I would say the number should be ~100:1, however it is obviously unseemly to think about. However, for those people being like "no innocent man should ever go to jail", or "anyone who talks about such number is inhumane", they are just dodging the question, the fact of the matter is that whatever system you have there will be some ratio of innocents being convicted and guilty people being free, and trying to ignore that fact doesn't get you anywhere. The only way to have no innocents in jail is to never convict anyone, the only way to put all guilty people in jail is to ship the entire country off to jail. Since neither of this is possible it is nescecarry to deal in percentages and statistics. Personally I know alot of people on this forum are always complaining about how it takes 10 years worth of appeals before a murderer receives the death sentence, or how guilt people sometimes get off on technicalities, however its important to note that these thigns are in place to save innocent people and the fact that many guilty people benefit from them too is a nescacarry evil. There are many examples of innocent people being executed, there are obviously thousands of examples of innocent people being imprisoned. And unfortunately its usually the poor or mentally handicapped, people see a homeless guy with a mental disease and its VERY easy to stereotype that person as a criminal, so even some circumstantial evidence is enough, and someone like that doesnt have any loved ones to go and fight on their behalf in the appeals courts, or to hire a good lawyer, so once they go to jail they are essentially forgotten by society and left to rot.