You know, a situation like this came up in the CC class I was in. The topic was No-Knock-Warrents. He said that they serve no knocks all the time and are a very useful tool in the aprehension of criminals. I agree, but the question that he didn't answer was...
During a no knock, do the LE officers entering always announce who they are? And how liable would a person be if it were found out to be the wrong house and an officer were to be injured?
When once a republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.
- Thomas Jefferson