> There have been cases similar to this (but less dramatic) where the homeowners fired on the un-marked, un-announced police squad, and were (rightly!) vindicated under their states' respective castle or self-defense laws.

There have? Could you please cite them? In reading the Author's book, mentioned at the end of the article, I was lead to believe that the castle doctrine has pretty much eroded to the point that one has a reasonable sense of privacy in one's own home, buy if you're suspected of illegal activity you basically forfeit that right.