claim: "... study after study has shown that the death penalty deters murders."
author: fred thompson
evidence_1: sep 12, 2017 ... a death penalty information center analysis of u.s. murder data from 1987  through 2015 has found no evidence that the death penalty deters murder or  protects police. instead, the evidence shows that murder rates, including murders  of police officers, are consistently higher in death-penalty states than in ...
evidence_2: regression models: ehrlich and others. by the mid 1970s, informed opinion  agreed that existing data showed no increased deterrence due to the death  penalty. a study by economist isaac. ehrlich broke that pattern. ehrlich  reexamined u.s murder and execution statistics for the period 1933-1969,  together with measures of ...
evidence_3: jun 11, 2007 ... statistical studies like his are among a dozen papers since 2001 that capital  punishment has deterrent effects. they all ... the illinois moratorium on  executions in 2000 led to 150 additional homicides over four years following,  according to a 2006 study by professors at the university of houston. speeding ...
evidence_4: it might seem that the prospect of receiving a death sentence would deter would- be murderers from committing such offenses. however, many studies on  deterrence and the death penalty do not support this idea, nor does the rate of  murders in states with the death penalty. the murder rate in states that do not  have the ...
evidence_5: jan 25, 2017 ... "[o]ur recent research shows that each execution carried out is correlated with  about 74 fewer murders the following year... the study ... the modern refereed  studies have consistently shown that capital punishment has a strong deterrent  effect, with each execution deterring between 3 and 18 murders.