This article examines the dilemmas faced by undocumented immigrants within the criminal justice system vis-ˆ-vis the immigrant detention center and the resulting implications for social work. It explores the new realities for undocumented immigrants in the United States, including an explanation of state policies that have led to the criminalization of immigrants. The criminal justice and homeland security responses to undocumented immigrants, including the trend toward the privatization of immigration detention centers are analyzed. Finally, the implications of these trends for social work practice are discussed.