A good investigative interview is not about forcing someone to say what the interviewer expects to hear. Its real purpose is much simpler: gather as much accurate and useful information as possible while treating the interviewee fairly.
That is why understanding how ethical interviews gather clear and reliable information matters in modern policing.
Victims, witnesses, and suspects may all hold important information, but stress, memory limitations, unclear questions, assumptions, or inappropriate pressure can affect what gets communicated.
Modern interviewing guidance increasingly favours information-gathering approaches.
The FBI’s High-Value Detainee Interrogation Group describes its work as developing ethical, lawful, science-informed interviewing techniques, while the United Nations promotes investigative interviewing grounded in human rights and reliable information gathering.
For police students, the main lesson is important: an effective interviewer is not simply a skilled talker.
They are a careful listener who plans questions, remains open-minded, documents information accurately, respects legal safeguards, and checks statements against other available evidence.
1. Ethical Interviews Focus on Information, Not a Predetermined Answer
An investigator may enter an interview with a theory about what happened. The problem begins when that theory turns into an assumption that must be confirmed.
Ethical interviewing takes an information-gathering approach instead.
The College of Policing’s PEACE framework structures interviews around Planning and Preparation, Engage and Explain, Account, Clarification and Challenge, Closure, and Evaluation.
Its guidance encourages interviewees to provide their accounts in their own words before detailed clarification takes place.
This encourages investigators to remain open to different possibilities.
Imagine interviewing someone who witnessed a fight outside a shop. Instead of beginning with, “You saw the man in the red shirt start the fight, didn’t you?” an interviewer could ask, “Tell me everything you remember about what happened outside the shop.”
The second question creates space for information the investigator may not yet know.
That difference is small in wording but important in practice.
2. Rapport Can Make Communication Easier
Rapport does not mean becoming friends with the person being interviewed. It means creating a professional environment where communication can occur respectfully.
Simple behaviours matter: introducing yourself, explaining the interview process, listening without unnecessary interruption, and treating the person with dignity.
The FBI’s HIG maintains a large research programme examining evidence-based interviewing practices, including research on building and maintaining rapport and its relationship with cooperation and information disclosure.
Rapport can be especially useful when an interviewee is nervous, frightened, embarrassed, or unsure about speaking with police.
Consider a witness who has just experienced a frightening incident. Immediately firing rapid questions may make communication more difficult. Giving the person a clear explanation of what will happen and allowing them time to speak may produce a fuller account.
Rapport Is Not Manipulation
There is an important distinction.
Rapport should support communication, not disguise threats, promises, intimidation, or improper pressure. The broader movement toward ethical investigative interviewing specifically emphasises lawful, non-coercive methods for obtaining useful information.
Respect and effectiveness are not opposites.
3. Open-Ended Questions Encourage Fuller Accounts
One of the most useful interviewing techniques is also one of the simplest: ask questions that allow people to explain events in their own words.
Questions beginning with phrases such as “Tell me about…”, “Describe what happened…”, or “What did you notice next?” can produce more detailed responses than questions that demand only yes-or-no answers.
College of Policing guidance recommends free recall in witness interviews, allowing people to provide their account with minimal interruption before more specific questions are introduced.
FBI guidance on cognitive interviewing similarly describes approaches built around open narration followed by more focused follow-up questions.
Suppose a witness says, “I heard something and then saw a car leave.”
The interviewer might respond, “Tell me everything you remember about the car.”
Only later might more specific questions be useful: “Do you remember its colour?” or “Which direction did it travel?”
Starting broad reduces the risk that the interviewer accidentally supplies details that originally came from the investigator rather than the witness.
4. Active Listening Helps Interviewers Notice Important Details
Good interviewing involves far more listening than many people expect.
While an interviewee speaks, the investigator should be paying attention to names, locations, times, actions, relationships, gaps, and details that may need clarification later.
Interrupting too frequently can break someone’s train of thought.
In free-recall interviewing, College of Policing guidance recommends active listening, allowing pauses, and using minimal prompts that stay within the interviewee’s account.
Imagine a witness pauses for several seconds.
An inexperienced interviewer might immediately fill the silence with another question. A more patient interviewer may allow the person time to remember what happened next.
Silence can feel uncomfortable, but it is not always a problem.
