They did not father but must pay.

Changes to child support for fathers

on 16 February, 2011 - 09:07

A recent article by the Australian has stated that government figures revealed almost 600 instances of men compelled to financially support children they did not father. A men's rights group has called for mandatory paternity testing of all babies.
In the overwhelming majority of these cases, the courts have not forced mothers to pay back the money they have received. Of the 586 cases, only 74 mothers have been told to pay back the money. Those reparations total in excess of $533,000.
The figures, from the government's Child Support Agency, prompted Men's Rights Agency director Sue Price to call for mandatory DNA testing at birth.
Do you think the government should implement mandatory DNA testings?
For up to date changes in family legislation try TimeBase's LawOne.

Source: http://www.timebase.com.au/topics/2011/02/16/changes-child-support-fathers