The number of unauthorized immigrants in the U.S. is 11.3 million . Those that argue against the PIC claim that effective immigration policy has failed to pass since private detention centers profit from keeping undocumented immigrants detained . They also claim that despite having the incarceration rate grow " 10 times what it was prior to 1970 " , " it has not made this country any safer " ' Since the September 11 attacks in 2001 , the budget for Customs and Border Protection ( CBP ) , and U.S. Immigration and Customs Enforcement ( ICE ) , have nearly doubled from 2003 to 2008 , with CBP 's budget increasing from $ 5.8 billion to $ 10.1 billion and ICE from $ 3.2 billion to $ 5 billion and even so there has been no significant decrease in immigrant population . Professor Wayne Cornelius , professor Emeritus of Political Science at UC San Diego , even argued that it is so ineffective that " 92 – 97 % " of immigrants who attempt to cross in illegally " keep trying until they succeed " , and that such measures actually increase the risk and cost of travel , leading to longer stays and settlement in the US
September 11 attacks
September 11 attacks
Prison–industrial complex