Detective Questions to Ask
These are the questions detectives ask a witness or a suspect: 58 of them in six groups. The first group is the handful nearly every interview comes back to: what happened, where were you, who can confirm it. The other five follow the order a careful interview runs, from the full account through the scene and the people to the checks on the story and the evidence that backs it up. The third is for the place itself, with the questions to ask witnesses at a crime scene while it is still in front of them: who has left, what was switched on, who has walked through since. They suit anyone who has to find out what happened, whether you work cases, report a story, run a workplace inquiry, write a mystery or host a murder mystery night.
The questions
Each question, and why to ask it
The basics
Can you walk me through what happened, from the very beginning?
Why ask it
Every interview is built around this one, and the skill is in what you do after asking it: nothing. Let the whole account come out before your first follow-up, because a person who is interrupted starts answering you instead of remembering.
Where were you when this happened, and for the hours either side?
Why ask it
It is the question everyone expects from a detective, and it works better as a window of hours than as a single moment. Take the whole answer down before testing any of it. A full evening on record is much harder to adjust later than ten minutes.
Who can confirm that, and how would I reach them?
Why ask it
An alibi is only as good as the person or record behind it. Get the name and number now, and note whether the confirming witness has a reason of their own to help, as a partner or a close friend would.
When did you last see or speak to them, and how did they seem?
Why ask it
Asked about a missing or injured person, it needs both halves. The date fixes the timeline. The mood, and whether it was unusual for them, points to what was going on in their life that week.
What did you see, hear or smell that seemed out of place?
Why ask it
The familiar 'did you notice anything unusual' gets a quick no, because it can be answered without thinking. Asking what, and naming hearing and smell as well as sight, sends the person back through the scene: a raised voice, an engine left running, cigarette smoke in a house where nobody smokes.
How do you know the people involved, and how did you get on with them?
Why ask it
A brother, a business partner and a neighbor will each tell the same evening differently, so you need the relationship before you can weigh the account. Listen for a connection described as more distant than it later turns out to be, and come back to it once you know more.
Who might have wanted to hurt them, or had fallen out with them, recently or long ago?
Why ask it
Asked cold, this sounds like an invitation to accuse, so most people start with 'nobody'. Go through money, work, neighbors and former partners one at a time, and write the disputes down as background, not as a list of suspects.
The account
What were you doing in the hour before you noticed anything?
Why ask it
Ordinary routine is easy to talk about, so it settles a nervous person and shows you how they tell a story when nothing is at stake. It also places them: where they were coming from, who they were with, what they had planned for the evening.
What was the first thing that told you something was wrong?
Why ask it
From this moment on the person was paying attention. Much of what they say about the minutes before it has been worked out afterward, so mark the point in your notes and measure everything else from it.
What did you do next, and why that?
Why ask it
Actions are easier to check than impressions: a call that was logged, a door that was locked, a neighbor who was fetched. The reason they give shows how serious it looked to them at the time, which is often different from how it looks in hindsight.
What was said, as close to the exact words as you can get?
Why ask it
'He threatened me' and 'she admitted it' are conclusions. The words themselves, even half-remembered, can be compared with another person's version and put to whoever is supposed to have said them.
How did it end, and where did everyone go?
Why ask it
Accounts tend to stop at the dramatic moment. The ending carries directions of travel, vehicles, who stayed behind and who left together, and those are the parts other witnesses and cameras can confirm.
What time was this, and how do you know the time?
Why ask it
The second half is the question. A time anchored to a phone, a train or a television program can be verified; a time offered as 'around nine' is an estimate, and it tends to drift by the next interview.
How long did it last, and what are you comparing that to?
Why ask it
Frightening minutes feel long, so a bare estimate is weak. A comparison holds up better: the length of the song that was playing, one change of the traffic lights, the time it takes to cross the parking lot.
The crime scene
Is the person who did this still nearby, and which way did they go?
Why ask it
At a fresh scene this comes before the story, because it is about safety and the answer expires in minutes. Pass a direction, a vehicle or a description on straight away, then come back for the full account.
Who was here when you arrived, and who has left since?
Why ask it
Onlookers drift off quickly, and the ones who go first are not always the ones who saw least. Take a name or a description for each person who has gone, so that somebody can find them later.
Who called for help, and what was said on the call?
Why ask it
An emergency call is usually logged with its time, which makes it an early fixed point for the timeline. The caller is often passing on what somebody else saw, so find out who told them and where that person is now.
Where exactly were you standing, and what could you see from there?
