Voice Stress Analysis as an Investigative Tool in War Crime Investigations: Application to Victim, Witness, Source, and Subject Interviews

by Lawrence Rice, VSA Instructor, VIPRE Technology Group, LLC

https://www.linkedin.com/in/lkr3515/

August 1, 2026

Abstract

Voice stress analysis (VSA) is an investigative interviewing tool designed to assist examiners in identifying stress patterns that may be associated with deception, uncertainty, concealment, or emotionally significant information during structured interviews. In war crime investigations, where investigators must assess witnesses, sources, victims, insiders, and suspects under complex conditions, VSA may serve a valuable role when used as part of a broader truth-seeking process. Like the polygraph, VSA should not be treated as a substitute for evidence, but it can assist investigators in developing leads, testing statements, identifying areas requiring clarification, and encouraging truthful disclosure. This paper argues that VSA can be used effectively in war crime investigations when it is administered by trained examiners, supported by proper question formulation, integrated with rapport-based interviewing, and corroborated through independent evidence. A comparative VSA-polygraph study reported full agreement between the two methods in 54 final paired examinations, supporting the position that computerized VSA can perform comparably to polygraph when both are used under controlled investigative conditions. In war crime investigations, VSA's practical value lies not in replacing traditional evidence, but in helping investigators more efficiently ferret out the truth during victim, witness, source, and subject interviews.

Keywords: voice stress analysis, VIPRE, CVSA, polygraph, war crimes, investigative interviewing, truth verification, stress detection, credibility assessment

Criminalistic Support and the Role of VSA in War Crime Investigations

War crime investigations require more than ordinary witness questioning. They require organized criminalistic support, properly structured investigative actions, and methods that help investigators document complex events, identify participants, and corroborate information. Levytskyi and Moskaliuk (2024) emphasize the importance of developing the scientific and theoretical foundations for criminalistic support in war crime investigations. That framework supports the use of specialized investigative tools, including interview-support technologies, when those tools are used to guide questioning, develop leads, and strengthen corroboration rather than replace traditional evidence.

Within that broader investigative framework, VSA may serve a practical role similar to the polygraph by helping investigators identify areas of stress, concealment, or possible deception during victim, witness, source, and subject interviews.

Voice Stress Analysis as an Investigative Tool

War crime investigations are among the most difficult forms of criminal investigation. They often involve large numbers of victims, scattered witnesses, destroyed records, traumatized communities, propaganda, command structures, and suspects who may deny responsibility or minimize their role. Investigators must determine what happened, who was involved, who gave orders, who carried them out, and what evidence can corroborate those facts. In this environment, interviews remain central. Witnesses, victims, insider sources, military personnel, detainees, and suspected perpetrators may all possess critical information.

VSA offers a practical tool for assisting investigators during those interviews. VSA is designed to evaluate changes in a person's voice that may indicate stress associated with deception, concealment, or emotionally significant information. A National Institute of Justice report by Haddad et al. (2002) is useful for describing VSA as a technology that evaluates voice stress and related vocal features in communications. In this paper, Haddad et al. are used for that technology background, not as a claim that VSA results alone prove deception.

Although VSA should not be used as the sole basis for legal conclusions, it can help investigators focus questioning, identify areas requiring follow-up, and encourage truthful disclosures. In this respect, VSA serves a role similar to the polygraph: it is an investigative aid, not a replacement for professional judgment or corroborating evidence.

Modern computerized systems such as the VIPRE Voice Analyzer provide a practical platform for conducting structured voice stress analysis examinations. Rather than functioning as an automated lie detector, the VIPRE system assists the trained examiner in collecting, analyzing, and documenting voice stress responses during carefully prepared examinations. Its digital recording capabilities, structured testing protocols, and examiner-directed analytical process make it well suited for complex investigations where interviews must be systematically documented and integrated with other investigative evidence. In war crime investigations, these characteristics support disciplined evaluation while reinforcing that examination results are investigative leads requiring independent corroboration.

The central argument of this paper is that VSA can be useful in war crime investigations when used properly in the investigative process. Its value is strongest when applied carefully in victim, witness, source, and subject interviews. In each setting, VSA can help investigators identify inconsistencies, develop leads, and move an interview toward greater truthfulness.

