esidential Directive 6, by William J. Krouse; and CRS Report RL32234, U.S. Visitor and Immigrant Status Indicator Technology Program (US-VISIT), by Lisa M. Seghetti and Stephen Vina. " CRS Report RL32562, Border Security: The Role of the U.S Border Patrol, by Blas Nunez-Neto. "For more information, see U.S. Ci