Intending to you kill someone for robbing you is illegal as well if you are not in danger
Actually, that depends entirely on which state you live in. Some states under Castle Doctrine allow deadly force to prevent the commission of any felony in your home, including robbery.
That, so far as I know, does not apply to booby traps.
You're correct--the Castle Doctrine only pertains to places when you physically occupy them (home, or car/work in some states), so setting up something to injure or kill someone on another one of those premises does not fall within those guidelines.
I thought all that was necessary was to place warning signs. i.e. if you leave a big sign that says "warning this house is booby trapped and unsafe" that's sufficient to protect you against a burglar who sues you for the leg that your spring-loaded machete hacked off.
Actually, that depends entirely on which state you live in. Some states under Castle Doctrine allow deadly force to prevent the commission of any felony in your home, including robbery.
That, so far as I know, does not apply to booby traps.
http://en.wikipedia.org/wiki/Castle_Doctrine_in_the_United_S...