Stress Detection, Not Lie Detection

To properly understand the usefulness of VSA in the investigative process, it is important to clarify what VSA does and what it does not do. The polygraph provides a useful comparison because both technologies are commonly associated with truth verification, and both have often been described, sometimes carelessly, as "lie detectors." That label is misleading. No instrument detects lies directly. VSA and polygraph systems detect physiological manifestations of stress that may occur when a person is confronted with a meaningful, threatening, or jeopardy-based question. This distinction is not merely semantic; it is fundamental to understanding the proper investigative use of VSA.

VSA focuses on stress-related changes in speech production. Rather than attaching sensors to the body, as with the polygraph, VSA analyzes vocal responses produced during questioning. The polygraph records physiological activity such as respiration, electrodermal response, and cardiovascular activity. Although the two systems collect different forms of physiological information, the investigative premise is similar: when an interviewee is asked a relevant question that carries personal risk, significance, or jeopardy, the body may produce measurable stress responses. For the VSA examiner, those vocal stress responses may identify areas requiring further questioning, clarification, or corroboration.

That does not mean stress is the same as deception. A truthful person may experience anxiety, embarrassment, anger, trauma, confusion, or fear of not being believed. A deceptive person may remain calm, rehearsed, or emotionally controlled. For that reason, VSA should not be presented as an independent determination of motive, intent, guilt, or truthfulness. The same limitation applies to the polygraph. The instrument records physiological data; the trained examiner interprets that data within the structure of the interview, the wording of the questions, the interviewee’s behavior, and the facts already known in the investigation.

The scientific literature has long recognized this limitation in the polygraph field, and the same principle applies when explaining VSA. The National Research Council (2003) concluded that polygraph testing measures physiological responses associated with arousal rather than deception itself. Lykken (1998) similarly argued that polygraph outcomes often reflect fear of detection rather than the act of lying alone. Vrij (2008) explained that no single physiological marker uniquely identifies deception because stress, cognitive load, and emotional arousal may appear in both truthful and deceptive individuals. These observations help explain why VSA should be understood as a stress-analysis and investigative-support tool, not as a mechanical lie detector.

This limitation does not weaken the practical value of VSA. It defines its proper role. Properly administered, VSA may identify stress patterns that correlate with deception, concealment, or emotionally significant information under structured interview conditions. Like the polygraph, it does not detect lies on its own. Its value is investigative: it helps the examiner focus questioning, test explanations, seek admissions, evaluate areas of concern, and identify where independent corroboration is needed. In war crime investigations, VSA is useful not as a substitute for evidence, but as a disciplined interview tool that can help investigators move closer to the truth.

Relationship Between VSA and Polygraph

Because the polygraph is the more familiar truth-verification instrument, it provides a useful reference point for understanding VSA. Both systems are used in investigative settings to identify stress responses to relevant questions, but they collect that information through different channels. The polygraph records physiological activity through attached sensors, while VSA evaluates stress-related changes in the voice. The American Polygraph Association (2011) reported criterion-accuracy findings for validated polygraph techniques, while the National Research Council (2003) emphasized that polygraph results must be interpreted cautiously and should not replace evidence, corroboration, or investigator judgment. That same principle applies to VSA.

VSA should therefore be understood as occupying a similar investigative role to the polygraph, while offering a less physically intrusive method of evaluating stress responses during questioning. Its value lies in helping the examiner identify issues that may require clarification, further questioning, or corroboration. This comparison is important because the available VSA-polygraph comparison literature evaluates VSA not as a courtroom substitute for evidence, but as an investigative instrument used under structured examination conditions.

A comparative study by Tippett (1994) addressed whether Voice Stress Analysis was as reliable as the polygraph. The study used 60 male sex offenders in treatment and probationary monitoring. The design attempted to make the comparison fair by using both instruments in the same examination setting, asking the same relevant questions, and having different evaluators independently score the VSA and polygraph results. The final comparison excluded the first four cases, in which examinees reviewed their VSA results, changed their answers before the polygraph examination, and then produced no deception indicated results on the polygraph. Two additional cases were also excluded because the examinees could not medically meet the required conditions for completing the polygraph examination. As a result, the final comparative analysis was based on 54 paired VSA-polygraph examinations. Among those 54 examinations, Tippett reported 100% agreement between VSA and polygraph results: 35 deception indicated results and 19 no deception indicated results.

