[TheMercenary]

I think many states have laws concerning what they can be made of, i.e. wood or other substances that can degrade and not be a hazzard, but not some thing like concrete. As long as someone continues to keep them up I don't think most people care if they are there or not.

I agree with Cloud, and I have heard from other people that it is a common thing among Hispanic peoples. The exact spot where they died becomes sacred.