Frets is correct, there are many laws in each state, Texas being one of the weird ones. In Utah they would have to be in your house, and I mean IN not at the door step.

If you listen to the TOTN link at the top there are some really good points. Thats the whole point of that show; talking about the laws in different states for essentially the same type of crime and selfdefense.

People can confront crimes all they want but shooting people opens an entire can of worms, it really boils down to "did you fell threatend" and the courts will make the case based on your story.