The importance of the Tippett study is not that it proves VSA is perfect. Rather, its value is that it demonstrates how VSA can function comparably to the polygraph when the testing environment is structured, the questions are relevant, the examiner is trained, and the results are used as investigative information. That is directly relevant to war crime investigations, where the goal is often not immediate courtroom admission of the instrument result, but the development of truthful information.

VSA in Victim and Witness Interviews

Victim and witness interviews in war crime investigations often involve people who experienced or observed killings, torture, forced displacement, sexual violence, unlawful detention, looting, destruction of civilian property, or command activity. Some victims and witnesses may be reluctant to speak because of fear, shame, trauma, loyalty, community pressure, or concern for family members. Others may provide incomplete accounts because they are protecting themselves, protecting others, avoiding retaliation, or struggling to recall events that occurred under extreme stress.

VSA can assist investigators by identifying areas of stress during victim and witness interviews. For example, a victim or witness may provide a generally truthful account but omit the identity of a commander, the location of a grave site, the involvement of a family member, the presence of additional perpetrators, or the witness's own role in events. A VSA-assisted interview may help the investigator recognize which topic requires additional questioning. The tool does not replace rapport, patience, trauma-informed interviewing, or corroboration, but it may provide useful direction when used carefully.

Victim interviews require particular caution. A victim of torture, sexual violence, unlawful detention, forced displacement, or battlefield violence may show stress for reasons entirely unrelated to deception. The interview itself may trigger fear, shame, memory fragmentation, or emotional distress. For that reason, VSA should never be used to accuse a victim of lying or to pressure a victim into providing details before he or she is ready. Instead, when VSA is used in victim interviews, it should function as a quiet investigative aid that helps the examiner identify areas that may need clarification, follow-up, or corroboration.

In victim and witness interviews, the examiner should explain the process, obtain consent, and avoid accusatory language. Many victims and witnesses in war crime cases are traumatized. The Istanbul Protocol emphasizes careful documentation and safeguards when dealing with allegations of torture or ill-treatment, and that same protective approach is useful when interviewing vulnerable war-crime victims and witnesses (Office of the United Nations High Commissioner for Human Rights [OHCHR], 2022). The United Nations manual on investigative interviewing likewise supports structured, non-coercive interviewing aimed at obtaining accurate and reliable information (United Nations Department of Peace Operations et al., 2024).

For that reason, stress should not automatically be equated with deception. Stress may arise from fear, memory, trauma, confusion, cultural concerns, language barriers, or the interview setting itself. Therefore, VSA results should be treated as a guide for follow-up questioning, not as a credibility label. Properly used, VSA can help investigators ask better questions, identify areas needing corroboration, and preserve the dignity of the victim or witness.

VSA in Source Interviews

Source interviews are especially important in war crime investigations. Sources may include insiders, former combatants, intelligence contacts, local officials, humanitarian workers, interpreters, defectors, or people with access to military or political networks. These individuals may provide valuable information, but they may also have mixed motives. A source may seek money, protection, revenge, immigration benefits, political advantage, or immunity.

VSA may be particularly useful in source validation. Investigators must determine whether a source is truthful, exaggerating, withholding, or manipulating information. A structured VSA interview can focus on key source-validation questions: whether the source personally observed the event, whether the source is concealing contact with a suspect group, whether the source has been directed to provide false information, whether the source has received payment, or whether the source is withholding evidence. The United Nations Department of Peace Operations, OHCHR, and United Nations Office on Drugs and Crime (2024) emphasize that effective investigative interviewing should be planned, lawful, non-coercive, and directed toward reliable information; a properly framed VSA interview can fit within that model when it is used to structure inquiry rather than intimidate the source.

In this role, VSA can function similarly to polygraph screening in intelligence and law enforcement contexts. The purpose is not to convict anyone based on the result. The purpose is to evaluate reliability, identify risk areas, and decide what information requires corroboration. If a source shows significant stress on questions involving contact with a military unit or participation in an atrocity, investigators may use that response to conduct further interviews, seek documents, compare timelines, or review communications evidence.

