Holding the Line, The Effect of the Recent Border Build-up on Unauthorized Immigration by Public Policy Institute of California.  Study which finds that increasing resources to patrol the borders has had little to no effect on reducing unauthorized migration, but has merely channeled migrants to more remote crossing points, increasing the number of fatalities along the border.

Immigration Enforcement by Local Police: The Impact on the Civil Rights of Latinos (PDF) by National Council of La Raza.  Concludes that history has shown that collaboration between the INS and local law enforcement has resulted in an erosion of community trust, civil rights violations, and litigation.