Nobel Prize vs Proof that the Death Penalty MUST kill innocents

holmes writes:It was claimed by two different posters that the existence of a death penalty in any judicial system MUST result in an innocent person being executed. That is to say there is absolutely no set of rules which can be made which would prevent innocent people from being executed.They also said that if one could come up with such a set of rules they'd likely get a Nobel Prize. I am riffing on that claim to draw people into a discussion of what system could elminate the possibility of innocent people ever getting the death sentence, though there might be one available in the system.To start with I have given an example case which I would hope is beyond dispute whether the person is guilty, in order to start crafting rules of evidence.