AT and T's 1.9 Trillion Call Database
This whole article is worth reading, but I found this tidbit particularly interesting:
He was alluding to databases maintained at an AT&T data center in Kansas, which now contain electronic records of 1.92 trillion telephone calls, going back decades. The Electronic Frontier Foundation, a digital-rights advocacy group, has asserted in a lawsuit that the AT&T Daytona system, a giant storehouse of calling records and Internet message routing information, was the foundation of the N.S.A.'s effort to mine telephone records without a warrant.
An AT&\1T spokeswoman said the company would not comment on the claim, or generally on matters of national security or customer privacy.
But the mining of the databases in other law enforcement investigations is well established, with documented results. One application of the database technology, called Security Call Analysis and Monitoring Platform, or Scamp, offers access to about nine weeks of calling information. It currently handles about 70,000 queries a month from fraud and law enforcement investigators, according to AT&T documents. Schneier on Security: AT&T's 1.9-Trillion-Call Database
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