The NSA only kinda cares about US law when operating against US citizens inside US borders. Outside of this, the gloves are fully off and from what we've seen, pretty much everything goes. Billions of people outside of the US live in a much higher resolution panopticon than those living in it.
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There are ~195 sovereign nations on the planet. Billions of people don't live in a US-style panopticon.
The NSA only kinda cares about US law when operating against US citizens inside US borders. Outside of this, the gloves are fully off and from what we've seen, pretty much everything goes. Billions of people outside of the US live in a much higher resolution panopticon than those living in it.