False Confessions

This comprehensive encyclopedia entry by Saul Kassin synthesizes research on false confessions, examining how innocent people are induced to confess through coercive interrogation tactics. The work documents how confession evidence corrupts polygraph chart interpretations and how false claims of polygraph failure are used to extract confessions, contributing to wrongful convictions.

Comprehensive literature review synthesizing case studies, meta-analyses, laboratory experiments, field observations, archival DNA exoneration analyses, and self-report surveys to document the causes, consequences, and remedies for false confessions.

Background & Context

This encyclopedia entry represents a comprehensive synthesis of false confessions research by Saul Kassin, one of the world's leading experts on the psychology of confessions. Published in 2014 within the Encyclopedia of Deception, the work addresses a critical problem at the intersection of forensic psychology and criminal justice: why innocent people confess to crimes they did not commit.

DNA exoneration cases have shed light on the problem of false confessions and the wrongful convictions that result. This scholarly review emerged from decades of research revealing that false confessions are not rare aberrations but systematic consequences of coercive interrogation practices. The article is particularly significant for polygraph professionals because it documents how confession evidence can corrupt polygraph interpretations and how false claims of polygraph failure are weaponized to extract confessions.

Research Design & Methodology

This is a comprehensive literature review and theoretical synthesis rather than an empirical study. Kassin integrated findings from multiple research methodologies to construct a complete picture of false confessions:

• Individual and aggregated case studies involving singular instances of proven false confessions
• Naturalistic observations of live and videotaped police interrogations; archival records; self-report methods; and laboratory and field experiments
• Meta-analytic findings on deception detection accuracy
• DNA exoneration case file analyses

The review examines the three-stage process of false confessions: (1) misclassification errors where police target innocent suspects based on flawed deception detection, (2) coercive interrogation tactics that break down resistance, and (3) downstream consequences where confessions corrupt other evidence. After the Supreme Court ruled inadmissible confessions extracted by physical coercion, a psychological approach to interrogation developed that relied instead on trickery and deception.

Results & Key Findings

Polygraph results are susceptible to confession bias. Polygraph examiners interpret ambiguous physiological charts as indicating deception when they are told the suspect has confessed (Elaad, Ginton, & Ben-Shakhar, 1994). This forensic confirmation bias represents a critical threat to the independence of evidence.

False polygraph claims are common in false confession cases. American police are permitted by law to lie about the presence of incriminating evidence (e.g., a failed polygraph)—even if that evidence does not exist. Case studies document numerous instances where suspects were falsely told they failed polygraph examinations, leading to false confessions.

Key findings on deception detection and interrogation include:

• A meta-analysis of 144 samples containing 9,380 speakers found that deception detectability did not differ according to motivation levels, emotional involvement, or interview format
• Those who trained in Reid technique lie detection were significantly less accurate, more confident, and more biased toward seeing deception; experienced police detectives exhibited the same erroneous and biased responses
• Most interrogations last from 30 min to 2 hr, with police estimating their longest interrogations averaging 4.21 hr
• Confessions corrupt contemporaneous judgments including polygraph chart interpretations, handwriting comparisons, fingerprint matches, and even DNA mixture interpretations

Discussion & Significance

This review establishes that false confessions result from a predictable sequence of psychological processes, not individual pathology. The findings have profound implications for polygraph practice. When examiners know a suspect has confessed, their interpretation of ambiguous physiological data shifts toward deception—creating an illusion of independent corroboration when the confession actually contaminated the polygraph reading.

The evidence on false polygraph claims is equally disturbing. Data from cases of undisputed false confessions has demonstrated that false assertions that a suspect has failed a polygraph when they have not has caused suspects to falsely confess. Some suspects mistakenly perceive that failing a polygraph reflects absolute proof of guilt and that lying about such certain guilt would render them even more culpable.

The article challenges fundamental assumptions about evidence independence in criminal justice. Rather than providing objective corroboration, confession evidence systematically biases other forensic assessments—including polygraph interpretations, eyewitness identifications, and expert judgments. This "corroboration inflation" creates a false sense of certainty that innocent suspects are guilty.

Limitations & Considerations

As a literature review rather than original research, this work synthesizes existing studies with their inherent limitations. Laboratory studies cannot fully replicate the high-stakes pressures of actual criminal interrogations. Academic research in the psychology and law field primarily relies on student or volunteer samples in staged exercises, methodological features that lack ecological validity.

The polygraph-specific findings cited come primarily from the 1994 Elaad study, which examined only one aspect of confirmation bias. The legal permissibility of lying about polygraph results varies by jurisdiction, and the article does not extensively analyze the ethical boundaries or legal constraints on such deception.

Additionally, while the review documents that false polygraph claims contribute to false confessions, it does not quantify the prevalence of this tactic or assess whether certain populations (juveniles, individuals with intellectual disabilities) are disproportionately vulnerable to it.

Practical Applications

This research demands fundamental reforms in how polygraph examinations interface with criminal investigations. Examiners must be shielded from knowledge of confession evidence to prevent confirmation bias. When charts are ambiguous, knowing the suspect confessed can unconsciously push interpretations toward deception. Blind testing procedures—where examiners score charts without contextual information about confessions—are essential.

For interrogation practices, the use of false polygraph claims must be recognized as a high-risk tactic that can produce false confessions. The best remedy would be for the courts to suppress any statement made by suspects after they have been told that polygraphs indicated that they were lying. Examiners should understand that their profession's credibility is undermined when polygraph results—real or fabricated—are weaponized to coerce confessions from potentially innocent people.