The polygraph and the PEACE model of interviewing are two tools that can be used to gather information during an interrogation. The polygraph, also known as a lie detector, measures the subject’s physiological responses while answering questions. The PEACE model, on the other hand, is a framework used to create an environment of trust and collaboration during the interview. The PEACE Model and the polygraph, although different in their nature and application, can be complementary tools in the context of investigation and the assessment of truth and reliability. By integrating both methods, a more holistic and effective approach to obtaining reliable information can be created. Below, I present how you could discuss this compatibility and complementarity in your article or research:

Complementarity of the PEACE Model and the Polygraph

 Human and Technical Approach

PEACE Model: Focuses on the human aspect of the interview, promoting a non-coercive environment based on mutual respect to facilitate openness and honesty.

Polygraph: Adds a technical and scientific component to the process, measuring physiological responses that may indicate stress associated with lying.


Increased accuracy: The polygraph can help identify responses that are more likely to be deceptive.

Increased reliability: The PEACE model can help create an environment of trust that motivates the subject to tell the truth.

Increased efficiency: Integrating both tools can help reduce the time it takes to complete an interrogation.


Preparation: The interrogator must familiarize themselves with the case and the subject.

Explanation: The interrogator must explain to the subject the purpose of the interrogation and how the polygraph works.

Interview: The interrogator should conduct the interview using the PEACE model.

Analysis: The interrogator must analyze the subject’s responses and the results of the polygraph.

Conclusion: The interrogator should come to a conclusion about the subject’s veracity.


Integrating the polygraph and the PEACE model can be an effective way to increase the accuracy and reliability of the information obtained during an interrogation.

Phases of Integration

Preparation and Empowerment (PEACE): Before a polygraph session, the PEACE Model can be used to prepare the interviewee, establishing rapport and a trust environment that can reduce anxiety and improve the quality of the responses during the polygraph test.

Approach and Conversion (PEACE): The PEACE Model guides how the results of the polygraph can be discussed constructively, seeking clarifications and delving into the information obtained without pressure, maintaining an open dialogue.

Evolution (PEACE) and Polygraph Analysis: The integration of the information obtained through both the PEACE Model and the polygraph allows for a more complete and evolved assessment of the situation, contributing to more informed decisions.

Benefits of Complementarity

Increased accuracy in assessment: The combination of a human approach with technical analysis increases the accuracy of the truth and reliability assessment.

Reduction of false positives and negatives: Joint use allows mitigating the individual limitations of each method, such as anxiety in the polygraph or possible reluctance to reveal information in interviews.

Adaptability and continuous improvement: Feedback between the results of the polygraph and the PEACE interview process encourages continuous improvement in interrogation and analysis techniques.

Practical Implementation

Training and practice: Emphasize the importance of training professionals in both methods, ensuring their correct implementation and effective interpretation of the results.

Ethical considerations: Discussion on the importance of maintaining a high ethical standard when combining these tools, always respecting the rights and dignity of the interviewees.

Compatibility summary: Reaffirmation of how the PEACE Model and the polygraph, when used together, offer a robust and multidimensional approach to investigation and truth and reliability assessment.

Call for interdisciplinary collaboration: Encourage cooperation among professionals from different areas (psychology, investigation, forensic sciences) to explore and expand the possibilities offered by this combination of tools.

Effective Implementation

1.- Preparation

In the Context of the PEACE Model:

Definition: This stage involves meticulous preparation for the interview, including reviewing all available information, defining clear objectives for the session, and preparing the interview environment to facilitate constructive dialogue.

Application in Integration with the Polygraph: Preparation should also include familiarizing the interviewee with the polygraph process, reducing anxiety, and establishing a framework of trust and transparency from the start.

2.- Empowerment

In the Context of the PEACE Model:

Definition: This phase focuses on building a positive relationship with the interviewee, empowering them to feel secure and valued. It seeks to establish rapport, highlighting the importance of their cooperation and honesty.

Application in Integration with the Polygraph: Empowerment helps to mitigate the nerves or tension the interviewee may feel regarding the polygraph, ensuring that the physiological responses recorded more accurately reflect reactions to the questions asked.

3.- Approach

In the Context of the PEACE Model:

Definition: In this stage, the interview itself is conducted, using open interviewing techniques to explore the information the interviewee can offer. It emphasizes open questions that allow the interviewee to express themselves extensively.

Application in Integration with the Polygraph: The information gathered during the approach can be crucial for formulating specific questions in the polygraph session or for interpreting its results, especially if discrepancies or confirmations of the discussed topics arise.

4.- Conversion

In the Context of the PEACE Model:

Definition: This phase involves reviewing and analyzing the information obtained, converting it into useful intelligence. The credibility of the information is assessed, and plans are made on how to use it to advance the investigation.

Application in Integration with the Polygraph: The polygraph results can be analyzed in conjunction with the observations and statements obtained during the interview to gain a deeper and more complete understanding, identifying areas that require further exploration or confirmation.

 5.- Evaluation

In the Context of the PEACE Model:

Definition: The last phase of the model involves evaluating the entire process and the results obtained. Reflections on the effectiveness of the interview, the methods used, and how practices can be improved for future interviews are made.

Application in Integration with the Polygraph: Includes reviewing the integration between interviews conducted under the PEACE Model and the polygraph sessions, evaluating how each tool has contributed to the understanding and assessment of the truth, as well as the lessons learned for future applications.


Every stage of the PEACE Model, especially in synergy with the polygraph, reinforces a methodical and human approach in the assessment of trust and truthfulness, ensuring that the processes of interviewing and evaluation are as effective and ethical as possible. The joint implementation of the PEACE Model and the polygraph represents a significant advancement in interview and research methodologies, offering a robust framework that maximizes the effectiveness in gathering truthful and reliable information. This integration not only reflects a commitment to accuracy and fairness but also respects the dignity and rights of the interviewees, establishing a balance between the need to obtain critical information and the importance of maintaining ethical practices. The PEACE Model, with its emphasis on preparation, empowerment, proper approach, conversion of gathered information into useful intelligence, and evaluation of the process, provides a systematic and respectful approach to interviewing. When complemented with the physiological analysis offered by the polygraph, researchers have at their disposal a dual methodology that leverages the best of human and technological approaches to discern truth. Furthermore, this synergy underscores the importance of adaptability and continuous improvement in research practices, encouraging professionals to critically reflect on their methods and to always seek ways to optimize accuracy and efficiency. By integrating the PEACE Model with the use of the polygraph, a standard of excellence in research is established that benefits not only professionals in the field but also society at large, promoting justice and trust in legal and security systems. In conclusion, the combination of the PEACE Model and the polygraph illustrates the power of innovation when applied with a firm ethical commitment. This integrated approach not only improves the quality and reliability of the information gathered but also reinforces the value of interview and research practices that fully respect the integrity and human rights of all individuals involved.”