INVESTIGATION: Finding Out What Happened

🚨 The Call Comes In

The call has been made.

Police arrive at a property where a possible crime has occurred. There may be people nearby, evidence at the scene and plenty of unanswered questions.

But investigators can't simply rush in and start looking for clues.

The first response is about making the situation safe, understanding what is happening and protecting what may become important evidence.

What Happens First?

The first officers at a scene have several immediate priorities.

These priorities can happen quickly and sometimes at the same time.

It can involve:

🚨 Making the scene safe • 🩹 Helping the injured • 👥 Identifying people present • 👀 Assessing the scene • 🔒 Protecting potential evidence

The Scene Assessment

Before investigators start examining evidence in detail, they need to understand the scene.

They may ask:

What has happened?

Is anyone still in danger?

Who is here?

What areas need to be protected?

This first assessment helps determine what needs to happen next.

📖 Key Word - Crime Scene

A crime scene is a location where an offence is believed to have occurred or where evidence relating to an offence may be found.

A crime scene isn't always a single room or building. It can include vehicles, outdoor areas or multiple locations connected to an investigation.

🔎 The Scene Can Change

Every person who enters a scene can potentially disturb something.

A footprint could be walked over.

An object could be moved.

A door could be opened.

That's why controlling access to the scene can be so important.

The aim isn't to freeze everything exactly as it was forever — it's to limit unnecessary disturbance and preserve information that may matter later.

👉 ROOKIE TIP

Don't touch what you don't need to touch.

At a crime scene, even something that looks unimportant may become relevant later.

From First Response to Investigation

The first officers aren't expected to solve the entire case on arrival.

Their job is to establish the immediate situation and protect the scene.

From there, investigators can begin the more detailed work:

Observe → Record → Examine → Collect → Analyse

Each step adds another piece to the picture.

⚠️ REMEMBER

The first response isn't about solving the crime immediately.

It's about safety, information and preservation.

What happens in those first moments can affect everything that follows.

🧠 Think About It

Police arrive at a house after a suspected burglary. The front door is open and a broken window is visible.

A neighbour is standing inside the house, trying to see what happened.

Why might officers ask the neighbour to step outside?

Think about your answer before revealing the explanation.

🧩 Rookie Recruit Takeaway

The first response sets the investigation in motion.

Police must make the scene safe, help people, assess what has happened, gather initial information and protect potential evidence.

Before investigators can find out what happened, they first need to protect the opportunity to find out.

Coming Up Next ➡️

The scene is secure and the initial information has been gathered.

Now investigators need to start collecting the pieces that can help explain what happened.

Nextup:

Gathering Information ...

🔎 Where Does the Information Come From?

The scene has been secured.

Now investigators need to start building a picture of what happened.

Information can come from many different places — and one source rarely tells the whole story.

A victim might describe what happened. A witness might have seen something. A camera might show something completely different.

The job is to collect the information and work out how the pieces fit together.

Different Sources, Different Pieces

Each source has strengths and limitations.

It can come from:

👤 People • 🏠 Places • 📄 Records • 📱 Digital information • 🔬 Physical evidence

The more pieces investigators gather, the clearer the picture may become.

Information Isn't Automatically Proof

Someone might tell investigators that they saw a person near a crime scene.

That's useful information.

But investigators may still need to establish:

Was the person actually there?

When were they there?

What were they doing?

Information can create a lead without proving what happened.

📖 Key Word - Information

Information is knowledge or details gathered during an investigation that may help investigators understand events, identify people or develop leads.

Information can come from people, physical evidence, records, digital sources and many other places.

🧩 Putting the Pieces Together

Imagine investigators discover:

📹 CCTV showing a vehicle
👁️ A witness who noticed the vehicle
📱 A message sent around the same time
🧾 A receipt from a nearby shop

None of these pieces necessarily explains the entire event.

Together, however, they may help establish where someone was, when they were there and what they may have been doing.

👉 ROOKIE TIP

Don't judge a piece of information on its own.

Its importance often becomes clearer when it is compared with other information.

🔎 LOOK CLOSER

Different sources can sometimes disagree.

A witness may remember an event happening at one time.

A CCTV recording may show something different.

A record may provide another detail.

That doesn't automatically mean someone is lying.

Investigators need to examine the differences and work out which information can be supported.

⚠️ REMEMBER

More information doesn't always mean a clearer answer.