Why ask it
Sightlines fix the limits of a witness account. Someone who describes something their stated position could not have shown them is not necessarily lying, but that detail came from somewhere else and you need to know where.
How far away were you, and what was the light like?
Why ask it
Distance and lighting decide how much weight a description can bear. Have them point to something at the same distance now instead of giving a figure, since most people guess distances badly.
Was anything in the way of your view, or pulling your attention elsewhere?
Why ask it
A parked van, a phone in the hand, a child being held. The answer is not there to discredit anyone. It marks which parts of the account were watched and which were only glimpsed.
Were you tired or frightened, or had you had a drink or any medication that day?
Why ask it
Put it to every witness as routine, in a level voice, so it never lands as an accusation. An honest yes does not sink an account. It tells you which parts need backing up from another source.
Can you draw me a rough map of where everything was?
Why ask it
A sketch forces decisions that speech lets people skip, such as which side of the road and which door. Let them draw without help, then date the page and keep it with your notes.
Can you point out from here where each part of it happened?
Why ask it
Standing in front of the real place settles left and right, near and far, in a way a description from memory cannot. Keep the two of you at the edge while they point, so neither of you adds footprints to the ground you are asking about.
How did you get in, and where did you walk once you were inside?
Why ask it
Their route accounts for an opened gate, a muddy print or a door left ajar. It also marks the rooms they never entered, which they should not be asked to describe.
Was the door locked when you got here, and what was switched on?
Why ask it
Lights, a stove, a television and an unlocked door are the first things a helpful person changes. Put it to each early arrival separately, since the one who turned the lamp on may not think it worth mentioning.
What was missing, moved or different from how it normally is?
Why ask it
Only someone who knows the place can answer this, which is why it goes to the resident, the owner or the person who opens up in the morning. Ask it at the scene if you can, because an absence is hard to recall from a chair.
What did you touch, move or clean up before anyone else arrived?
Why ask it
People straighten a chair, sweep up broken glass or close a window without thinking, and rarely mention it unless asked. There is no blame in it. You are sorting which marks and positions belong to the incident and which to the tidying, and whose fingerprints have an ordinary reason to be there.
Who else has been in here since it happened?
Why ask it
Relatives, neighbors and ambulance crews all come with good reasons and all leave traces. A rough list of who went in, and in what order, lets whatever is found later be sorted into before and after.
Is there anything here that does not belong to the people who live or work here?
Why ask it
A second glass, a jacket over a chair or a car nobody recognizes points to someone the account has not mentioned yet. The person who knows the place can say within seconds what is theirs, and whatever is left over becomes your next line of inquiry.
Has anything like this happened before, here or to you?
Why ask it
A first incident and the fourth in a series are different inquiries. Earlier episodes may never have been reported, and one of them may hold what this one lacks, such as a name or a pattern of days.
People
Who else was there, and what was each of them doing?
Why ask it
Going through what each person was doing brings up the ones a witness does not count as involved: the delivery driver, the friend who had just left, the man waiting at the bus stop. Each of them saw the scene from a different spot.
Can you describe the person, starting with whatever you noticed first?
Why ask it
Letting them choose the starting point gets what actually registered: a limp, a voice, a jacket. Working down a checklist of height, build and hair invites a guess for every box, and in your notes a guess reads exactly like a memory.
Had you seen them before, and where?
Why ask it
Recognizing someone familiar and describing a stranger are different kinds of evidence, and the first usually holds up better. If the face was known, pin down from where and how many times before you move on.
Would you know them again if you saw them?
Why ask it
Take the answer, and how sure they sound, in their own words and leave it there for now. Showing a single photo or pointing someone out in the street can fix that face in the memory whether or not it is the right one, and formal identification has its own rules, which differ from place to place.
What were they wearing, carrying or driving?
Why ask it
Objects are often easier to trace than faces: a bag with a logo, a work uniform, a van with a ladder rack. Take partial details gladly. Two characters of a license plate narrow a search more than a confident guess at the whole thing.
Had anything changed for them lately, such as new friends, a new routine or money worries?
Why ask it
With a missing person in particular, a recent change is a common place for the inquiry to start: a new job, a breakup, a phone they had begun keeping face down. Put the question to family and coworkers separately, since people show different parts of their lives to each.
Had you noticed anyone hanging around in the days before, or any calls or visits you could not explain?
Why ask it
Some incidents are preceded by a look around, and the look only seems significant afterward. A car parked too long, a caller asking for a name nobody knows and a stranger with questions about the neighbors are each worth a date and a description.
Who gains from what happened, and who loses?
