Home › Polygraph Research › Researchers › Jan Stefan Widacki
Researcher file
Jan Stefan Widacki
Polygraph examination, deception detection, criminology, and forensic science with emphasis on historical development and emerging technologies
Researcher record
About Jan Stefan Widacki
Jan Stefan Widacki (born 6 January 1948 in Kraków) is a Polish lawyer, historian, essayist, academic (professor since 1988), diplomat and politician. In 1969, Widacki graduated from law at the Jagiellonian University. He was a faculty member of the John Paul II Catholic University of Lublin (from 1977) and the University of Silesia (1983–1990). Studies on polygraph examinations in the Department of Criminalistics at the University of Silesia began in 1977 when Jan Widacki joined the Department and brought with him the first polygraph equipment from the Jagiellonian University in Krakow. He is professor of criminology and criminal justice, Frycz Modrzewski Krakow University. Prof. Jan Widacki LL.D. Editor-in-Chief of European Polygraph. Beyond academia, he was a vice minister of interior in the Cabinet of Tadeusz Mazowiecki (1990–1992), Polish ambassador to Lithuania (1992–1996), and Member to the Sejm (2007–2011).
Jan Widacki is one of the pioneer in the field of experimental research in polygraph examinations in Poland, and one of the pioneers in the field of performing such examinations for purposes of criminal proceedings. His groundbreaking 1978 collaboration with Frank Horvath, "An Experimental Investigation of the Relative Validity and Utility of the Polygraph Technique and Three Other Common Methods of Criminal Identification," published in the Journal of Forensic Sciences, became a foundational study in the field. Widacki's research spans multiple domains: he has conducted extensive work on historical foundations of polygraph examination, having authored comprehensive histories of the field that trace development from ancient lie detection methods to modern psychophysiological testing. His recent work explores emerging technologies, including experiments with infrared cameras to detect facial temperature changes as deception indicators and facial expression analysis using FaceReader software. He has also contributed significantly to understanding the legal framework for polygraph use in Poland and conducted important studies on the diagnostic value of polygraph examinations and the galvanic skin response (GSR) as a deception indicator.
Widacki has achieved exceptional standing in the international polygraph community. Jan Widacki, European Editor Email: [email protected] European Polygraph is an international journal devoted to the publication of original investigations, observations, scholarly inquiries, and book reviews on the subject of polygraph examinations. He is a member of: American Polygraph Association, The British and European Polygraph Association, International Society of Polygraph Examiners, Ukrainian Polygraph Association (honorary member), Euroasiatic Polygraph Association (honorary member). His 28 studies in the database reflect a highly productive collaborative research program, frequently working with a team that includes his son Michał Widacki, as well as Anna Szuba-Boroń, Bartosz Wójcik, and others. His 2017 book Historia badań poligraficznych (History of Polygraph Examinations) has been recognized as the first comprehensive historical treatment of the field and has been translated into Ukrainian for international dissemination.
Widacki's work bridges multiple disciplines, integrating law, criminology, forensic science, psychology, and psychophysiology. His interdisciplinary approach is evident in his historical research on figures like Major Ludwik Krzewiński (creator of Polish narcoanalysis) and John Augustus Larson, his legal analyses of polygraph admissibility in criminal proceedings, and his experimental investigations of new detection technologies. This breadth reflects his broader academic contributions beyond polygraph research, including work in criminology, forensic medicine history, and criminal justice policy. His unique combination of practical experience (as a government minister and diplomat), academic expertise, and editorial leadership has made him a central figure in European polygraph science for over four decades.
Research methodology profile
Research areas
Co-author network
Researchers who have co-authored studies with Jan Stefan Widacki.
Publications [38]
All peer-reviewed studies by Jan Stefan Widacki in our database.
Recognition of emotions by analysing facial expressions with FaceReader (Noldus) vs detection of deception by polygraph examination: A pilot study
The study explored the integration of facial expression analysis technology with traditional polygraph examination to identify emotions accompanying deceptive responses during concealed information testing. [002] 2024 European PolygraphA Handful of Remarks on the Terminology Reference for the Science of Psychophysiological Detection of Deception
The polygraph field has struggled with inconsistent terminology since its inception, with devices operating under various names including 'cardio-pneumo psychogram,' 'Berkeley psychograph,' and colloquially 'lie detector.' [003] 2022 Naukovij vìsnik Nacìonalʹnoï akademìï vnutrìšnìh spravTheoretical and applied principles of the phenomenon of counteracting psychophysiological research by using a polygraph
[004] 2022 European PolygraphWhat Do Polygraphers–Practitioners Expect from Science?
