What's disturbing is that even though they know which data is from US citizens, they still won't discard it, and can even use it. I mean, maybe I can understand if they "incidentally" collect the data of some people - although doing that for tens of thousand of people a year is really pushing it since all sorts of people could be in that "incidental" collection, and US persons could actually be targeted this way, and then masked as being "incidental collection".

But even after they know they are Americans, they still keep it? That's just unacceptable. This other story puts things in an even scarier perspective, because of what they can do with that data if it gets trickled down to other agencies (parallel construction, etc:

https://www.aclu.org/meet-jack-or-what-government-could-do-a...