The Times reports that Martin Tankleff was just granted a second trial after spending 17 years in prison for a crime that he very likely didn't commit. If he's found not guilty, or, more to the point, if he's in fact not guilty, why doesn't he have the right to commit 17 years' worth of crimes "free of charge"? OK, maybe not 17 full years' worth, but you'd admit, I hope, that at least some of the jurisprudence of punishment is based on retribution, so can you discuss the role of his time served in future punishment deliberations? For instance, say he happens to commit a crime later in life, not out of some sense of entitlement, but for any of the other "normal" reasons (like passion!): how relevant should his time served be?