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              Congressional_______
              Research Service






Legal Challenges to the Terrorist

Screening Database



July  20, 2023

On September 11, 2001, agents of the al Qaeda terrorist organization hijacked commercial airplanes and
attacked the World Trade Center in New York City and the national headquarters of the Department of
Defense in Arlington, Virginia.... Nearly 3,000 civilians were killed, the Supreme Court observed.
In its report on the terrorist attacks and recommendations for how to prevent future attacks, the National
Commission  on Terrorist Attacks Upon the United States (9/11 Commission) found that relevant
executive agencies failed to effectively and efficiently share relevant counterterrorism information,
including information on individuals known to be or reasonably suspected of being involved in terrorist
activities. The 9/11 Commission advised that the prevention of future attacks would be furthered by
pooling and disseminating such information across agencies, both in the high-level operational planning
phase and during the points at which government agents may interact with individuals in the field-for
example, at the border, in an airport, or during a traffic stop. Since the 9/11 attacks, the Terrorist
Screening Database (TSDB), a sensitive but unclassified database consisting of biographical or biometric
information on known or suspected terrorists, has become a significant tool for information sharing in this
regard. While the federal government has sought to deploy the TSDB in a manner that protects privacy
and civil liberties, a number of individuals have raised legal challenges to the TSDB on various
constitutional and statutory grounds.
This Sidebar summarizes the development of the TSDB (which the government has referred to by other
names over time, and for simplicity will be discussed here as the TSDB), the legal authority for the
government's creation and use of the TSDB, the variety of legal challenges to the TSDB, and how federal
courts have adjudicated these claims. The Sidebar concludes with considerations for Congress.

Overview of the Terrorist Screening Database

A  Failure in Information   Sharing
The 9/11 Commission investigated the terrorist attacks of September 11, 2001, and sought to identify
ways to prevent future attacks from occurring. Among other things, the 9/11 Commission determined that
agencies shared counterterrorism information on a limited basis, thus hampering strategic analysis and
operational planning. The 9/11 Commission also found that the U.S. government did not find a way of
                                                                Congressional Research Service
                                                                  https://crsreports.congress.gov
                                                                                     LSB11009

CRS Legal Sidebar
Prepared for Members and
Committees of Congress

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