VSA in Subject and Suspect Interviews

Subject interviews involve individuals suspected of participating in, ordering, assisting, or concealing war crimes. These interviews may include soldiers, commanders, prison guards, militia members, police officers, political officials, logistics personnel, or civilian collaborators. Subjects may deny involvement, minimize their role, blame others, or claim they were following orders.

VSA can assist subject interviews by focusing the examination on carefully prepared relevant questions. These questions may address presence at a crime scene, participation in a specific operation, knowledge of unlawful orders, involvement in detention or transfer of prisoners, concealment of bodies, destruction of records, or command responsibility. When stress responses appear in relation to particular topics, the examiner can return to those areas during the post-test interview.

VSA may be especially useful in subject and suspect interviews because those interviews often involve direct questions about presence, participation, knowledge, command responsibility, or concealment. Like the polygraph, VSA can create a structured truth-verification setting. The subject understands that the examiner is focusing on specific issues and evaluating stress responses associated with those issues. This can increase the psychological pressure to disclose the truth. In many investigations, the most valuable result of a VSA or polygraph examination is not the chart itself, but the admissions, clarifications, and investigative leads that follow.

The Tippett (1994) study illustrates this point. The first four examinees were shown their VSA results, changed their answers before the polygraph examination, and then produced no deception–indicated results on the polygraph. This suggests that VSA feedback can prompt examinees to correct deceptive or incomplete answers. In an investigative setting, that effect is significant. If VSA helps produce truthful admissions or more accurate statements, it has practical investigative value.

Advantages of VSA in War Crime Investigations

The VIPRE Voice Analyzer exemplifies how contemporary voice stress analysis technology can be integrated into demanding investigative environments. The system supports structured examinations through digital voice acquisition, standardized question sequencing, and examiner-directed analysis rather than automated decision-making. Its portability, modest equipment requirements, and electronic documentation capabilities make it particularly suitable for military organizations, international investigative teams, and war crime commissions operating in temporary or post-conflict environments. When administered by trained examiners using standardized protocols, VIPRE provides an efficient means of identifying areas requiring clarification, generating investigative leads, and documenting examination results while remaining an investigative aid that must always be corroborated by independent evidence.

Operationally, the VIPRE Voice Analyzer offers advantages that are especially relevant to deployed war crime investigations. International investigative teams frequently operate from temporary offices, forward operating locations, or mobile investigative units where equipment must be portable, rapidly deployable, and easily integrated with digital case-management systems. Because VIPRE requires relatively little specialized hardware compared with traditional polygraph instrumentation, examiners can establish examination capability with a smaller logistical footprint while maintaining standardized testing procedures. The system also lends itself to recording examinations for later supervisory review, quality assurance, and evidentiary documentation. When interpreters are required, VIPRE examinations can still be incorporated into structured interview strategies, provided that questioning is carefully planned and translation protocols preserve the integrity of the examination. These operational characteristics make the platform particularly appropriate for multinational investigative missions, military criminal investigative organizations, international tribunals, and commissions of inquiry that must evaluate numerous witnesses, victims, insiders, and suspects across geographically dispersed locations. Accordingly, the principal value of the VIPRE system lies not merely in its analytical software, but in its ability to support disciplined, repeatable, examiner-led investigative processes under demanding field conditions.

VSA offers several practical advantages. First, it is less physically intrusive than the polygraph. The absence of attached sensors may make the process less intimidating, which can be useful when interviewing witnesses, sources, or cooperative subjects. Tippett (1994) reported that examinees found VSA less intimidating than being attached to the polygraph instrument.

Second, VSA may be easier to integrate into an interview environment. The interview can remain more conversational, especially when the examiner is trained in rapport-based techniques. This matters in war crime investigations because overly aggressive interrogation methods can damage cooperation, create unreliable statements, and undermine later proceedings. The Principles on Effective Interviewing for Investigations and Information Gathering (2021), commonly known as the Méndez Principles, emphasize non-coercive interviewing and the pursuit of accurate, reliable information, which is consistent with using VSA as an aid to questioning rather than as a threat.

Third, VSA can help prioritize investigative resources. War crime investigations often involve many allegations, names, locations, and timelines. VSA can help identify which issues require further review. A stress response to a question about a specific detention site, convoy, commander, or date may guide investigators toward records, witnesses, satellite imagery, or forensic searches.

