The Hemisphere Project: The DEA Has Been Recording Phone Call Details Since 1987; 4 Billion Calls Now Recorded a Day.

A slide presentation given to The New York Times shows that the Hemisphere Project was started in 2007 and has been carried out in great secrecy.
http://s3.documentcloud.org/documents/782287/database.pdf
SEE ALSO: http://reason.com/blog/2013/09/02/report-dea-has-been-secretly-snooping-on