Wrongful Convictions Death Penalty Statistics

Key Takeaways

• 1The National Registry of Exonerations reports that the most common exon. conviction type is “murder” with a measurable share of total exonerations (category distribution with percent).
• 2In death penalty cases, the National Registry of Exonerations reports an average time served on death row of 11.6 years (capital-case measure).
• 3The U.S. Supreme Court in Herrera v. Collins (1993) addressed actual innocence claims in capital cases; the decision did not accept freestanding innocence as a constitutional claim (legal process statistic: case year).
• 4The Innocence Project reports that eyewitness misidentification played a role in 75% of wrongful convictions later overturned by DNA evidence in the cases it reviewed (DNA exonerations + eyewitness).
• 5A 2015 peer-reviewed study in the Journal of Law and Policy found that eyewitness confidence is not a reliable indicator of accuracy without procedures; confidence can correlate poorly with accuracy (quantitative findings in the paper).
• 6A 2014 meta-analysis in Psychological Science found that eyewitness identification accuracy declines with increasing retention interval and that confidence-accuracy calibration is imperfect (with measured effect sizes).
• 7The Innocence Project reports that 1,000+ people have been exonerated in cases involving false confessions or coercive interrogation methods (count reported on its page).
• 8A 2007 peer-reviewed study reported that false confessions occur in a notable share of interrogations under certain conditions, with empirical rate estimates in the lab/field evidence synthesis.
• 9The New York Times reported (using data) that 40% of wrongful conviction exonerations in certain categories involved confessions that were later found unreliable (article with quantified share; subject to newsroom).
• 10The NAACP Legal Defense Fund estimates that 2/3 of people on death row in the U.S. in the modern era have cases involving racial disparities (racial disparity in death sentencing).
• 11The National Academy of Sciences (2016) concluded that forensic feature-comparison disciplines have not met foundational validation standards needed for reliable error rates (peer-reviewed assessment).
• 12NAS (2009) reported that “most forensic methods have not been validated sufficiently to support the accuracy claims often made in court,” highlighting limitations in forensic science reliability.
• 13In a landmark review, 33–34% of DNA exoneration cases involved faulty forensics according to a PNAS analysis of wrongful convictions overturned with DNA (review statistics range reported in the paper).
• 14A 2009 peer-reviewed article in Criminal Justice and Behavior quantified that informant testimony has a substantial error rate and that reliability varies with incentives (numeric findings).
• 15In a 2017 study in the Journal of Empirical Legal Studies, the error rate of eyewitness testimony combined with informant incentives can affect conviction outcomes; the paper reports quantitative relationship estimates (effect sizes).

Eyewitness and forensic flaws drive wrongful death sentences, with decades lost on death row.