Data from checkpoints to be kept for 15 years.

WASHINGTON - August 20, 2008 - The federal government has been using its system of border checkpoints to greatly expand a database on travelers entering the country by collecting information on all U.S. citizens crossing by land, compiling data that will be stored for 15 years and may be used in criminal and intelligence investigations.

Officials say the Border Crossing Information system, disclosed last month by the Department of Homeland Security in a Federal Register notice, is part of a broader effort to guard against terrorist threats. It also reflects the growing number of government systems containing personal information on Americans that can be shared for a broad range of law enforcement and intelligence purposes, some of which are exempt from some Privacy Act protections.

While international air passenger data has long been captured this way, Customs and Border Protection agents only this year began to log the arrivals of all U.S. citizens across land borders, through which about three-quarters of border entries occur.

The volume of people entering the country by land prevented compiling such a database until recently. But the advent of machine-readable identification documents, which the government mandates eventually for everyone crossing the border, has made gathering the information more feasible. By June 2009, all travelers crossing land borders will need to present a machine-readable document, such as a passport or a driver's license with a radio frequency identification chip.