Just off the top of my head, let's see : Extra border patrol officers required to attempt to control their illegal crossings, county/state run medical facilities they avail themselves of when necessary, food stamps/AFDC programs, social security benefits for their children, the extra costs of bilingual teachers in the school systems to educate their non English speaking children.

All of these items/services have a price tag illegals aren't contributing to, yet all come at a cost to the taxpayer and I know there are surely more I'm unaware of.

The bottom line to it all for myself is why a non citizen is even elligible for any benefits from the welfare system at all? I'd bet if the tables were turned and I were to illegally pass into Mexico and apply for ANY such social services from their government I'd most certainly be denied, if not arrested, but not here.