Sooo, out in the country, you approach a house, nicely, in the daylight, shouting your presence. Because we all know there is a shotgun just behind that door.
And this is the way police officers should approach any house.
With all the death by police, (and doggy deaths) after a no-knock raid (often on the wrong house) i am surprised we are not seeing entire SWAT teams dying, just as a precaution.
Well, there are several no-go zones... so it may have happened and we just haven't heard about it.