Current immigration law and enforcement appear to be an utter failure. Jeanne D’Arc points out that:

Between 1994 and 2002, we spent $20 billion militarizing our southern border and trying to keep out or send back immigrants, and it’s hard to see that as anything but a complete waste of money.

and looks at an alternative approach to discussing the issue:

I wondered if maybe there was another way to frame the issue: Should we continue to pour massive ammounts of money into a policy that clearly doesn’t work (and also kills people)? Should we give up? Or should we spend that money in ways that will improve life for people in Mexico so that they aren’t forced to come here to work? What good could we do with $20 billion over the next eight years?

Perhaps money will talk. This same approach is starting to make inroads against the drug wars.