It was one of the most watched criminal court cases in history, and now it's back.

Mushroom killer Erin Patterson's appeal against her conviction for murdering three lunch guests and attempting to murder a fourth begins this week.

Today, RMIT criminologist and lawyer Brianna Chesser, on why Patterson's lawyers argue she's been the victim of a miscarriage of justice.

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Brianna Chesser, RMIT criminologist and lawyer