The U.S. government started keeping secret records of Americans' international telephone calls nearly a decade before the Sept. 11 terrorist attacks, harvesting billions of calls in a program that provided a blueprint for the far broader National Security Agency surveillance that followed.
For more than two decades, the Justice Department and the Drug Enforcement Administration amassed logs of virtually all telephone calls from the USA to as many as 116 countries linked to drug trafficking, current and former officials involved with the operation said. The targeted countries changed over time but included Canada, Mexico and most of Central and South America.
Federal investigators used the call records to track drug cartels' distribution networks in the USA, allowing agents to detect previously unknown trafficking rings and money handlers. They also used the records to help rule out foreign ties to the bombing in 1995 of a federal building in Oklahoma City and to identify U.S. suspects in a wide range of other investigations.
The Justice Department revealed in January that the DEA had collected data about calls to "designated foreign countries." But the history and vast scale of that operation have not been disclosed until now.