Polygraph practitioners demonstrated a strong preference for familiar techniques over scientific innovations, with minimal interest expressed in neurophysiological detection methods (EEG, fMRI) or remote sensing technologies that differ from traditional… [005] 2022 European PolygraphAttempt at Detection of Deception Based on Records of Physiological Reactions Remotely Captured with FaceReader Software: Part 1
The study represents a pioneering attempt to validate automated facial expression analysis for deception detection, though specific diagnostic performance results are not provided in this excerpt from Part 1 of… [006] 2021 European PolygraphAleksandr Motlyach: Poligrafologia (Polygraphy) , Izdatelstvo Osvita Ukrainy, Kyiv 2021, pp. 568 (in Russian)
The textbook provides comprehensive Russian-language coverage of polygraph theory and practice tailored to Ukrainian legal and professional contexts, supporting the rapid development of polygraph capabilities in Ukraine since the late… [007] 2021 European PolygraphThe Use of Narcoanalysis by Polish Counterintelligence in the 1930s
Polish military intelligence routinely used narcoanalysis for counterintelligence interrogations in the 1930s, making it among the first systematic governmental applications of drug-induced interrogation worldwide. [008] 2020 European PolygraphMagdalena Kasprzak: Badania wariograficzne w polskim systemie prawnym (literally: “Polygraph examination in the Polish legal system”), Instytut Wydawniczy EuroPrawo, Warszawa 2020
[009] 2020 European PolygraphJohn Augustus Larson (1892–1965)
Larson became likely the first American policeman with a doctoral degree and created the foundational technology that launched a new era of scientific criminal investigation in Berkeley, California in 1920. [010] 2020 European PolygraphA Half-Century of Experiences with the Polygraph
The essay chronicles the ideological shift from polygraph rejection to scientific acceptance in Eastern Europe, documents persistent challenges including inadequate legal knowledge and insufficient quality control in Polish practice, and… [011] 2019 European PolygraphVerbal and Non-verbal Symptoms of Deception in the Eyes of Policemen and Psychologists
The study reveals differences between police officers' and psychologists' beliefs about behavioral deception indicators, highlighting discrepancies between professional confidence and scientific evidence regarding deception detection accuracy. [012] 2019 European PolygraphAttempts at Lie Detection Based on Scientific Premises on the End of 19th Century and in the First Half of the 20th Century
Early researchers achieved notable results including Benussi's reported 97.5% accuracy using respiratory I/E ratios, Jung's successful forensic application of word association tests, and Luria's combined measurement of reaction time and… [013] 2019 European PolygraphFirst Attempts at Practical Use of Instrumental Lie Detection
Instrumental lie detection moved from first operational use in 1917 investigations to routine deployment in 15 federal agencies by the post-WWII era, with significant wartime applications including Manhattan Project security… [014] 2018 European PolygraphExperiments in Using Face Temperature Changes as an Indicator in Instrumental Detection of Deception
Areas near the nose showed full consistency with GSR recordings, with smaller, anatomically focused regions producing clearer thermal signatures than larger facial areas. The study demonstrated feasibility while identifying needs… [015] 2018 European PolygraphPolygraph Examination in Poland: History, Law, Experimental Research, and Practice
Poland developed one of Europe's most established polygraph traditions with systematic criminal justice use since 1963 and explicit legal authorization since 2003, but utilization remains minimal (approximately 1 in 6,000… [016] 2017 European PolygraphPolygraph Examinations of Civil Servants in Poland
The paper reviews Polish legislation authorizing polygraph use in security agencies including the Internal Security Agency, Central Anticorruption Bureau, and military intelligence services. [017] 2017Historia badań poligraficznych
The work documents that polygraph development was an international scientific enterprise built on decades of physiological and psychological research, identifying previously unrecognized contributors including Polish researchers Cybulski, Beck, and Tarchanoff,… [018] 2016 European PolygraphA.Y. Molchanov, N.A. Molchanova: Atlas Poligramm (in Russian; literally: “Atlas of Polygraph Records”), IPK, Jaroslav, Russia 2007, pp. 384
The atlas provides extensive visual training materials organized by physiological channel, with over 300 real-world chart examples from Russian polygraph practice, including a dedicated section on deliberately corrupted responses. [019] 2016 European PolygraphPreparation to Experimental Testing of the Potential from Using Facial Temperature Changes Registered with an Infrared Camera in Lie Detection
The study successfully established the theoretical framework for using infrared cameras to measure facial temperature fluctuations during deception detection, identifying methods to convert thermal images into graphic charts comparable to… [020] 2016 European PolygraphThe First Polygraph?
The term 'polygraph' was used by Napoleon Cybulski in 1895 and Leon Zbyszewski in 1914 to describe multi-channel physiological recording devices, predating Mackenzie's 1908 ink polygraph. Mackenzie did not invent… [021] 2016 Issues of Forensic SciencePolygraph or Variograph?
