I happened upon a thread on the high road while doing a google search for something else. The following quote is one of the responses to the thread:
"Never, EVER, fire a warning shot. Seriously, from a legal standpoint it is quite possibly the worst thing you could possibly do. A "warning shot" by it's very nature is an admission that you didn't think lethal force is justified, yet, by it's very nature you used lethal force to do it. Don't do it. If deadly force is justified then use it to stop threat not scare it." -insidious_calm
I thought I'd get everyone's opinions. I've heard this before, but never so succinct.