http://www.smh.com.au/articles/2004/10/07/1097089465121.html
"It is legal to lock children in immigration detention, the High Court ruled today.
The court dismissed an application by four Afghani children, aged between seven and 15, to be released from the Baxter immigration detention centre in South Australia because they claimed they were being held there unlawfully.
The court found the children were lawfully detained under the Migration Act."
Full Judgement - http://www.austlii.edu.au/au/cases/cth/high_ct/2004/49.html