In legal terms, Australians have a right of self-defence. While some states rely on the common law and others have it enshrined in statute, the right itself is never questioned. Moreover, juries consistently refuse to convict those charged with serious offences whenever self-defence is made out.
What we don’t have is the practical ability to exercise that right. Possessing any object specifically for the purpose of self-defence, lethal or non-lethal, is a criminal offence. There are many women, raped and/or murdered, who would have been liable to prosecution had they been carrying anything that might have saved them.
More Here: http://www.dailytelegraph.com.au/news/opinion/an-assault-on-our-right-to-selfprotection/news-story/f743f8b76f21a586a6efb2396c9b2f8d