Active listening also means noticing when something is unclear without immediately deciding it is false. If a timeline appears inconsistent, the interviewer can return to it later and ask for clarification.
The goal is understanding, not winning an argument.
5. Leading Questions Can Affect the Information You Receive
Human memory is not a perfect video recording.
What people remember can be influenced by attention, stress, time, and the way questions are asked. NIJ research on eyewitness evidence notes that interview structure, timing, questioning, and feedback can influence later identification and memory-related processes.
This is why suggestive questions deserve caution.
Suppose a witness says they saw someone holding an object.
Asking, “How long was the knife?” introduces the idea that the object was definitely a knife. A more neutral question would be, “Can you describe the object you saw?”
The interviewer may already have evidence suggesting it was a knife, but the witness should ideally provide their own memory rather than simply agreeing with information contained in the question.
Open-ended interviewing helps reduce this problem.
Research hosted by NIJ has examined witness interviews using open-ended questions alongside suggestive questions, demonstrating why question design remains an important area of investigative research.
Neutral wording protects the quality of the information being gathered.
6. Ethical Interviewing Includes Legal Rights and Safeguards
Police interviews do not operate outside the law.
The exact rights and procedures vary by jurisdiction and may differ depending on whether the person is a witness, victim, suspect, child, vulnerable adult, or someone in custody.
Investigators therefore need to understand the legal rules applying to the particular interview.
International guidance has increasingly connected effective interviewing with human-rights protections.
The UN’s Méndez Principles promote a move away from confession-driven practices toward rapport-based, information-gathering interviews accompanied by appropriate legal and procedural safeguards.
UNODC’s investigative interviewing manual similarly integrates effective investigation techniques with human-rights-compliant policing.
For police students, this means learning procedure as carefully as learning questions.
An interview that produces useful information but violates applicable law or fundamental protections can create serious ethical and legal problems.
Good investigative work must be both effective and lawful.
7. Reliable Information Should Be Checked Against Other Evidence
An interview statement is an important source of information, but investigators should avoid treating it as the entire investigation.
Statements should be compared with other available evidence whenever possible.
That might include security-camera footage, digital records, photographs, physical evidence, timelines, forensic results, documents, or statements from other witnesses.
FBI investigative guidance stresses that interviews should be considered alongside witness statements, forensic material, and other evidence rather than relied upon in isolation.
Imagine someone says they arrived at a location at 9:00 p.m.
Investigators might later compare that account with surveillance footage, transaction records, phone information obtained through lawful procedures, or another witness’s observations.
A difference does not automatically prove dishonesty. The person may simply have remembered the time incorrectly.
That is where careful clarification becomes important.
The purpose of verification is not to force every piece of information into the investigator’s original theory. It is to see which explanation best fits the evidence available.
8. Accurate Recording and Evaluation Finish the Interview
The interview is not finished simply because the questions have stopped.
Investigators need an accurate record of what was said, according to the recording and documentation rules of their jurisdiction and agency.
They should also evaluate what they learned.
The final stage of the PEACE framework is Evaluation, encouraging investigators to consider the information obtained and the effectiveness of the interview process itself.
Useful questions include: What new information did the interview provide? Which details require verification? Are there inconsistencies that need another explanation? Did the interviewer accidentally make assumptions or overlook an important topic?
Evaluation also helps officers improve professionally.
Perhaps an interviewer interrupted too often. Maybe a question was unnecessarily complicated or too leading. Recognising those weaknesses makes the next interview better.
Ethical interviewing is therefore not a script that officers memorise once.
It is a skill that improves through preparation, practice, reflection, and evidence-based training.
Understanding how ethical interviews gather clear and reliable information starts with changing the goal of the conversation.
A strong investigative interview is not about obtaining a particular answer. It is about creating the best conditions for accurate information to emerge.
Planning, rapport, open-ended questions, active listening, neutral language, legal safeguards, accurate documentation, and independent verification all contribute to that process.
Ethical methods also help investigators remain open to explanations that may differ from their first theory.
For police students, practise interviewing as a listening skill rather than simply a questioning skill. Ask people to explain events in their own words, separate facts from assumptions, and always compare what you hear with other available evidence.
A reliable investigation is built by discovering what happened-not by deciding the answer before the interview begins.