There are many reasons to doubt the deterrent effect of the death penalty. For one thing, many criminals may actually find the prospect of the death penalty less daunting (and thus, less effective as a deterrent) than spending the rest of their lives suffering in jail. Death by execution is generally fairly quick, while a lifetime in prison can be seen as a much more intensive punishment. Moreover, even if criminals preferred life in prison to the death penalty, it's not clear that a harsher punishment would effectively deter murders. Heinous crimes often occur in the heat of the moment, with little consideration for their legal repercussions1. Further, for a deterrent to be effective, it would have to be immediate and certain. This is not the case with the death penalty cases, which often involve prolonged appeals and sometimes end in acquittals2. Finally, the empirical evidence regarding the deterrence effect of the death penalty is at best mixed. Many of the studies that purport to show the deterrence effect are flawed, because the impact of capital punishment cannot be disentangled from other factors such as broader social trends, economic factors and demographic changes in a region2. Other studies have even suggested a correlation between the death penalty and higher crime rates. States such as Texas and Oklahoma, which have very high execution rates, also have higher crime rates than most states that do not have the death penalty2. 1 Amnesty International. "Abolish the Death Penalty." Accessed June 5, 2011. 2 "Saving Lives and Money." The Economist. March 12, 2009. Accessed June 5, 2011.