12.11 The Australian Constitution does not expressly require that criminal offences include the element of mens rea.
Principle of legality
12.12 The principle of legality provides some protection to the principle of mens rea. When interpreting a statute, courts will presume that Parliament did not intend to create a strict liability offence, unless this intention was made unambiguously clear.
12.13 In He Kaw Teh (1985), a majority of the High Court interpreted a provision in the Customs Act 1901 (Cth), which made it an offence to import drugs, as requiring the prosecution to prove that the defendant had an intention to traffic the drugs. Gibbs CJ stated:
[i]t is unlikely that the Parliament intended that the consequences of committing an offence so serious should be visited on a person who had no intention to do anything wrong and no knowledge that he was doing so.