Thanks Bigtree! One more thing
Hints of the surveillance appeared in a
set of rules, leaked by Mr. Snowden, for how the N.S.A. may carry out the 2008 FISA law. One paragraph mentions that the agency seeks to acquire communications about the target that are not to or from the target. The pages were posted online by the newspaper The Guardian on June 20, but the telltale paragraph, the only rule marked Top Secret amid 18 pages of restrictions, went largely overlooked amid other disclosures.
...
Timothy Edgar, a former intelligence official in the Bush and Obama administrations, said that the rule concerning collection about a person targeted for surveillance rather than directed at that person had provoked significant internal discussion.
There is an ambiguity in the law about what it means to target someone, Mr. Edgar, now a visiting professor at Brown, said. You can never intentionally target someone inside the United States. Those are the words we were looking at. We were most concerned about making sure the procedures only target communications that have one party outside the United States.
The rule they ended up writing, which was secretly approved by the Foreign Intelligence Surveillance Court, says that the N.S.A. must ensure that one of the participants in any conversation that is acquired when it is searching for conversations about a targeted foreigner must be outside the United States, so that the surveillance is
technically directed at the foreign end.
http://www.nytimes.com/2013/08/08/us/broader-sifting-of-data-abroad-is-seen-by-nsa.html?hp&_r=0&pagewanted=all