Defences - Home Invasion
In the case of a home invasion (that is, a serious criminal trespass in a place of residence), acting for a defensive purpose or to defend property can be complete defences to an offence , including murder, even if the defendant's conduct was not reasonably proportionate to the perceived threat [s15C Criminal Law Consolidation Act 1935 ].
This section is not available if the victim was an on-duty police officer, or if the defendant was themselves engaged in criminal activity that might have given rise to the threat, or if the defendant was affected by drugs (unless involuntarily taken, or prescribed or over-the-counter and used appropriately).