Come to think of it, why is the criminal justice system not "tested"? In other words, set up a mock situation where you know in advance who is innocent and who is not (because it's a setup), and run a mock trial by all the rules using actual jurors, and compare the outcome of the trial to the actual innocence or guilt of the actor?
Or not, if most of the incriminating information was eyewitness testimony, the #1 cause of wrongful convictions:
https://www.innocenceproject.org/
MY opinion of the US criminal justice system is that https://en.wikipedia.org/wiki/Blackstone%27s_formulation is almost definitely not being followed, with the bias far into the false-positive conviction camp.
Come to think of it, why is the criminal justice system not "tested"? In other words, set up a mock situation where you know in advance who is innocent and who is not (because it's a setup), and run a mock trial by all the rules using actual jurors, and compare the outcome of the trial to the actual innocence or guilt of the actor?