The use of deadly force in Indiana is justified when it's used to prevent bodily harm to one's self or others, or the stopping of a forcible felony. It may also be used to prevent or stop an attack or unlawful entry into one's home, vehicle, or property. This includes unlawful entry by police officers. This also applies to other's home when the defender is a relative, or has the authority to protect it. It is also expectable to use deadly force to prevent the hijacking of an aircraft.
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.