Amen. If the school doesn't run background checks, any responsible parent should immediately cross that school off the list for consideration. In addition, there are ways of running a private background check, something many of us parents still do.
I just enrolled my son into a private school here in CO. It's always in the back of your mind these days that there are perverts working with kids, but now I'm worried that we didn't ask more questions. I think I'll inquire about this on Friday when we go to back to school night--don't know how to do it in a delicate manner though. "Are any of your teachers perverts?" might be a bit too blunt.