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Passenger Profiling

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Overview

The second-generation Computer Assisted Passenger Pre-Screening System (CAPPS-II) proposes to sort all airline passengers into different categories by assigning a risk assessment "score" to each passenger: green for minimal, yellow to spark heightened security procedures, and red for those judged to pose an acute danger, who would be referred to law enforcement for possible arrest. At the core of CAPPS is the idea to focus scrutiny on the "high-risk" passengers while simultaneously reducing the hassle factor for "low-risk" travelers.

The first generation CAPPS was introduced in 1996 as a stop-gap measure prior to the full screening of all bags for explosives. The second generation system that is currently in development purports to improve the screening of both dangerous things and people by relying on experimental data-mining algorithms to find patterns in the government and commercial databases available on individuals. In the future there is a risk that a CAPPS-II system might be deployed for the government to control access to all forms of transportation, including ships, trains, and buses, and might also encompass government buildings and public spaces.

CAPPS-II originally shared many of the same elements of the now defunct Defense Department's "Total Information Awareness" program, which aimed at profiling innocent people. While there is an important threshold question if any of these profiling programs will actually be effective, there is also a vital need to engage in a public debate over the appropriateness and the privacy and security risks of such systems. A crucial first step for the debate is greater transparency from the Transportation Security Administration (TSA). In January 2003, the TSA published a Federal Register notice announcing that the agency would create a new system of record called the "Aviation Security Screening Records" (ASSR) database. The notice described a system that would allow the government access to "financial and transactional data" as well as virtually unlimited amounts and kinds of data from other proprietary and public sources. The agency also indicated in that notice that many private and public entities might gain access to the personal information used in the passenger screening database. Yet the notice did not provide information about how passengers can challenge their "score" or otherwise seek redress for their treatment at airports if they think it is based on inaccurate information. The TSA issued a new Privacy Act notice (pdf) in July 2003 to take the comments it had received into account.

The TSA intended to test the profiling system with Delta Airlines in three mid-size airports in the Spring of 2003. However, Delta, after strong public opposition, decided not to provide its passengers' data. The TSA originally planned on rolling the system out nationwide by Summer 2004. They have thus far postponed that implementation until further notice, and testing until at least the end of 2004. Congress has begun to exercise their oversight power and the White House Office of Management and Budget is questioning the program's effectiveness. EPIC is actively engaged in open government law litigation to assist public oversight of the program and will make documents available through this web site.

History

The first generation CAPPS (CAPPS-I) was developed in 1996 by Northwest Airlines as a temporary measure to assist in passenger bag screening. A string of airline bombings from the 1970s, including Air India and Pan Am, prompted European airports to install explosive detection systems (EDS) to screen all bags and to create a passenger bag-matching program so that a passenger and his or her bags traveled on the same flight. American airlines and airports, who had primary responsibility for aviation security unlike the Europeans, resisted the introduction of EDS and passenger bag-matching citing the high costs and severe disruption to domestic airline traffic. The deadly crash of TWA Flight 800 in 1996, however, prompted American airlines to re-examine their security policies. An Aviation Safety Commission was formed, headed by Vice President Gore, to investigate how the system could be improved.

The Gore Commission reviewed the need for screening all bags for explosives and whether a passenger bag-matching program should be instituted. The Commission also considered a proposal to selectively search people's baggage on the basis of their risk profile developed from a computer program. A civil liberties advisory panel was created to debate the implications of using such a profiling technology and how its impact on civil liberties could be measured and possibly mitigated. In 1998 the Gore Commission ultimately recommended the deployment of CAPPS-I as a temporary measure while airlines installed systems to screen all checked baggage. Passenger bag matching was instituted for all international flights, but was deemed too onerous and impractical for domestic flights. CAPPS-I would be used to find "selectees" on each flight whose checked baggage would be subjected to additional scrutiny. A certain percent of selectees would also be drawn at random.

The Federal Aviation Administration issued a Notice of Proposed Rule Making (see NPRM) on April 19, 1999 to implement CAPPS-I. The computer program at the heart of CAPPS-I is a rule-based system that is reported to assign scores to passengers on the basis of how much information is available on them. The information relied on for this score comes solely from information provided by the passenger to the airline, including payment information. The program resides on the airlines' computer reservation system. The system was supposed to be designed to not discriminate on the basis of constitutionally protected categories such as gender or race. The Justice Department reviewed the program and concluded that it the program's design did not violate civil rights. Nevertheless, the Justice Department was required to conduct periodic reviews of the system to ensure that in practice it did not have a discriminatory effect. There are no reports on how effective the first CAPPS program has been.

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Last Updated: August 5, 2008
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