Investigators need to assess information, compare sources and consider whether it is reliable.

🧠 Think About It

A witness says they saw a red car leaving a crime scene at 10:00 pm.

CCTV shows a red car nearby at 9:50 pm.

What does this information tell investigators?

Think about your answer before revealing the explanation.

🧩 Rookie Recruit Takeaway

Investigators gather information from people, places, records, digital sources and physical evidence.

Each piece can contribute to the bigger picture, but information needs to be examined, compared and supported before conclusions are reached.

Gather the pieces. Then work out what they mean.

Coming Up Next ➡️

Information often comes directly from people who saw, heard or experienced something.

Next, we'll look at witnesses and the conversations investigators have with them.

Nextup:

Witnesses & Interviews ...

👁️ Someone Saw Something

A crime happens.

Someone nearby may have seen a person, heard an argument, noticed a vehicle or simply observed something that seemed unusual.

That person could become an important witness.

But getting useful information from a witness isn't just about asking questions.

It's about how those questions are asked and how the answers are recorded and understood.

What Can a Witness Tell Investigators?

Witnesses don't all experience an event in the same way.

One person might notice a face. Another might remember a sound or vehicle. Someone else may remember what happened immediately before the incident.

A witness doesn't need to have seen the entire event to provide useful information.

It can involve:

👂 Listening carefully • ❓ Asking questions • 🧠 Letting the witness remember • 📝 Recording information • 🔎 Checking details

Let Them Tell Their Story

Imagine a witness says:

“I saw someone running from the house.”

An investigator might want to know more.

But immediately suggesting:

“Was it a man wearing a black jacket?”

could influence how the witness responds.

A better approach may be to let the witness describe what they remember before introducing specific possibilities.

📖 Key Word - Witness

A witness is a person who may have information about an event because they saw, heard or otherwise experienced something relevant.

👂 Active Listening

• Good interviewing isn't just about asking questions.

• Investigators also need to listen carefully.

• That means paying attention to what the witness actually says, allowing them time to think and asking follow-up questions when something needs clarification.

• A pause doesn't necessarily mean someone has forgotten.

• Sometimes people simply need time to remember.

👉 ROOKIE TIP

Let the witness finish.

Interrupting too quickly can mean important details are missed.

🔎 LOOK CLOSER

Two witnesses can describe the same event differently.

One might remember the person's clothing.

Another might remember which direction they ran.

A third might remember the vehicle involved.

Different memories don't automatically mean someone is lying.

Investigators need to examine the differences.

⚠️ REMEMBER

A witness account is information not, automatically proof that every detail is correct.

Memory can be incomplete or affected by what a person noticed, understood or later remembered.

That's why witness information may need to be checked against other evidence.

🧠 Think About It

Two witnesses see the same person near a crime scene.

One remembers a red jacket.

The other remembers a dark jacket.

Does one witness have to be lying?

Think about your answer before revealing the explanation.

🧩 Rookie Recruit Takeaway

Witnesses can provide valuable information about what they saw, heard or experienced.

Good interviewing means asking appropriate questions, listening carefully and allowing people to describe what they remember without unnecessarily influencing their answers.

Listen first. Then investigate the details.

Coming Up Next ➡️

Witnesses can give investigators valuable information — but human memory isn't a perfect recording.

Next, we'll look at why people can observe the same event and remember it differently.

Nextup:

Observation & Memory ...

👀 Did You Really See Everything?

Imagine walking past a busy street.

A car drives through an intersection. Someone is arguing nearby. A cyclist passes. Your phone rings.

A few minutes later, someone asks you what happened.

You probably remember some things clearly but not everything.

This matters in investigations because people don't experience events like cameras.

What We Notice

Our attention is selective.

We tend to notice things that stand out, interest us or seem important at the time. Other details may never make it into our memory in the first place.

Observation vs Memory

Seeing something and remembering it later are not exactly the same thing.

This is one reason two people can experience the same event and later describe it differently.

📖 Key Word - Eyewitness

An eyewitness is someone who directly saw an event or part of an event.

Their account may provide useful information, but human memory can have limitations.

🧠 Memory Isn't a Recording

Think about the last time you tried to remember something from years ago.

You might remember the main event clearly but struggle with smaller details.

The same thing can happen to witnesses.

A person may confidently remember what happened while being less certain about exactly when, where or what someone was wearing.

👉 ROOKIE TIP

Confidence doesn't automatically mean accuracy.

