"Persons who believe that they are in imminent peril of bodily harm [may] use such non-deadly force as is reasonably necessary in the circumstances to protect themselves. . . . Before resorting to the use of deadly force, the person attacked must attempt retreat if he or she is consciously aware of an open, safe, and available avenue of escape. . . . The only exception in Rhode Island to the obligation to attempt retreat was created by statute." State v. Quarles, 504 A.2d 473 (R.I. 1986)
It is considered use of "reasonable force" to kill an intruder in one's home as long as the owner felt they were in danger of serious injury or death.
Castle Laws are laws that address the use of force when defending one's self inside their home, or on their property. Some states expand this to vehicles, and the person's place of work. Castle Laws generally include: the places where this law applies, the requirements fro use of deadly force, if there is a duty to retreat, the amount of force that maybe used in defending one's self or others. These vary widely from state to state.