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In theory. In practice, they spy on you for a week, and then obtain a warrant because they have "probable cause", taken from all the spying.

Is that how it happens in practice? Interesting. Where can I read more about how data from FISA warrants are used to build probable cause for domestic criminal cases?

I read the Kravets piece at your recommendation only to find that there was no mention in it of anyone using data obtained through FISA to build domestic criminal cases of any sort.

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