The Department of Homeland Security (DHS) established the U.S. Visitor and Immigrant Status Indicator Technology (US-VISIT) program to collect, maintain, and share data on selected foreign nationals entering and exiting the United States at air, sea and land ports of entry (POEs). These data, including biometric identifiers like digital fingerprints, are to be used to screen persons against watch lists, verify visitors' identities, and record arrival and departure. GAO was asked to review implementation at land POE facilities and in doing so GAO analyzed: (1) efforts to implement US-VISIT entry capability; (2) efforts to implement US-VISIT exit capability; and (3) DHS's efforts to define how US-VISIT fits with other emerging border security initiatives. GAO reviewed DHS and US-VISIT program documents, interviewed program officials, and visited 21 land POEs with varied traffic levels on both borders.