The term 'polygraph' is historically and scientifically appropriate, with nearly 200 years of usage in physiological and medical literature; the proposed alternative 'variograph' lacks justification and would isolate Polish practice… [022] 2015 Journal of the History of the NeurosciencesIvane Tarkhnishvili (Ivan Tarchanoff) and His Links With Poland
Tarchanoff died in Nawojowa Góra, Poland on August 24, 1908, not in Saint Petersburg as previously reported. After dismissal from the St. Petersburg Academy in 1895, he relocated to Galicia,… [023] 2015 Problemy kryminalistykiLie detection – of what?
Polygraph testing does not directly detect lies but rather measures physiological responses associated with emotions, cognitive effort, and recognition of significant stimuli. The concept of 'lying' varies substantially across philosophical,… [024] 2015 European PolygraphThermal Vision as a Method of Detection of Deception: A Review of Experiences
The periorbital and nasal regions showed the highest temperature fluctuations associated with deception, with studies reporting 73.3% accuracy for thermal imaging alone and improved results when combined with traditional polygraph… [025] 2015 European PolygraphDiscoverers of the Galvanic Skin Response
Féré and Tarchanoff independently discovered that skin electrical properties change with emotional and psychological states, using exosomatic and endosomatic methods respectively, establishing GSR as what remains one of the most… [026] 2014 European PolygraphResults of Polygraph Examinations: Direct or Circumstantial Evidence?
Polygraph results are classified as circumstantial evidence requiring logical inference rather than direct evidence, which helps explain judicial resistance to their admission in court proceedings. [027] 2013 European PolygraphHistory of Polygraph Examinations in Poland
The study reveals that the term 'polygraph' was already in use in Polish physiological literature in the 19th century, and Poland's unique position during the Cold War led to divergent… [028] 2013Współczesne standardy badań poligraficznych
The manual documents validated polygraph techniques with specific accuracy metrics (CIT showing 82.3% accuracy, 81.5% sensitivity, 83.2% specificity), establishes quality control procedures modeled on U.S. practices, and provides standardized protocols… [029] 2012 European PolygraphThe European Roots of Instrumental Lie Detection
European researchers including Mosso, Lombroso, and Benussi developed the fundamental physiological measurement instruments and theoretical understanding of emotion-related physiological changes that preceded and enabled American polygraph development. [030] 2012 European PolygraphPolygraph Examination in Criminal Cases. Current Polish Practice. A Critical Study
Polygraph examinations were performed in just one in over 6,000 Polish criminal cases during 2002–2012, with no professional quality control and many examinations conducted incorrectly by unqualified examiners, while lawyers'… [031] 2009 European PolygraphWhen should the Polygraph Stimulation Number Test be Performed?
In 63% of deceptive subjects, reactions to critical questions were greater in the control question test administered after the stimulation test compared to before, challenging assumptions that stimulation testing reduces… [032] 2008 European PolygraphIs the Lie Detector an American Obsession?
The work addresses American exceptionalism in lie detection technology and provides counterpoints to Alder's historical interpretations of polygraph development and adoption in the United States. [033] 1994 PolygraphThe current status of research in forensic psychophysiology and its application in the psychophysiological detection of deception
The computerization of polygraph represented the most significant technological advance, with research directed toward new sensors, digitized data collection, automated diagnostic algorithms, and countermeasure detection methods that would fundamentally transform… [034] 1982Analiza przesłanek diagnozowania w badaniach poligraficznych
The monograph articulated the theoretical constructs and diagnostic premises that enable polygraph testing to achieve validity as a forensic tool, clarifying the logical structure of inferences from physiological arousal to… [035] 1981Wprowadzenie do problematyki badań poligraficznych
The work systematically documented polygraph theory, methodology, and practice as of 1981, establishing methodological standards based primarily on Reid techniques and emerging numerical scoring systems, while addressing approximately 300 serious… [036] 1981Introducing to the Polygraph Examinations
[037] 1978 Journal of Forensic SciencesAn Experimental Investigation of the Relative Validity and Utility of the Polygraph Technique and Three Other Common Methods of Criminal Identification
Polygraph testing achieved the highest accuracy with 18 of 20 correct decisions (90%), 1 incorrect decision (5%), and 1 inconclusive (5%), outperforming eyewitness identification, fingerprints, and handwriting analysis under comparable… [038] 1977Wartość diagnostyczna badania poligraficznego i jej znaczenie kryminalistyczne
Polygraph examination produced 18 correct identifications out of 20 cases (90% accuracy rate), tied with graphological analysis for the fewest incorrect diagnoses and achieving the highest performance among all four…Explore all research.
Browse our complete database of 3493 peer-reviewed polygraph studies.