In short
In the Northern Territory, euthanasia has been legal for a short time (1997-1998). However, the Australian federal government overturned this: only 9 months after the act came into effect, it was repealed by the federal parliament. Human rights law exists at Federal level and covers the Territories.
Territories now, unlike the states in Australia, no longer have the authority to pass such laws. Movement toward illegal importation of Nembutal becoming more common. Using gas is also becoming popular. At this moment, legislators in the Northern Territory are seeking to get their freedom back.
It is possible to stop treatment and to use advance directives in situations where a person is no longer able to communicate. There are also schemes in the field of palliative sedation.