What happens inside the jury room?

The jury in mushroom cook Erin Patterson’s triple murder trial has retired to deliberate the verdict, guilty or not guilty. But what happens in there behind closed doors?  When they retire to the deliberation room, should they leave all of their personal beliefs and prejudices at the door? And is this even possible?  How does it work?  In this episode from our special series Inside the Jury Room which first aired in 2018 Damien Carrick sets out to find the answer.