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by cyphar 2257 days ago
The NSA figured this out in the 90s -- you filter based on metadata and then retrieve the corresponding data if necessary. Aside from the fact that this (in the NSA's view) allows them to sidestep the 4th amendment, it's usually much more effective than sifting through billions of records every day. That same system lives on today with XKeyScore (or whatever they've replaced it with in the past 7 years).