That's not really how the system works, in most cases it would be a jury trial... admittedly, with all its major structural flaws in its current form.

However, even if the system is as very rotten as it is, just alone demonstrating and shining a light on it can not only overcome the blatant, rotten corruption of the fake justice system, but it could also force the system to further damage and pollute its legitimacy and...more importantly...get people to see the corruption. That alone could cause exponentially more damage to the fake legitimacy of the system, if people are actually paying attention and not doing whatever meaningless things most people do like watch the telescreen for their daily programming or obsessing about men playing with balls in various forms.