Revealed: the top secret rules that allow NSA to use US data without a warrant

[Jarla]

57. So what are the "limitations on NSA's ability to filter communications"?

From the Document on Minimization Procedures

Section 3(b)(1)
Personnel will exercise reasonable judgment in determining whether information acquired must be minimized and will destroy inadvertently acquired communications of or concerning a United States person at the earliest practicable point in the processing cycle at whi ch such communications can be identified either: as clearly not relevant to the authorized purpose of the acquisition the communication does not contain foreign intelligence information); or, as not containing evidence of a crime which may be disseminated under these procedures. Such inadvertently acquired communications of or concerning a United States person may be retained no longer than five years in any event. The communications that may be retained include electronic communications acquired because of limitations on NSA's ability to filter communications.


I'm curious about how many electronic communications from United States persons are being acquired "inadvertently" because of these "limitations."