The former Immigration and Naturalization Service estimated that as of January 2000 the total unauthorized immigrant population residing in the United States was 7 million. This total includes those who entered the United States illegally and those who entered legally but overstayed their authorized period of stay. A more recent study estimated that there were about 10 million illegal aliens living in the United States as of March 2005. The study estimated that nearly 700,000 aliens entered the United States illegally or overstayed their authorized period of stay each year between 2000 and 2004. Some illegal aliens in the United States have been arrested and incarcerated in federal and state prisons and local jails, adding to already overcrowded prisons and jails. On April 7, 2005, we issued a report on criminal aliens that were incarcerated in federal and state prisons and local jails. Our report contained information on the number of criminal aliens incarcerated, their country of citizenship or country of birth, and the cost to incarcerate them. Congress also requested that we provide information on the criminal history of aliens incarcerated in federal and state prisons or local jails who had entered the country illegally. For a population of aliens that entered the country illegally and were incarcerated in federal or state prisons or local jails, this report addresses the following questions: (1) How many times have they been arrested? (2) How many and what type of criminal offenses have they been arrested for? (3) What states were they arrested in?
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