In its final report, the 9/11 Commission concluded that
funding and completing a "biometric entry-exit screening system" for travelers to and from the
United States is essential to our national security. The commission noted that the United States has
built the first phase of a biometric screening system known as US-VISIT, and recommended that the
"patchwork" of other border screening systems be consolidated with US-VISIT to serve as the basis
for a single system to streamline border inspections. This report provides an overview of biometric
technologies and the major U.S. biometric border screening systems, including US-VISIT, and
discusses issues such as cost, performance, and user acceptance. Based in part upon the commission's
recommendations, Congress included biometric provisions related to entry/exit control in the
Intelligence Reform and Terrorism Prevention Act of 2004 (P.L. 108-458). This topic will probably
continue to be of interest to the 109th Congress. This report will be updated as needed.