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The New South Wales Attorney-General Michael Daley today announced Kathleen Folbigg聽聽after having served 20 years for the murder of three of her infant children and the manslaughter of a fourth child. She has already been released, and won鈥檛 serve the rest of her 30-year sentence.

Daley had seen the preliminary findings of a second judicial inquiry led by former NSW Chief Justice Thomas Bathurst, which found there was reasonable doubt as to Folbigg鈥檚 guilt for each of the offences.

At trial, the prosecution had relied on the statistical improbability of so many of her children dying accidentally. However, at the second inquiry, this reasoning was called into question by fresh scientific evidence pointing to possible medical causes of the deaths.

Her two daughters were found to have a聽, which is associated with sudden infant death.

One of her sons may have had an underlying neurological condition such as聽, which may have caused his death.

In relation to the death of her other son, Bathurst said the new medical evidence regarding the other three deaths undermined some of the reasoning used in the case against her. He聽聽鈥渢he coincidence and tendency evidence which was central to the (2003) Crown case falls away鈥�.

At trial, and in the first inquiry, the prosecution had argued Folbigg鈥檚 diary entries relating to the deaths of her children could be interpreted as admissions of guilt. But having been presented with聽, Bathurst聽聽the diary entries as 鈥渢he writings of a grieving and possibly depressed mother, blaming herself for the death of each child鈥�.

Whereas at trial Folbigg had been presented by the prosecution聽聽鈥淎ustralia鈥檚 worst female serial killer鈥�, Bathurst聽聽he was 鈥渦nable to accept [鈥�] the proposition that Ms Folbigg was anything but a caring mother for her children鈥�.

The Folbigg case is a particularly tragic case, but it鈥檚 not unprecedented. The criminal justice system carries an inbuilt risk of wrongful conviction. Ad hoc commissions of inquiries like the Folbigg inquiry are inefficient and expensive. The system needs reform.

The Folbigg case is yet another demonstration that Australia needs a Criminal Cases Review Commission (CCRC) 鈥� a statutory body working at arm鈥檚 length to investigate claims of wrongful conviction.

A CCRC would have the powers and resources to investigate defendants鈥� claims to have been wrongfully convicted. Claims found to have substance can be referred back to the court of criminal appeal. Standing CCRCs have proven to bring a聽聽to the accuracy of criminal justice systems overseas.

Preferably, it would be a single federal body covering all jurisdictions, or failing that, one for each jurisdiction.

Cases where miscarriages of justice are identified years later, such as Folbigg鈥檚, do happen.

In the last decade, Jason Roberts in Victoria聽聽in a retrial after serving two decades in prison for the murder of two police officers.

Scott Austic in WA was聽聽in retrial after serving 12 years for the murder of his partner who was pregnant with his child.

David Eastman in the ACT was聽聽in a retrial after serving 20 years for the murder of assistant police commissioner Colin Winchester.

Henry Keogh in SA was聽聽following an exceptional second appeal having served 20 years for the murder of his fianc茅.

In these cases, as in the Folbigg case, the subsequent proceedings considered fresh forensic evidence or highlighted flaws in the original proceedings or investigation.

It鈥檚 a primary goal of the criminal justice system to avoid the searing injustice of a wrongful conviction. This goal is pursued through principles such as the presumption of innocence and the requirement of proof beyond reasonable doubt.

But absolute certainty in guilt isn鈥檛 feasible and isn鈥檛 required. A risk of error is run and occasional errors should be expected. They will not necessarily be corrected on appeal, where the defendant is no longer presumed innocent and weight is given to the 鈥渇inality principle鈥�. This means the jury verdict is ordinarily considered final, for the sake of efficiency and to provide the parties and society with closure.

Following an unsuccessful appeal, the finality principle bites still harder and it becomes significantly more difficult for the wrongly convicted defendant to achieve justice. The imprisoned defendant will face an almost insurmountable challenge in persuading the government (or, in some jurisdictions, court) to order an inquiry or an exceptional subsequent appeal. In order to achieve justice, defendants like Folbigg, Roberts, Keogh and Eastman require remarkable resilience, as well as supporters on the outside.

The criminal justice system needs to do more to address the statistical certainty of the occasional wrongful conviction. Overcoming this injustice shouldn鈥檛 demand superhuman reserves of fortitude, or the chance arrival of a champion.

The systemic risk of wrongful conviction demands a systemic solution.

Other developed nations have recognised that CCRCs are well-suited to this task, including England and Wales, Scotland, New Zealand, and Canada. Australia should follow in this path.

The extent of the change can be carefully calibrated through the design of the CCRC. The CCRC is a gatekeeper, and legislation can determine how widely the gate is opened.

The call for this key piece of criminal justice infrastructure isn鈥檛 new. The Australian Law Council聽. Commentators have called for an Australian CCRC聽.

Last year former High Court Justice, Michael Kirby,聽聽that 鈥渟uch a commission is needed鈥�. And the聽Sydney Institute of Criminology聽is currently calling on governments to take steps to establish an Australian CCRC.

Cases like Folbigg鈥檚 demonstrate that this reform is urgently required.

This article was first published in The Conversation as聽. Professor David Hamer is an expert in evidence law, with a special interest in聽the way criminal courts deal with evidence in determining whether to convict or acquit defendants. Dr Andrew Dyer is a Senior Lecturer in the Sydney Institute of Criminology, where he researches the intersection between criminal law and human rights law.聽

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