Marion Correctional Institution is being investigated over the death of a prisoner who died from an apparent drug overdose, according to new evidence released to the court.
The court heard that an inquest into the death last year was suspended due to an unknown illness.
A report by the Independent Commission Against Corruption (ICAC) concluded that there were “no credible allegations of institutionalised misconduct”.
A coroner’s inquest in May last year concluded that the death was a “potential suicide”.
The ICAC report found that the prisoner was “subjected to physical and sexual abuse, and he was severely depressed”.
The report also concluded that he was “depressed, mentally ill, unwell, and unable to control his behaviour”.
Marion is the third correctional facility to be investigated by the ICAC in the past week.
The first case was reported on Friday when the NSW Police force announced that it had launched an investigation into the prison.
On Thursday, the Australian Federal Police announced it had also launched an inquiry.