It is an offence to import, or try to import, prohibited drugs.
The prosecution must prove that the accused intended to import the substance. In other words, a person will be acquitted if they did not realise that they were carrying drugs.
It is also an offence under the Commonwealth Criminal Code to assist or be knowingly concerned in any illegal importation of drugs. The prosecution must prove that the accused was fully aware of what was going on and performed some act such as providing money. Mere knowledge or inaction does not establish the offence.