The analysis of nonverbal communication: the dangers of pseudoscience in security and justice contexts

This 2020 position paper by over 50 international experts critically examines three widely-used nonverbal behavior analysis programs (SPOT, BAI, and synergology) in security and justice contexts. The study finds that all three approaches lack scientific support and potentially cause serious harm despite widespread operational deployment.

Critical review and conceptual analysis synthesizing decades of peer-reviewed research on nonverbal communication, systematically evaluating operational programs against established scientific evidence through consensus statement methodology.

An unprecedented coalition of over 50 international deception detection experts conducted a comprehensive critique of pseudoscientific nonverbal behavior analysis methods used in high-stakes security and justice contexts. The study systematically evaluated SPOT, BAI, and synergology programs against established scientific evidence, finding that none have empirical support despite widespread deployment. Meta-analyses of over 400 studies show human deception detection accuracy remains at chance levels, yet programs like SPOT have cost taxpayers over $900 million since 2007. The paper represents the most comprehensive scholarly challenge to operational deception detection practices, highlighting the dangerous gap between scientific evidence and real-world applications where individual liberty is at stake.

The findings challenge the widespread use of unvalidated behavioral deception detection methods in security screening and criminal justice, calling for evidence-based approaches and highlighting the need for stricter scientific standards before operational deployment of such techniques.

Background & Context

The intersection of nonverbal behavior analysis and security/justice applications represents a critical challenge in modern law enforcement and legal practice. While thousands of peer-reviewed articles on nonverbal communication represent important sources of knowledge for security and justice professionals, a troubling gap persists between scientific evidence and operational practice. This 2020 position paper, authored by an unprecedented coalition of over 50 international experts in deception detection, forensic psychology, and nonverbal communication, addresses this dangerous divide.

The study emerges from growing concerns about pseudoscientific methods infiltrating high-stakes decision-making contexts where individual liberty hangs in the balance. The article examines concepts of nonverbal communication conveyed by various programs, methods, and approaches, but also the consequences of their use on the life or liberty of individuals. This represents one of the most comprehensive critiques of operational deception detection practices ever assembled, bringing together leading scholars from multiple continents to confront the proliferation of unvalidated techniques.

The paper directly challenges three widely-deployed approaches: SPOT (Screening of Passengers by Observation Techniques), the BAI (Behavior Analysis Interview) and synergology. Each of these methods claims to enable reliable deception detection through nonverbal behavior analysis, yet each contradicts established scientific evidence about the actual diagnostic value of behavioral cues.

Research Design & Methodology

This study employs a critical review and conceptual analysis methodology rather than empirical data collection. The authors describe the scope of scientific research on nonverbal communication by synthesizing decades of peer-reviewed findings, then systematically evaluate three prominent operational programs against this scientific foundation. The approach represents a consensus statement from the international deception detection research community.

The analysis framework examines each program across multiple dimensions:

• Scientific validity of core assumptions about behavior-deception relationships
• Evidence base supporting claimed effectiveness rates
• Real-world consequences and costs of implementation
• Alignment with established research on human nonverbal communication

For each program examined, the authors reviewed government reports, internal validation studies, independent assessments, and the broader scientific literature on nonverbal deception cues. For SPOT specifically, they note that TSA deployed the program nationwide without first validating the scientific basis, and that a scientific consensus does not exist on whether behavior detection principles can be reliably used for counterterrorism purposes. The methodology prioritizes external scientific evidence over proponent claims and promotional materials.

Results & Key Findings

The central finding is unequivocal: all three examined approaches lack scientific support and potentially cause serious harm. Available evidence does not support whether behavioral indicators used in SPOT can identify persons who pose risks to aviation security, with meta-analyses of over 400 studies finding that human ability to accurately identify deceptive behavior is the same as or slightly better than chance.

Specific findings for each program reveal systemic problems:

• SPOT Program: Cost taxpayers more than $220 million per year, yet GAO recommended Congress consider the lack of scientific evidence when making funding decisions. The program's effectiveness remained unproven despite spending about $900 million since fiscal year 2007.
• Behavior Analysis Interview (BAI): An ineffective screen for innocence, with investigators performing only slightly better than chance when applying verbal and nonverbal cues to distinguish lying from truth-telling.
• Synergology: Claims specific to synergology are not published in peer-reviewed papers, with the founder stating that 'a synergologist has no peer' – meaning nobody but a synergologist can criticise synergology.

BDOs' referral rates under SPOT varied significantly across airports, raising questions about the consistent use of behavioral indicators. This variability suggests the indicators themselves lack reliability, a fundamental requirement for any diagnostic tool.

Discussion & Significance

The paper's significance lies not just in debunking specific programs, but in explaining why pseudoscience persists in security contexts. The authors offer five hypotheses: organizations face problems these programs claim to solve; the importance and urgency of securing airports could explain SPOT implementation; the desire to implement better professional practices could explain BAI adoption. Additional factors include the superficial appearance of scientific legitimacy, organizational resistance to admitting prior mistakes, and economic incentives for program vendors.

The consequences extend beyond wasted resources. In Quebec courts, if judges use synergology concepts having no more scientific basis than medieval ordeals, trial outcomes could be distorted when evidence is limited to contradictory testimonies; witnesses who tell the truth could be considered dishonest, and vice-versa. This represents a fundamental threat to justice system integrity.

The authors emphasize that rejecting pseudoscience doesn't mean abandoning behavioral analysis entirely. Instead, they invite organizations to work with the international community of scholars who have scientific expertise in nonverbal communication and lie detection to implement evidence-based practices. The gap between research and practice remains bridgeable, but only through genuine engagement with scientific methodology.

Limitations & Considerations

While the paper provides authoritative scientific consensus, several considerations merit attention. The analysis focuses on three specific programs and may not comprehensively address all problematic approaches in use. The authors acknowledge that their critique applies to current implementations and that future methodological improvements could potentially change these assessments if supported by rigorous validation research.

The paper is primarily conceptual and critical rather than presenting new empirical data. Its strength lies in synthesizing existing evidence and expert consensus, but readers seeking detailed statistical analyses of specific program performance must consult the individual validation studies referenced. Additionally, the focus on Western security contexts may not fully capture international variations in nonverbal communication practices and cultural differences in behavior patterns.

Practical Applications

For polygraph professionals and the broader deception detection community, this paper delivers crucial lessons. The systematic failure of SPOT, BAI, and synergology demonstrates that superficial behavioral indicators cannot reliably detect deception, regardless of training intensity or practitioner confidence. Polygraph examiners should recognize that their own behavioral observations during pre-test and post-test phases face the same fundamental limitations identified in this research.

The paper advocates for evidence-based alternatives: investing resources in methods with demonstrated validity, prioritizing comprehensive investigations over behavioral shortcuts, implementing rigorous validation requirements before deploying new techniques, and maintaining skepticism toward approaches that promise certainty in detecting deception. Organizations currently using or considering behavioral screening programs should demand peer-reviewed validation evidence and independent replication studies before committing resources or allowing such methods to influence consequential decisions about individuals.