Castle Doctrine has moved this needle a bit, or at least grayed the line. For instance this is TN39-11-611(c). (bolded added by me)I have. one ran by a lawyer. he said it wasn't enough to think. you had to know what you are shooting at.
his point was if you don't know what/who you are shooting at, how are you going to be able to be cross examined and say you KNEW your life was in danger if you didn't know who it was.
"Any person (this would be the homeowner) using force intended or likely to cause death or serious bodily injury within a residence, business, dwelling or vehicle is presumed to have held a reasonable belief of imminent death or serious bodily injury to self, family, a member of the household or a person visiting as an invited guest, when that force is used against another person, who unlawfully and forcibly enters or has unlawfully and forcibly entered the residence, business, dwelling or vehicle, and the person using defensive force knew or had reason to believe that an unlawful and forcible entry occurred."
So anyone forcing their way into a dwelling uninvited can carry a legal presumption of reasonable fear of death/serious bodily harm. Now note the usage of "unlawfully". This is where it becomes complicated as later in the code there's the caveat following in (d)4
"The person against whom force is used is a law enforcement officer, as defined in § 39-11-106, who enters or attempts to enter a dwelling, business, residence, or vehicle in the performance of the officer's official duties, and the officer identified the officer in accordance with any applicable law, or the person using force knew or reasonably should have known that the person entering or attempting to enter was a law enforcement officer."
So obviously you can't just say "These cops aren't invited so I can claim a CD defense." However not what I've boldened in that section. People bursting in completely unannounced obviously negates any immediate "identification" of being LEO and takes a serious chunk out of anyone in that violent and chaotic scenario of someone having "reasonably should have known" being applied to them, don't you think?