Robert Foye had absconded from Castle Huntly on two occasions Foye arrives at court

Robert Foye, 28, admitted raping the 16-year-old in Cumbernauld in August, 2006 while serving a 10-year sentence for attempting to murder a detective.

Lady Smith said Foye had previously absconded from Castle Huntly in 2005.

The judge said he will be sentenced on 6 May and told him she was considering a life-long restriction order.

Lady Smith said Foye had been assessed as posing "a very high risk of further violent offending".

Urgent review

She called for a full report from a psychologist accredited by the Risk Management Authority.

The court heard Foye had promised not to abscond again and had tested positive for drugs before absconding for a second time.

Foye was allowed out of Castle Huntly, near Dundee, to attend an Alcoholics Anonymous meeting but did not return.

He admitted raping the girl - six days later - on 24 August on a path near Dowanfield Road, Cumbernauld.

In January, Justice Secretary Kenny MacAskill announced that an urgent review would be carried out to see what lessons could be learned.