Border Wall
CRS - Border Security Barriers along US International Border (The San Diego fence, combined with an increase in agents and other resources in the USBP’s San Diego sector, has proven effective in reducing the number of apprehensions made in that sector,but there is considerable evidence that the flow of illegal immigration has adapted to this enforcement posture and has shifted to the more remote areas of the Arizona desert. ..Study looks at costs, effectiveness, environmental impact and migrant deaths ... 12-2006)
Migrant Deaths
BMI- The Funnel Effect & Recover Bodies of Unauthorized Migrants In Pima County, 1990-2005 (A national border enforcement strategy that funneled illegal immigrants through Southern Arizona from Texas and California led to a dramatic increase in illegal-entrant deaths in Southern Arizona. BMI’s findings unambiguously confirm previous evidence that U.S. border-enforcement policies did create the funnel effect and that it is indeed the primary structural cause of death for thousands of unauthorized men, women, and children from Mexico, Central America, and South America who have tried to enter the United States.)
Enforcement
PPIC - Holding The Line -The Effect of the Recent Border Build-up on Unauthorized Immigration (There is no evidence that the INS has achieved its primary goal of reducing both unauthorized crossings and the number of unauthorized persons living in the United States ...2002)