Okay, NSA, so how about some transparency to clear up these supposed "inaccuracies"? Nobody believes you if you just deny something without providing evidence to back it up.
The only way the NSA/FBI/Obama administration are actually going to give up any hard evidence is if compelled to.
The EFF is certainly attempting to do just that: https://www.eff.org/deeplinks/2013/06/confirmed-nsa-spying-m...