I found this report to be very interesting. It reminded me of a CDC report showing that 60% of new syphillis cases are from the 2% of the population that are homosexuals. Here, we see 9% of the AZ population are illegals from Mexico, and they constitute 22% of the violent crimes committed (at least in Maricopa County). There is a graph that lists various crimes to illustrate what percentage is committed by illegals. There is only one that is below that 9% mark that denotes the percentage of illegals, but almost every other crime shows higher percentages of illegals being arrested (by that I'm referring to higher percentage than the 9% who are illegal). If it was Congress instead of crime, they'd be over-represented, as they are so in nearly every crime category.
The costs are very high. The report is dealing with just one state or county, but of course, there are illegals all over the country. I wonder how the stats compare nationally. Some people speak of the financial benefits of illegals (actually they usually just say "immigrants" and group them all together) and I also wonder how those alleged economic bennies match up to all these costs of criminal activity, adding also NON-violent crimes, as well as other costs to our society like welfare-type assistance for illegals.