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Snapshots of Capital Punishment Trends

Summary:
Back in 1972, the US Supreme Court outlawed the capital publishment statutes in all 50 states by a 5-4 decision in the case of Furman v. Georgia (408 U.S. 238 [1972]). All nine members of the court wrote separate decisions (!), so the exact legal reasoning behind the decision was less than crystal-clear. But broadly speaking, the decisions held that the death penalty could only be constitutional if applied in a consistent, non-arbitrary, and non-discriminatory way.  Almost a half-century later, what are the big-picture patterns of capital punishment in the United States? Tracy L. Snell at the US Bureau of Justice Statistics lays out the patterns in "Capital Punishment, 2018 – Statistical Tables" (September 2020, NCJ 254786). Here's the pattern of US executions over time: One way of

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Back in 1972, the US Supreme Court outlawed the capital publishment statutes in all 50 states by a 5-4 decision in the case of Furman v. Georgia (408 U.S. 238 [1972]). All nine members of the court wrote separate decisions (!), so the exact legal reasoning behind the decision was less than crystal-clear. But broadly speaking, the decisions held that the death penalty could only be constitutional if applied in a consistent, non-arbitrary, and non-discriminatory way.  

Almost a half-century later, what are the big-picture patterns of capital punishment in the United States? Tracy L. Snell at the US Bureau of Justice Statistics lays out the patterns in "Capital Punishment, 2018 – Statistical Tables" (September 2020, NCJ 254786). Here's the pattern of US executions over time: 
Snapshots of Capital Punishment Trends

One way of interpreting this graph was that the death penalty was on its way to being imposed only a very low levels in the 1960s, but after the nine-way Supreme Court decision eliminating all state capital punishment laws inflamed the issue, capital punishment then had a resurgence for a time, before fading again.

There are currently about 2600 prisoners under sentence of death. However, for some years now the number being removed from this category (usually by legal appeal or commutation of sentence rather than by execution) has been exceeding the number added. 
Snapshots of Capital Punishment Trends
Here's a figure showing the racial mix of those under sentence of death. 
Snapshots of Capital Punishment Trends
Strong opponents of the death penalty will of course feel that one execution is too many. But the Gallup poll suggests that at the national level, supporters of the death penalty continue to outnumber opponents. Moreover, at the state level there will be places with greater support or majority opposition to death penalty. 
Snapshots of Capital Punishment Trends

This report doesn't address policy questions about the death penalty, like whether it may at least in some cases deter murder. My own suspicion is that this question is that statistical methods probably cannot answer this question--but of course, the lack of a clear-cut statistical answer means that each of us will weigh the various risks involved in different ways. For a blog post on this topic from a few years back, see "The Death Penalty and Deterrence: Why No Clear Answers?" (June 25, 2012). 

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