Although NSA officials were not sure about what all documents Edward Snowden took with him, they've changed their tune a few times after some new leak proves their previous proclamations to be false...like when former NSA Chief Keith Alexander admitted to lying about phone surveillance stopping 54 terror plots. Despite a year of NSA officials claiming that Edward Snowden had access to reports about NSA surveillance, but no access to actual surveillance intercepts, that ends up being lie too.
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For a world already on edge about NSA spying, drone technology is just another reason to keep looking over our shoulders.