Comment by PeterisP

I'm sure the other branches of US government would be delighted if NSA would share with them - not the secret data, but their data processing tools.

I mean, it appears that NSA has the ability to separate the retrieved gmail data into citizens and non-citizens, so they can legally use the non-citizen part of data and throw the 'forbidden' US-citizen data away. Think of the wonders that we could do with such technology! We wouldn't need passports anymore, when arriving from another country, you just provide your gmail account, TSA systems check that you're a citizen and lets you right in with a smile...