Why ask it
Motive is cheap to ask about and expensive to rely on. Money, a job, a relationship or a grudge will each produce names, and a motive by itself shows only who to speak to next.
Who had a key, a password or a reason to be there?
Why ask it
Access usually narrows the field faster than motive does. Count everyone, including the people nobody thinks of: the previous tenant, the contractor, the coworker who covers vacations.
Who else would know something about this?
Why ask it
Leave it until the account is complete, because names come more freely once someone has told the whole story. Ask for people on the edges: cleaners, drivers, neighbors, whoever locks up.
Checking the story
Was that a normal day for you, or did something take you off your usual routine?
Why ask it
Anyone who reviews the file later will ask why that day was different, so ask first. Most changes have dull causes, a late shift or a school pickup, and putting the dull cause on record closes the matter.
When did you first hear about this, and who told you?
Why ask it
The answer fixes what the person knew and when, which matters if they later mention a detail that was never made public. It also maps how the news moved through the group and who was calling whom that night.
Who have you talked to about this, and what did you tell them?
Why ask it
Each person they told is a witness to what was said while it was fresh, sometimes with a text message to show for it. Someone who says they have mentioned it to nobody at all is worth a gentle second pass, since most people tell somebody.
Which parts did you see yourself, and which did you pick up from other people afterward?
Why ask it
People who talk an event over start to share details, and they seldom notice the seam. Asked without blame, most can tell you what they watched and what they heard on the sidewalk afterward, and the two belong in separate columns of your notes.
Can you take me through it again, starting at the end and working backward?
Why ask it
Going backward makes the person rebuild each step instead of replaying the version they have already told, and it sometimes shakes loose a detail the forward telling skipped. Save it until you have the full account in the normal direction, and do not read a stumble as a lie: telling anything in reverse is hard.
Which part of what you have told me are you least sure about?
Why ask it
Inviting doubt is safer than challenging a detail, and people usually take the invitation. The part they nominate is the part to check first, not the part to disbelieve.
Earlier you said nine o'clock, and just now it was closer to ten. Can you help me fit those together?
Why ask it
Swap in whichever two statements do not match. Set side by side, with no hint of which you believe, they leave the person room to repair an honest slip, and many inconsistencies turn out to be two true things described badly.
Who would tell me a different version of this, and what would they say?
Why ask it
Hearing the competing account in this person's words shows you where they expect to be contradicted. Go to that other person next, and do not tell them what you were told to expect.
Is there anything you are holding back, and if so, what is stopping you?
Why ask it
The reason matters more than the content. Fear of a third party, embarrassment and legal exposure need three different responses, and only one of them is a further question.
Did you have anything to do with what happened?
Why ask it
Ask it once, plainly and late, and write the answer down word for word. How a denial is delivered proves little, because a flat no and an indignant speech both come from innocent people. If the answer is anything other than no, stop and find out what the rules where you are require before the next question.
Evidence and close
Is there a message, receipt or recording that would show what you have described?
Why ask it
A text with a time on it or a receipt from the gas station turns a memory into something that can be checked. Ask while the person is still glad to help, and ask them to keep the original instead of sending you a screenshot.
What would your phone, your bank card or your car show about where you were?
Why ask it
Most people leave a trail without thinking about it, and asking them to predict it is fairer than springing it on them later. Whether you can obtain those records yourself depends on your role and the law where you are, so check before you promise or threaten to look.
Is there any reason your name, your fingerprints or your belongings would turn up there?
Why ask it
This gives an innocent explanation its chance before any results come back: they visited last week, they lent the tool, they once held a key. Recorded now, it is believable. Offered for the first time after a match, the same explanation is far harder to accept.
Are there cameras, doorbells or dash cams that might have caught any of this?
Why ask it
Ask every witness, because the footage that matters is often a neighbor's and not the camera pointing at the scene. Many systems record over themselves after a short time, so find out who controls the recording and ask them to save it today.
Did you take any photos or write anything down at the time?
Why ask it
A picture or a few lines made within the hour outrank anything remembered a week later. Ask to see it on the device it was made on, where the date and time are still attached, before copies start going around.
What do you think happened here?
Why ask it
Hold it back until the facts are down, and label the answer as opinion in your notes. A theory is not evidence, but it shows where this person would look and what they believe about everyone else involved.
Where can I reach you over the next few weeks, and when is a bad time to call?
Why ask it
People often remember more in the days after an interview than during it, so the second conversation can be the better one. A number that works and an hour that is safe to call matter most for a witness who lives or works alongside the people involved.
