Metadata is JUST number + duration. Not localtion, cell phone tower...
targetting cannot be done on citizens or permanent citizens, or people in the US. Permanent citizen in Madrid is safe.
No "reverse" targetting(targetting foreigner but really interested in US nat'l)
if citizen/perm. res accidentally targeted, info not used, FISA court signalled, house intel + judiciary signalled.
If targeted person is initially out of US, but venture in, targeting stops IMMEDIATELY.
Info accidentally gotten (for example, lag when stopping of the targetting mentioned previously), ineligible info is purged. All ineligible info is purged.
All targeting is reviewed beforehand , both by DNI and judiciary. All targets are audited
Plus this was used on less than 300 numbers. 20 people in the world have access to the info. The justification procedures are stringent.This hearing restored some confidence in checks and balances. And a good point by Deputy AG Cole: This is for foreign surveillance ONLY. There used to be no oversight for foreign surveillance. Now there is through FISA Court and this second court order with all these rules in it.
Also, NSA can't listen to the calls without fixed warrant, and the brothers were in the US at the time of planning their thing, so out of NSA jurisdiction anyways.