http://www.commonvoice.com/article.asp?colid=4951
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, the US Justice Department issued a report on criminal aliens that were incarcerated in federal and state prisons and local jails.
In the population study of 55,322 illegal aliens, researchers found that they were arrested at least a total of 459,614 times, averaging about 8 arrests per illegal alien. Nearly all had more than 1 arrest. Thirty-eight percent (about 21,000) had between 2 and 5 arrests, 32 percent (about 18,000) had between 6 and 10 arrests, and 26 percent (about 15,000) had 11 or more arrests. Most of the arrests occurred after 1990.
They were arrested for a total of about 700,000 criminal offenses, averaging about 13 offenses per illegal alien. One arrest incident may include multiple offenses, a fact that explains why there are nearly one and half times more offenses than arrests. Almost all of these illegal aliens were arrested for more than 1 offense. Slightly more than half of the 55,322 illegal aliens had between 2 and 10 offenses.
More than two-thirds of the defendants charged with an immigration offense were identified as having been previously arrested. Thirty-six percent had been arrested on at least 5 prior occasions; 22%, 2 to 4 times; and 12%,1 time.
Sixty-one percent of those defendants had been convicted at least once; 18%, 5 or more
times; 26%, 2 to 4 times; and 17%, 1 time. Of those charged, 49% had previously been
convicted of a felony: 20% of a drug offense; 18%, a violent offense; and 11%, other felony offenses. Twelve percent had previously been convicted of a misdemeanor.
Defendants charged with unlawful reentry had the most extensive criminal histories. Nine
in ten had been previously arrested. Of those with a prior arrest, half had been arrested
on at least 5 prior occasions.
Fifty-six percent of those charged with a reentry offense had previously been convicted
of a violent or drug-related felony. By contrast, under half of those charged with
alien smuggling, a third of those charged with unlawful entry, and just over a quarter those
charged with misuse of visas and other charges had previously been arrested. The criminal
histories of these defendants were generally less extensive: more than 70% had been
previously arrested fewer than 5 times.
Sources: US Department of Homeland Security, US Immigration and Customs Enforcement, National Security Institute, National Association of Chiefs of Police, US Department of Justice