What have I not asked you that I should have?
Why ask it
The usual closer, 'is there anything else you would like to add', tends to get a polite no. This version makes the gap the interviewer's fault, and a person who has been waiting to be asked about one thing will often say so here.
Running the interview
Practical guidance for the conversation itself
Why the order matters
The basics are the short version: seven questions nearly every interview comes back to, and enough for a first conversation at the door or a scene in a story. For a full interview the order of the other groups matters. A person gives one free account, and you get it at the start or not at all. Ask for the whole story, leave it uninterrupted, and write your follow-ups down instead of asking them as they occur to you. Only when the account is complete do you go back over the timings, the scene and the people, then move to Checking the story, and last to the evidence. Asking for the reverse-order telling early wrecks the account you have not yet collected. Asking what somebody is holding back before they have told you anything reads as an accusation and shuts the rest down.
Which questions for which person
An eyewitness
The account and The crime scene carry most of the interview, with Checking the story afterward. Use the description questions under People only after the free account, and take the description once. Each retelling smooths it a little further from what was seen.
Witnesses at a crime scene
On the spot the order bends. Whether the person responsible is still close and who has already left come before any story, and the crime scene questions to ask straight away are the ones whose answers go stale: what was switched on, who has walked through, what has been moved. Take a short account from each witness out of earshot of the others and keep the full interview for somewhere quieter. Who may enter a scene and who takes statements there depends on the country and the force, so if that is not your job, tell the officer in charge what you saw and stay outside.
Someone who knows the people or the place
A relative, a coworker or a neighbor may have seen nothing and still hold the most useful answers: who had access, who had fallen out, what is missing, whether it has happened before. Start with the last-contact and relationship questions in The basics, go on to People, and treat everything as background to be checked.
Someone whose own movements matter
Where were you, who can confirm it and whether it was a normal day are fair to ask anyone as routine elimination, and they should sound that way. Once a person is under real suspicion the rules change, and what you must tell them first, and who may be present, depends on the country and on whether you are police, an employer or a private investigator. Find that out before you carry on.
A character in a story or a game
For a mystery script or a murder mystery night, the same order makes a scene read as real: account first, alibi second, the awkward contradiction last. Give each character one answer that can be checked and one that cannot, and let the players work out which is which.
If you are not the investigator
Nobody has to answer a neighbor, a relative or a coworker, and pressing can make things worse. If you think a real crime has been committed, tell the police where you live what you know and leave the questioning to them. Confronting the person you suspect can put you at risk, and it can color what they and the witnesses say later.
Practical technique
- Stay quiet for a beat after an answer ends. People often add something into that silence that no question would have drawn out.
- Ask what happened, not whether something happened. Yes-or-no phrasing tells the person which answer you expect.
- Never supply a detail you have not been given. Once you name the blue car, the blue car appears in later accounts and you cannot tell where it came from.
- Take the time claim apart every time. How they know the time is more useful than the time.
- Write down the exact words for anything you may quote. Paraphrase is where accounts drift.
- Fix the next contact before you leave: what you will send, what they will look for, and when you will speak again.
Reading answers without overreading them
Nerves are not guilt
Fidgeting, poor eye contact and muddled detail are common in people telling the truth under stress, particularly if they are frightened of you or of someone else. Treat behavior as a prompt to ask more, never as a finding.
Accounts that are too smooth
Real memory is patchy and self-correcting. An account delivered in clean chronological order with no hesitation has often been told several times already, which is worth noting without assuming why.
Where inconsistency actually matters
Peripheral detail shifts between tellings in almost everyone. What matters is a change in the central sequence, or a detail that appears only after you have revealed what you know.
Separate observed from inferred
Witnesses report conclusions as if they were observations: he was angry, she was leaving. Ask what they saw that led to that word, and record the two things separately.
What goes wrong
Contaminating the memory
Showing a photograph, naming a suspect or describing the scene before the account is given can change what the person recalls, and afterward neither of you can tell which parts were theirs.
Interviewing witnesses together
Two people in one room produce one merged account, usually the more confident person's. Separate them and separate them early.
Committing to a theory
Once you have a preferred explanation, your questions start collecting support for it. If you notice you have stopped asking things that could disprove it, the interview has become a confirmation exercise.
Getting the legal footing wrong
The warning a suspect must be given, the right to a lawyer or a representative, consent to recording and the limits of your own authority differ by jurisdiction and by whether this is a criminal, employment or journalistic inquiry. Get that settled before the first question, because an otherwise good interview can be unusable.