Capital Punishment: Deterrent Effects

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In Dezhbakhsh and Shepherd’s (2006) article reviewing the study on the deterrent effects of capital punishment, the results suggested that capital punishment does have a deterrent effect. Dezhbakhsh and Shepherd used panel data for 50 states during the 1960-2000 time period to examine the deterrent effect using the moratorium as a “judicial experiment.” They compared murder rates for each state immediately before and after it suspended or reinstated the death penalty. There are many factors that affect crime-for example; law enforcement, judicial, demographic, and economic variables change only slightly over a short period of time (Dezhbakhsh & Shepherd, 2006). Therefore, changes in a state's murder rate quickly following a change in its death penalty law can be attributed to the legal change (Dezhbakhsh & Shepherd, 2006). Also, there are considerable cross-state variations in the timing and duration of the moratorium that began and ended in different years in different states, ranging from four to thirty years (Dezhbakhsh & Shepherd, 2006). These variations can strengthen our comparison-based inference, because observing similar changes in murder rates immediately after the same legal change in different years and in various states provides …show more content…

Shepherd (2004) used monthly murder and execution data that measured deterrence more precisely than the annual data of most capital punishment studies. Results from least squares and negative binomial estimations indicate that capital punishment does deter: each execution results in, on average, three fewer murders (Shepherd, 2004). In addition, capital punishment deters murders previously believed to be undeterrable: crimes of passion and murders by intimates (Shepherd,

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