http://www.deathpenaltyinfo.org/article.php?scid=12&did=168Deterrence: States Without the Death Penalty Fared Better Over Past Decade
In the past ten years, the number of executions in the U.S. has increased while the murder rate has declined. Some commentators have maintained that the murder rate has dropped because of the increase in executions (see, e.g., W. Tucker, "Yes, the Death Penalty Deters," Wall St. Journal, June 21, 2002). However, during this decade the murder rate in non-death penalty states has remained consistently lower than the rate in states with the death penalty. (see Chart I, below).
These figures exclude Kansas and New York, which adopted the death penalty in 1994 and 1995 respectively. If these states are included in their proper categories, the results are even more dramatic:
As executions rose, states without the death penalty fared much better than states with the death penalty in reducing their murder rates. The gap between the murder rate in death penalty states and the non-death penalty states grew larger (as shown in Chart II). In 1990, the murder rates in these two groups were 4% apart. By 2000, the murder rate in the death penalty states was 35% higher than the rate in states without the death penalty. In 2001, the gap between non-death penalty states and states with the death penalty again grew, reaching 37%. For 2002, the number stands at 36%.
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lots more here:
http://www.deathpenaltyinfo.org/article.php?scid=12&did=167example:
FBI Report Reveals Murder Rate Rise in the South
According to the FBI's Preliminary Uniform Crime Report for 2002, the murder rate in the South increased by 2.1% while the murder rate in the Northeast decreased by almost 5%. The South accounts for 82% of all executions since 1976; the Northeast accounts for less than 1%. Read the report. (FBI Preliminary Uniform Crime Report 2002, June 16, 2003).