Survey of Published Polygraph Literature on Accuracy

Comprehensive survey of published polygraph research literature reporting overall accuracy levels across field and laboratory studies.

Literature survey of published polygraph accuracy studies. Compiled and averaged accuracy rates from field and laboratory investigations published through the late 1980s.

Abrams conducted a comprehensive survey of the published polygraph research literature, reporting an overall accuracy level of .89 across studies. This survey built upon Abrams' earlier 1973 review, which had found laboratory accuracy of 83% and field accuracy of 98% for studies conducted prior to 1963. The consistency of accuracy estimates across decades of research — from the pre-1963 studies through the late 1980s — demonstrated remarkable stability in polygraph performance despite changes in instrumentation, testing procedures, and scoring methods.

The stability of accuracy estimates across decades of research and methodological evolution suggests that the fundamental psychophysiological processes underlying polygraph detection are robust and reliable. The .89 overall accuracy figure is consistent with later meta-analytic findings, providing additional confidence in the estimate.

Background & Context

Stanley Abrams' 1989 survey of polygraph accuracy literature represented a critical milestone in the ongoing scientific debate about psychophysiological detection of deception. Published in "The Complete Polygraph Handbook" by Lexington Books, this comprehensive review arrived at a pivotal moment when polygraph testing faced intense scrutiny from both critics and proponents.

The survey built directly upon Abrams' influential 1973 review in the Journal of Forensic Sciences, which had reported laboratory accuracy of 83% and field accuracy of 98% for studies published between 1963 and 1973. By 1989, nearly two additional decades of research had accumulated, providing an opportunity to assess whether accuracy findings had remained stable across evolving methodologies, instruments, and testing techniques.

This work filled a crucial gap by providing an updated synthesis of polygraph accuracy literature spanning more than seven decades—from early studies in the 1920s through the late 1980s. Unlike individual validity studies focused on specific techniques or populations, Abrams' survey offered a panoramic view of the field's empirical foundation, directly addressing questions raised by the Office of Technology Assessment and other governmental bodies examining polygraph validity.

Research Design & Methodology

Abrams employed a comprehensive literature survey methodology, systematically reviewing and synthesizing published polygraph accuracy studies from inception through the late 1980s. The review encompassed both laboratory analog studies, where experimental conditions were controlled, and field studies conducted in real-world criminal investigations and security screening contexts.

The survey methodology aggregated accuracy rates across diverse research paradigms, including studies that varied in their:

• Testing techniques (relevant-irrelevant, control question, and concealed information tests)
• Verification criteria (confessions, judicial outcomes, independent panel decisions)
• Subject populations (criminal suspects, mock crime participants, security applicants)
• Instrumentation technologies (analog and early computerized systems)

Abrams acknowledged the methodological challenge that "it is almost meaningless to total and average these findings because of the great discrepancy in experimental paradigms and the instruments employed", yet argued that identifying convergent patterns across methodologically diverse studies strengthened confidence in accuracy estimates. The review drew upon both peer-reviewed journal articles and technical reports from law enforcement and government agencies, casting a wide net to capture the full range of available evidence.

Results & Key Findings

Abrams reported an aggregated overall accuracy rate of .880 (88%), or .89 when rounded, representing a comprehensive estimate across all types of polygraph testing and research designs. This figure was notably more conservative than his earlier calculations from the 1973 review.

Key findings across the decades of research included:

• Remarkable consistency over time: Accuracy estimates remained relatively stable from pre-1963 studies through the late 1980s, despite substantial changes in instrumentation and methodology
• Field vs. laboratory performance: Earlier analyses had shown field studies achieving higher accuracy rates (98%) compared to laboratory studies (83%), though the 1989 aggregated estimate blended these contexts
• Cross-technique convergence: Multiple testing formats—including relevant-irrelevant, control question, and concealed information approaches—produced accuracy levels in comparable ranges
• Alignment with contemporaneous reviews: The .89 figure aligned closely with other major reviews, including the Office of Technology Assessment's 1983 finding of .83 laboratory accuracy

The survey revealed that polygraph accuracy had maintained stable performance across dramatic technological evolution, from early pneumograph and galvanometer devices through sophisticated analog recording systems. This cross-era consistency suggested that the fundamental psychophysiological principles underlying deception detection—rather than specific instrumentation—drove accuracy outcomes.

Discussion & Significance

Abrams' 1989 survey provided crucial evidence that polygraph accuracy was not an artifact of particular methodological choices or historical periods, but rather represented a robust phenomenon observable across diverse research contexts. The finding that several decades of scientific study had consistently supported validity greater than chance strengthened the empirical case for polygraph testing in criminal investigation and security screening applications.

The stability of accuracy estimates from 1917 through 1989—spanning primitive lie detection experiments to sophisticated psychophysiological assessments—suggested that the core psychological and physiological responses to deception-relevant questioning were fundamental and measurable. This cross-temporal consistency provided important counterevidence to critics who argued that polygraph validity was limited to specific contexts or techniques. The .89 accuracy figure became a widely cited benchmark in subsequent polygraph literature and policy debates.

Importantly, later meta-analytic research would corroborate Abrams' estimate, with the American Polygraph Association's 2011 meta-analysis finding event-specific diagnostic polygraph accuracy of 89% with a 95% confidence interval of 83%-95%. This convergence across independent reviews strengthened confidence that the .89 figure represented a reasonable estimate of polygraph performance under field conditions.

Limitations & Considerations

While comprehensive, Abrams' survey methodology had inherent limitations that warrant consideration. The Office of Technology Assessment noted that many studies Abrams cited were excluded by later reviewers because they lacked external criteria of guilt/innocence, used inappropriate instrumentation, or employed outdated testing procedures. Additionally, some studies relied on unverified self-reports from popular magazines or attitude surveys rather than empirical validity data.

The aggregation methodology itself presented challenges. Different reviews varied in whether they differentiated accuracy for detecting deceptive versus truthful subjects, and in how they handled inconclusive results. Decisions about whether to exclude inconclusive results from accuracy calculations had the effect of inflating reported accuracy rates. The survey also could not fully address concerns about verification bias in field studies, where ground truth determination often relied on confession evidence potentially influenced by polygraph results themselves.

Finally, the survey aggregated studies with widely varying methodological quality, potentially giving equal weight to rigorously controlled research and less systematic field reports. The averaging approach obscured important variations in accuracy across different testing contexts, particularly the substantial differences between diagnostic testing of specific incidents and screening examinations for undisclosed information.

Practical Applications

Abrams' finding of 89% overall accuracy provided polygraph practitioners and policymakers with an empirically grounded benchmark for understanding test performance in operational settings. This estimate helped establish realistic expectations—polygraph testing is highly accurate but not infallible, performing substantially better than chance while still producing some errors. For criminal investigators, the .89 figure supported polygraph use as a valuable investigative tool while underscoring the need for corroborating evidence.

The demonstration of accuracy stability across decades reassured practitioners that continued evolution in testing techniques and instrumentation had not degraded performance. This historical consistency suggested that investment in examiner training and adherence to standardized protocols—rather than technological innovation alone—remained the key to maintaining high accuracy. For consumers of polygraph services, the survey provided context for evaluating individual test results within the broader framework of established accuracy levels across thousands of examinations spanning multiple decades.