?
500 signatories include five Nobel prize winners, Writers demand 'digital bill of rights' to curb abuses
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