Fourth, VSA may assist with intelligence development. In the early stages of a war crime investigation, investigators may not yet have enough evidence for prosecution. They may be building a map of events, actors, units, locations, and command relationships. VSA-assisted interviews can help separate stronger leads from weaker ones.

Integration With Investigative Interviewing Standards

Modern investigative practice increasingly favors rapport-based, non-coercive interviewing. This approach is consistent with the use of VSA as an investigative aid rather than a coercive device. The examiner should not threaten the interviewee or claim that the instrument is infallible. Instead, the examiner should use VSA within a structured, professional interview that emphasizes truth, accuracy, and the opportunity to clarify information. This approach is consistent with both the Méndez Principles and the United Nations manual on investigative interviewing (Principles on Effective Interviewing for Investigations and Information Gathering, 2021; United Nations Department of Peace Operations et al., 2024).

A proper VSA-assisted war crime interview should include preparation, consent, question review, neutral delivery, recording where permitted, documentation of results, and follow-up questioning. Questions should be clear, direct, and tied to investigative facts. They should avoid compound wording, vague time frames, legal conclusions, or emotionally loaded accusations. For example, instead of asking, "Did you commit war crimes?" a better question would be, "On March 14, were you present at the detention site near [location] when prisoners were removed from the building?" Specific questions produce more useful investigative information.

VSA should also be integrated with corroboration. If a subject shows stress regarding a particular location, investigators should compare that response with witness statements, phone records, unit logs, photographs, open-source videos, satellite imagery, detention records, or forensic findings. The Berkeley Protocol provides guidance on gathering, analyzing, and preserving digital open-source information for investigations involving international criminal, human rights, and humanitarian law violations (OHCHR & Human Rights Center, University of California, Berkeley, School of Law, 2022). This approach strengthens the investigation because the instrument guides inquiry while independent evidence supports conclusions.

Investigative Workflow for a VIPRE-Assisted War Crime Interview

Figure 1 illustrates a recommended workflow for integrating the VIPRE Voice Analyzer into a structured war crime investigation. The process begins with case preparation, evidence review, and interview planning, followed by rapport development before the voice stress examination is conducted. The examination is followed by a structured post-test interview designed to explore areas of significant stress and generate investigative leads. Those leads are then evaluated through independent corroboration using witness statements, documentary records, digital evidence, forensic findings, and other investigative sources before investigators complete an overall case assessment. Consistent with the discussion throughout this paper, the VIPRE examination is intended to guide investigative decision-making rather than independently establish deception or criminal responsibility.

Figure 1. Investigative Workflow for a VIPRE-Assisted War Crime Interview

Evidentiary and Ethical Limits

Although this paper supports the use of VSA in the investigative process, it is important to state its limits clearly. VSA should not be used as the sole basis for arrest, charging, detention, or a finding that a person is truthful or deceptive. The same is true of the polygraph. The National Research Council (2003) cautioned that polygraph evidence must be understood within the limits of psychophysiological inference, and the same caution applies to VSA. Both are investigative tools. Their strongest value lies in helping investigators develop information.

In war crime cases, ethical safeguards are especially important. Witnesses and victims may be traumatized. Sources may be vulnerable. Subjects may be detained or under pressure. Therefore, VSA examinations should be voluntary, documented, and conducted by trained personnel.

The examiner should treat a stress response as a reason to ask further questions, not as proof of deception. This limitation is consistent with the Istanbul Protocol's emphasis on careful, rights-respecting documentation and with the broader non-coercive framework reflected in the Méndez Principles (OHCHR, 2022; Principles on Effective Interviewing for Investigations and Information Gathering, 2021).

These limits do not make VSA useless. They define its proper role. Most investigative tools have limits. Interviews, informants, eyewitness accounts, digital evidence, and forensic evidence all require interpretation and corroboration. VSA is no different. Used properly, it can help investigators locate the truth more efficiently.

Application to War Crime Investigative Strategy

A practical VSA strategy in war crime investigations would use the tool at selected points rather than in every interview. First, investigators could use VSA in source validation interviews to determine whether a source is withholding information, exaggerating access, or concealing conflicting loyalties. Second, they could use VSA in cooperative insider interviews to clarify command structures, orders, and specific events. Third, they could use VSA in subject interviews after investigators have developed enough facts to ask specific, relevant questions.

