Peter Ellis' child abuse convictions have been quashed.

After three decades, the Supreme Court has called the investigation and Ellis' trial a miscarriage of justice.

It's found the evidence of an expert witness didn't inform the jury of other possible causes of the children's behaviours -- and simply, shouldn't have been admitted.

It also makes a point of saying the need for special care due to the complexity of the case was underestimated and created unprecedented challenges for those involved.

The Court's made a point the judgement shouldn't be read as a criticism of the parents involved. 

ZB Senior Reporter Chelsea Daniels joins Simon Barnett and James Daniels.

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