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The terrorist believe that there is no way that they can be located out of 10 million phone records.

Very simply put, and what is not reported, is that of the 10 million phone records the established matrix filters out about 9 million phone records that do not meet the criteria. Of the remaining 1 million phone records another 900,000 records are eliminated as not meeting the second tier matrix filter. The final 100,000 records that meet some, but not all criteria of interest, are evaluated for a final matrix test, eliminating another 75,000 phone records. This leaves about 25,000 phone records to concentrate on. If you are in the 25,000 of the 10 million phone records being scanned, you may have a problem. But for the rest of us I think we are pretty safe from every hearing from the US Government about our phone calls.