Chicago: Where Polygraph Becomes a Science

This historical analysis examines Chicago's pivotal role in transforming polygraph from an experimental concept into a systematic scientific discipline during the early-to-mid 20th century. The study traces the evolution from Marston's early blood pressure tests through the development of more sophisticated techniques by key figures like Keeler, Larson, and Reid.

The study employs historical documentary analysis, synthesizing archival records, court documents, institutional histories, and biographical materials to trace polygraph development in Chicago from the 1920s through 1940s.

This historical study examines how Chicago became the birthplace of modern polygraph science through institutional convergence during the early-to-mid 20th century. Using documentary analysis of archival materials, the authors traced the development from Marston's early blood pressure tests through the establishment of the Chicago Crime Lab following the St. Valentine's Day Massacre. Key developments included Fred Inbau assigning John Reid to address high error rates in Relevant/Irrelevant questioning, leading to the Comparison Question Technique, and the contributions of Keeler and Larson in refining instruments and procedures. The analysis reveals that systematic scientific advancement resulted from the intersection of Northwestern Law School, the Institute for Juvenile Research, and the Chicago Police Department's Crime Lab rather than individual innovations alone.

This research provides critical historical context for understanding modern polygraph practice and demonstrates the importance of institutional infrastructure in advancing forensic science methodologies. The documented evolution from experimental techniques to systematic practice offers insights for contemporary efforts to improve polygraph validity and reliability.

Background & Context

This historical analysis examines Chicago's pivotal role in transforming polygraph from an experimental concept into a systematic scientific discipline during the early-to-mid 20th century. The Chicago Crime Lab, founded following the St. Valentine's Day Massacre, advanced forensic science including polygraph. The paper traces the evolution from Marston's Systolic Blood Pressure test that claimed 94%-96% accuracy in detecting deception through the development of more sophisticated techniques.

The article fills a critical gap by documenting how Chicago became the epicenter for polygraph innovation through the convergence of academic institutions, progressive criminal justice reforms, and pioneering practitioners. Fred Inbau was appointed Director and assigned a young lawyer, John Reid, to look into the high error rate of specific issue polygraph examinations using the Relevant/Irrelevant questioning technique. This institutional support created the conditions for systematic methodological advancement.

Research Design & Methodology

This work employs historical documentary analysis rather than experimental research. The authors synthesized archival records, court documents, institutional histories, and biographical materials to trace the development of polygraph science in Chicago from the 1920s through the 1940s. The paper draws extensively on primary sources including legal records from the Frye v. U.S. decision from 12/3/1923 and institutional documents.

The analysis focuses on several key figures and institutions:

• Keeler and Larson who refined polygraph techniques and instruments in Chicago's early 20th-century context
• Larson who began conducting between 100 and 150 polygraph examinations of inmates per month and advising the Parole Board
• John Reid's development of the Comparison Question Technique to address methodological limitations
• The role of Northwestern Law School and the Institute for Juvenile Research

The methodology traces institutional relationships, technological innovations, and the evolution of testing protocols that collectively established Chicago as the birthplace of modern polygraph practice.

Results & Key Findings

Chicago's unique ecosystem of academic, legal, and law enforcement institutions created the conditions for polygraph to evolve from experimental technique to systematic practice. The historical analysis reveals several critical developments that distinguished Chicago's contributions.

Key historical findings include:

• The Chicago Police Department purchased the Crime Lab for $25,000, where Fred Inbau assigned John Reid to investigate the high error rate of Relevant/Irrelevant questioning
• Keeler trained Charlie's wife, Jane, to become the first female polygraph examiner
• In 1942, Keeler created the first Mobile Crime Lab, and in 1944, Army CID used Keeler to polygraph German POWs
• Present day Post-conviction Sex Offender Testing was preceded by Larson's efforts though no one has reviewed his procedures or results

The paper documents how Keeler obtained credit for both instrumental and procedural innovations that were actually developed by others, while he was supposed to focus on improving the polygraph instrument and Larson on improving procedures and conducting research on validity and reliability.

Discussion & Significance

The analysis demonstrates that Chicago's transformation of polygraph into a scientific discipline resulted from institutional convergence rather than individual genius alone. The intersection of Northwestern Law School's criminology program, the Institute for Juvenile Research, and the Chicago Police Department's Scientific Crime Lab created an unprecedented infrastructure for systematic development and validation.

Dean Wigmore's response to the 1922 Frye decision—"If there is ever devised a psychological test for the valuation of witnesses, the law will run to meet it"—reflected the legal community's openness to scientific evidence, even as courts remained skeptical. The Frye standard, established through polygraph litigation, would govern scientific evidence admissibility until the Daubert decision 70 years later, demonstrating polygraph's profound impact on legal doctrine beyond deception detection itself.

The paper reveals tensions between scientific rigor and practical application that continue to characterize the field. The difficulty in identifying who created the original Relevant/Irrelevant technique, whether it was Marston before Frye's 1922 test or Larson using a similar technique with a searching Peak of Tension test, illustrates how collaborative development often obscures individual contributions in scientific advancement.

Limitations & Considerations

As a historical analysis, this work relies on documentary evidence that may reflect incomplete or biased records. Frank Horvath later clarified that he did not co-author this article nor did he review it or have any involvement in its preparation, raising questions about the publication's editorial process. The paper acknowledges that Keeler was "somewhat of a polygraph kleptomaniac, obtaining credit for both instrumental and procedural innovations that were actually developed by others," suggesting that historical attribution requires careful scrutiny.

The analysis does not provide quantitative assessment of technique effectiveness during this period, focusing instead on institutional history and biographical narrative. While the paper notes present day Post-conviction Sex Offender Testing appears to have been preceded by Larson's efforts though no one has apparently reviewed his procedures or results, this represents a significant gap in understanding early validation efforts.

Practical Applications

This historical analysis provides essential context for understanding modern polygraph practice. Practitioners benefit from recognizing that foundational techniques emerged from systematic institutional problem-solving rather than individual inspiration. The Chicago model—combining academic research, law enforcement application, and legal oversight—remains relevant for contemporary polygraph program development.

The paper's documentation of early quality control efforts, including Reid's investigation into the high error rate of specific issue polygraph examinations using the Relevant/Irrelevant questioning technique, demonstrates that methodological refinement through systematic evaluation has always been central to professional polygraph practice. Understanding this history helps examiners appreciate why standardized protocols and ongoing validation research remain critical to the field's credibility and effectiveness.