Over 500,000 illegal immigrants are believed to be residing in the United States, despite receiving deportation orders. In the recent years, U.S. Immigration and Customs Enforcement (ICE) began launching advanced efforts to capture undocumented immigrants, or “fugitive aliens” as they are known to immigration enforcement officials. “Fugitive aliens” constitute immigrants who sought asylum in the U.S. but were rejected and ordered to leave, or those who were caught entering or living in the country illegally and failed to show at their deportation hearings. ICE officials maintain that they do the best job possible with the resources available, and that their primary focus is to deport illegal immigrants who have committed crimes in the United States. Despite the 500,000 immigrants defying deportation orders, immigration enforcement still appears to be effective. Nearly 350,000 illegal immigrants were deported in 2007, and approximately 34,000 deportation arrests were made in 2007, a 50% increase from 2006. Immigrants who receive deportation notices and don’t have criminal histories are often given a specified amount of time to leave the country, and are not forcibly removed by U.S. officials. As such, deportation notices sometimes go ignored and individuals continue to remain living in the United States. Provided that criminal involvement is avoided, it not uncommon for undocumented immigrants, even those with deportation orders, to live their entire life undetected in the United States. It is estimated that a total of over 11 million illegal immigrants resided in the United States in 2007.