EEVS Issue Brief

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Mandatory Electronic Employment Verifications Systems: Technological


The Department of Homeland Security (DHS) has been testing a system for employers to
electronically check an employee’s work eligibility. This system, recently renamed “E-verify”
attempts to match an employee’s personal information (such as name and Social Security
number) against databases at the Social Security Administration and DHS to verify whether he or
she is eligible to work. Congress has developed several different legislative proposals that would
greatly expand the system by mandating that employers verify all new hires and existing
employees. The Administration has also announced it will expand the system to cover all Federal
agencies regardless of Congressional action.

Reasons for Concern

Computing professionals have often witnessed large-scale federal information technology
projects start with good intentions but fail under the weight of design flaws and overambitious
goals. These experiences show that it is extraordinarily difficult to meet objectives and deliver
these projects on time and on budget. The state-of-practice for building such large systems and
satisfying security, reliability, survivability and guaranteed real-time performance is not
dependable. The proposed national verification system seeks to create a Federal IT system on a
scale and complexity never seen before, so there is a large possibility of major cost overruns and
significant shortcomings. Because the envisioned employment verification system would control
the access of all native and foreign-born citizens to employment in the United States, it would
have to be very carefully designed and tested if it is to be adequately secure, reliable, accurate
and respectful of privacy. ACM’s U.S. Public Policy Committee (USACM) sees issues related to
privacy and security, accuracy, scalability and access that must be addressed and resolved before
this massive new identity verification system could sensibly be adopted.

Privacy and Security

Privacy problems are becoming increasingly complex as ubiquitous dependence on computerized
databases increases. Information used in these systems includes all the primary personal
identifiers in the U.S., and thus leaks, theft, destruction or alteration of this data have severe
consequences, including identity theft and impersonation. Protections must be put in place that
follow established Fair Information Practices. It is important that policymakers understand that
the existing infrastructure is riddled with security and reliability vulnerabilities, and is not
sufficiently trustworthy. The total system cannot be adequately protected by purely technological
approaches, because many of the privacy problems arise from the large number of people who
will require, or who will improperly obtain, access to the system. This system will be no more
secure than the security of any point of access – even the dial-up connection from an outdated,
unprotected terminal. Carefully designed operational procedures will be essential to limit system
access to just the amount necessary for the intended purpose of the system.


Data quality, both in the entry of names for checking purposes and the original underlying data,
for large-scale databases of public records is a difficult problem. Because this system will use
multiple databases for verification of records, the problem is further compounded. The Social
Security database is known to have a high number of errors in name matches, as well as some
duplicate numbers. The Social Security Administration's (SSA) Office of the Inspector General
recently estimated that the SSA's 'Numident' file -- the data against which Basic Pilot checks
worker information -- has an error rate of 4.1 percent. A SSA official, testifying before
Congress1, indicated that if Basic Pilot were to become mandatory and the databases were not
improved, SSA database errors alone could result in 2.5 million people a year being
misidentified as not authorized for employment. This figure does not take into account errors in
the DHS database. Strong safeguards have to be built into the system that allow for individuals to
check the accuracy of the stored information and and to provide redress for employers or
employees that may be affected.


About 23,000 employers are using the voluntary system2. This represents .39% of employers in
the United States3. Scaling the system up would require at least a thousand-fold increase in users,
queries, transactions, and communications volume. As a general rule, each time a system grows
even ten times larger, serious new technical issues arise that were not previously significant.
Furthermore, the error rate can be expected to increase, rather than decrease.


A great many businesses do not currently have reliable Internet access to be able to use the
proposed web-based verification system. Requiring employers to use such a system will be a
burden for many, an impossibility for some, and will impose a huge cost in IT and create new
security issues for many small and medium-sized employers.


Data security, system integrity, and individual privacy must be anticipated from the beginning
and throughout the design, implementation, and operation of an electronic verification system.
Congress should establish clear policies and required outcomes for this system. More careful
thought is needed on total-system approaches to address identity authentication, authorization,
and data protection, along with incentives to ensure that these advances result in practical

1 June 7, 2007 testimony of Steve Schaeffer, Assistant Inspector General for the Office of Audit, Social Security Administration
before the Social Security Subcommittee of the House Ways and Means Committee.
2 U.S. Citizenship and Immigration Services September 25, 2007 Fact Sheet on E-verify,
3 June 7, 2007 Government Accountability Office testimony before the Social Security Subcommittee of the House Ways and
Means Committee cited 5.9 million employers in the U.S. as of 2004; the latest data was available.

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