The defamation laws in Australia are pretty strict.

To defame someone, you do not have to make up false things yourself. You might defame a person by repeating or replaying words spoken by someone else, for example an interviewee. It is no defence to claim that you were only quoting someone else. If you print or broadcast something defamatory, you could be taken to court, along with your producer, your editor or station manager and the person who said the words in the first place.http://www.thenewsmanual.net/Resources/medialaw_in_australia_02.html