I saw your advert in the paper https://casemanual.net/fertilcare-uk-42b6.pdf fertilcare uk
  NSA officials disclosed that the "selectors" used to pull in tranches of communications are names, telephone numbers or e-mail addresses -- and not keywords, like "bomb." They said that if a U.S. citizen's e-mail metadata happened to be transiting through the U.S. AND included a valid selector, it would be pulled from the Internet stream. At that point, NSA would not know whether the communication was from a US person or not. Step two: the NSA filters go to work. If the filter finds evidence from the metadata that the author of the e-mail is a US person, it instructs the NSA's computers to "minimize" the e-mail, making its source invisible to the analyst. The analyst would use a variety of means to see if the US person (whose identity has been anonymized) is on a watch list, or is already subject to FISA collection, or is communicating with a target, or otherwise meets a threshold that warrants further scrutiny. At that point, the NSA would seek a FISA order or turn the identity of the person over to the FBI.