From time to time, we realized a innocent person has been put in prison. What cause it to happen, could be anything. But frequently, its the fault of people. eg police officers, charge with investing the crime, by choosing to be trusting to the self proclaim victim or in their mind pre determine who must be guilty. Other time, it is because the prosecutor withholding information, that undermine his case in court. Sometime it is due to the jury, because professionals can't serve as jury (in Australia e.g. people with PhD, lawyer, doctors, cops, can't be jury). How should we reform the system?