True. That invites the question, can we know what proportion of the prosecuted are guilty? I think we can, but we would need to hire a pool of people to secre

True. That invites the question, can we know what proportion of the prosecuted are guilty? I think we can, but we would need to hire a pool of people to secretly serve as test subjects -- to commit a crime (or not) then be charged for it (or not) and tried for it, and only reveal their true status after their case reached a verdict. Only then could we get a good idea how fair the legal system really is. The invention of such a clandestine "Justice League" would be a pretty interesting way to measure whether any local or national police/justice system is fair and effective.