The best use of VSA would be issue-focused. For example, investigators might prepare question sets around the following topics: presence at a crime scene, knowledge of unlawful orders, participation in prisoner transfers, identity of commanders, concealment of bodies, use of prohibited weapons, destruction of records, or contact with known perpetrators. Levytskyi and Moskaliuk (2024) describe criminalistic support for war-crime investigations as a system of methods, tools, and techniques directed toward investigative tasks. A carefully prepared VSA question set can be presented as one such interview-support technique within that broader criminalistic framework.

This process can produce practical investigative benefits. It may lead to admissions, identify additional witnesses, expose false alibis, clarify timelines, or point investigators toward physical or digital evidence. Where digital evidence is involved, the Berkeley Protocol supports disciplined collection, analysis, and preservation of open-source information, making it a useful complement to interview-led investigative leads (OHCHR & Human Rights Center, University of California, Berkeley, School of Law, 2022). In that sense, VSA can be just as valuable as the polygraph in ferreting out the truth, provided that the examiner understands the tool and the investigation does not rely on the instrument alone.

Decision Framework for Conducting a VIPRE Voice Stress Examination During War Crime Investigations

Figure 2 below illustrates a structured decision framework for determining when a voice stress analysis examination using the VIPRE Voice Analyzer is appropriate during a war crime investigation. The framework emphasizes that the decision to conduct an examination should occur only after investigators have evaluated the circumstances of the interview, confirmed that participation is voluntary and ethically appropriate, and determined that sufficient investigative information exists to formulate clear, relevant, and issue-specific examination questions. Where interpreters are required, language planning and translation procedures should be established before the examination to preserve the integrity of both the interview and the analytical process.

Once these prerequisites have been satisfied, the VIPRE examination is conducted as one component of a broader investigative interview strategy. Stress responses identified during the examination do not establish deception, guilt, or criminal responsibility. Instead, they identify topics that may warrant additional questioning, clarification, or investigative follow-up. The post-examination interview provides the examiner with an opportunity to explore those areas through rapport-based, non-coercive interviewing techniques designed to obtain more complete and reliable information.

The final stage of the framework reinforces a central principle of both international investigative interviewing standards and the methodology presented throughout this paper: all investigative conclusions must be supported by independent corroboration. Statements, admissions, digital evidence, documentary records, witness testimony, forensic findings, open-source intelligence, and other investigative materials should be evaluated collectively before reaching any investigative or prosecutorial decision. Within this process, the VIPRE Voice Analyzer serves as an investigative support tool that assists examiners in prioritizing leads and directing investigative resources while remaining subordinate to the totality of the evidence.

Figure 2. Decision Framework for Conducting a VIPRE Voice Stress Examination During War Crime Investigations

Conclusion

Voice stress analysis has a legitimate role in the investigative process when used by trained examiners as part of structured, ethical, and corroborated interviews. In war crime investigations, VSA can assist with victim and witness interviews, source validation, and subject interviews. Its value is not that it replaces evidence, judges credibility by itself, or proves guilt. Its value is that it helps investigators identify stress points, focus questioning, obtain admissions, and develop leads.

The comparison between VSA and polygraph is useful because both tools occupy the same investigative space. Both are truth-verification aids. Both require careful question formulation, trained examiners, and proper interpretation. The Tippett (1994) comparative study supports the position that computerized VSA can produce results comparable to polygraph under controlled live-examination conditions. For war crime investigators, that finding supports the practical use of VSA as a truth-seeking tool.

Among currently available computerized voice stress analysis systems, the VIPRE Voice Analyzer is particularly well suited to support these objectives because it combines structured examination procedures with digital analytical capabilities in a format adaptable to both fixed and deployed investigative operations. Used by properly trained examiners and integrated with accepted investigative interviewing standards, the VIPRE platform can strengthen the efficiency and consistency of war crime investigations while preserving the fundamental requirement that all conclusions be supported by independent evidence.

A traditional investigation still depends on fundamentals: good interviews, careful documentation, corroboration, and disciplined follow-up. VSA should be placed within that framework. Used responsibly, it can strengthen the investigative process and help investigators move closer to the truth.

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