Richard Lippke

Discussion in this paper focuses on how strongly we should prefer non-punishment of persons guilty of serious crimes to punishment of persons innocent of them. William Blackstone's version of that preference, expressed as a ten to one ratio, is first shown to be untenable on standard accounts of legal punishment's justifying aims. Somewhat weaker versions of that ratio also appear suspect. More to the point, Blackstone's adage obscures the crucial way in which there are risks to be assessed in setting up a criminal justice system - the risk that it will not be eff ective enough at apprehending and punishing serious off enders, as well as the risk that it will expose innocent persons to harsh punishment. I urge a balancing of such risks, and argue that the salient features of many contemporary criminal justice systems can be plausibly interpreted as attempting to achieve and maintain such a balance. We do not grant criminal defendants a presumption of innocence that the state must overcome with proof of guilt beyond a reasonable doubt in order to institutionally express a strong degree of preference for non-punishment of the guilty to punishment of the innocent. Instead, we do so in order to ensure that institutions of legal punishment have suffi cient scope while preserving their ability to accurately sort the guilty from the innocent

Imprisonment imposes very substantial losses and deprivations on people convicted of crimes. The question for which crimes imprisonment is an appropriate sanction is addressed employing both retributive and crime reduction approaches to the justification of legal punishment. Although there is not complete convergence between what the two approaches imply about its use, it is argued that both would reserve imprisonment for serious offenses, ones that inflict or threaten significant harms with moderate to high levels of culpability. Thus, neither approach supports the current use of imprisonment to sanction a range of lesser offenses. Key Words: crime reduction • imprisonment • retribution.