Unfortunately, it's the same as no-knock warrants. You may have the perfect right under the law to shoot the people bursting into your bedroom in the middle of the night, but it won't matter - you'll still either be killed or convicted and sent to jail, whether it's legal or not. There are plenty of supporting instances in the news or on google, and nothing is really being done about it.
I don't know how people can say "oh, this is just an unfortunate incident" when it happens every couple of weeks. It's not drug dealers getting killed, it's average law-abiding citizens who are just trying to protect their families.
If I were a policeman, I would refuse to participate in such things. I'd probably get fired for it, but there's no way I'm breaking into someone's home without announcing who I am and giving them a chance to see ID.