If you're an illegal alien you need to @%!*, but this is not the way to do things at all
It's basically left up to the discretion of police and similar authorities to judge who may and may or not be illegal and the only criteria people really have is based on looks and that, my friend, is called racial/ethnic profiling. I doubt any Irish or Eastern European illegals in that area will be receiving the same level of scrutiny.
What gets me is that the many (primarily) Mexican-Americans who have lived in the region for many, many generations (if not, their entire family tree's existence) are really no different "looking" from their counterparts who live just on the other side of the border in Mexico, yet will be subject to the same level of harassment from overzealous police as any other suspected illegal alien.
There's definite racism inherent in this policy. If you don't think so, take a look at this: