Southwest Border Security: Additional Actions Needed to Better Assess Fencing's Contributions to Operations and Provide Guidance for Identifying Capability Gaps, Report to Congressional Requesters [open pdf - 6MB]
"In fiscal years 2013 through 2015, Border Patrol recorded a total of 2.1 million estimated known illegal entries between ports of entry along the southwest border. In an effort to secure the border between ports of entry, CBP [U.S. Customs and Border Protection] spent approximately $2.4 billion between fiscal years 2007 and 2015 to deploy TI [tactical infrastructure] - fencing, gates, roads, bridges, lighting, and drainage infrastructure-along the nearly 2,000 mile southwest border. GAO [Government Accountability Office] was asked to review the use of border fencing along the southwest border. In this report, GAO examines (1) border fencing's intended contributions to border security operations and the extent to which CBP has assessed these contributions and (2) the extent that CBP has processes in place to ensure sustainment and deployment of TI along the southwest border and challenges in doing so. GAO reviewed CBP documentation and data and interviewed officials in headquarters and three southwest border locations. These locations were selected based on CBP's extensive investments in TI in such areas. GAO recommends that Border Patrol develop metrics to assess the contributions of pedestrian and vehicle fencing to border security along the southwest border and develop guidance for its process for identifying, funding, and deploying TI assets for border security operations. DHS concurred with the recommendations."
Government Accountability Office: http://www.gao.gov/