"And folks still haven't answered the question (although Bill started to) as to what exactly is the problem that is so pressing as to allow the 4th Amendment to be violated. He alludes to schools, hospitals, social services, but brings no facts to the table. "

*sigh*...I was far too busy yesterday to bring precise quotes & web sites to support my worries....but I have heard TV interviews with politicians and social service administrators from various states explaining this very problem.
   And I'm 95% sure *I* posted something here a few months ago about a hospital near me..Holy Cross, in Silver Spring, MD. which was stating that they were either 'about to' or 'considering' quotas on emergency room services, because in the last few years they were under GREAT strain from increased demand by uninsured folks. I am trying to find the article or other information to see if they identified the groups by ethnicity..etc.

I would bet that 10 minutes on Google with some creative search terms would find enough 'facts' to cover the table. Social services in border states ARE struggling to deal with budgets, teacher shortages, textbook controversies, medical care crunches, prison population growth and other dire situations directly related to the rise of immigrant populations.
....I will see if I can find some of these statistics, but they are out there, whether you get the data from me, or from somewhere else.

I have no wish to see ANY child denied an education or medical care...but I think it IS reasonable to ask how we are supposed to give it to them in this state of chaos.