Under s 15A of the Criminal Law Consolidation Act 1935 (SA) a person is entitled to use such conduct as he or she genuinely believes is necessary and reasonable to defend property from being taken, destroyed, damaged or interfered with; to prevent criminal trespass; to remove a trespasser; or to arrest someone unlawfully at large - as long as the conduct was reasonably proportionate to the threat the defendant genuinely believed to exist, and if the conduct resulted in death, the defendant did not act recklessly or intend to cause death.
However, see also: Home invasion where the requirement of reasonable proportionality does not apply.
It is a partial defence to a charge of murder (reducing the offence to manslaughter) in some circumstances [s 15A(2)].
Criminal trespass in relation to this defence is where someone comes on to a property with the intention of committing an offence (against the person or property) [s 15A(3)].
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