Someone can genuinely believe they remember something correctly and still have remembered a detail incorrectly.

🔎 LOOK CLOSER

Two witnesses describe a person differently.

One remembers a dark jacket.

The other remembers a blue jacket.

That difference doesn't automatically mean one person is lying.

Investigators need to consider what each person could actually see, the conditions at the time and whether other evidence can support either account.

⚠️ REMEMBER

Memory can change.

People may unintentionally fill gaps, confuse details or become influenced by information they encounter after an event.

That doesn't mean every witness account is unreliable.

It means witness memory needs to be carefully examined.

🧠 Think About It

You witness a person running away from a shop.

You clearly remember the person was wearing a jacket, but you're unsure whether it was black or dark blue.

Which detail should you be more confident about?

Think about your answer before revealing the explanation.

🧩 Rookie Recruit Takeaway

Witnesses can provide valuable information, but observation and memory have limitations.

Investigators need to consider what a person could see, what they noticed and what they later remembered — then compare those accounts with other evidence.

Seeing isn't always remembering.

Coming Up Next ➡️

We've seen how witnesses provide information and why their memories may differ.

Next, we'll look at how investigators use alibis and timelines to establish where people were and when events occurred.

Nextup:

Alibis & Timelines ...

🕐 Where Were You?

A crime happens at 8:30 pm.

One person says they were at home.

Another says they were at a restaurant.

Someone else says they were driving across town.

Investigators need to work out where people were and when they were there.

That's where alibis and timelines become useful.

Building the Timeline

A timeline puts events into order.

Investigators may compare different pieces of information to establish what could have happened.

The timeline doesn't automatically prove anything.

It helps investigators ask whether the different pieces of information fit together.

It can involve:

📖 Key Word - Alibi

An alibi is information or a claim that a person was somewhere else when an offence occurred.

An alibi might come from another person, a record, CCTV or other information that helps establish someone's location.

Does an Alibi Prove Someone Is Innocent?

Not automatically.

An alibi needs to be examined like other information.

For example, someone might say:

“I was at the cinema.”

Investigators could then ask:

• When did they arrive?

• When did they leave?

• Is there a record of the visit?

• Did anyone see them?

• Does the timing fit with the rest of the investigation?

The purpose is to test the alibi, not simply accept or reject it.

👉 ROOKIE TIP

An alibi isn't just “I wasn't there.”

It's information that can help establish where someone actually was.

🔎 LOOK CLOSER

Sometimes the most useful part of an alibi isn't the person who provides it.

It might be something that independently supports the person's account.

A receipt, CCTV recording or phone record may help confirm a location and time.

The more independently supported information investigators have, the clearer the timeline can become.

⚠️ REMEMBER

A timeline is built from evidence NOT just someone's story.

Investigators compare accounts with records, observations and other information to see whether the pieces fit.

🧠 Think About It

A person says they were at a restaurant when a burglary occurred.

A receipt shows they paid at the restaurant at 8:20 pm, while CCTV shows them leaving at 8:25 pm. The burglary occurred at 8:30 pm several kilometres away.

What could investigators learn from this?

Think about your answer before revealing the explanation.

🧩 Rookie Recruit Takeaway

Alibis and timelines help investigators establish where people were and when events occurred.

By comparing statements with independent information, investigators can test whether different pieces of the story fit together.

Put the events in order. Then see what fits.

Coming Up Next ➡️

Investigators don't always start with a complete answer.

Sometimes they have a small piece of information that points them towards something worth exploring.

Next, we'll look at leads, clues and tips — and why they aren't all the same thing.

Nextup:

Leads, Clues & Tips ...

🧭 Something Points Somewhere

Investigators don't always have a clear answer.

Sometimes they have a small piece of information that suggests where to look next.

A witness mentions a vehicle.

A camera captures someone near the scene.

A member of the public reports something unusual.

These pieces of information can send an investigation in a particular direction — but that doesn't mean they've established what happened.

Three Ways Information Can Help

The words lead, clue and tip are often used interchangeably, but they can describe different roles during an investigation.

A single piece of information could potentially be all three.

The important thing is that information still needs to be investigated.

It can point towards:

👤 A person • 📍 A location • 🚗 A vehicle • 🕐 A time • 🔎 Another piece of evidence

🔎 A Lead Isn't a Conclusion

Imagine someone reports seeing a suspicious vehicle near a burglary.

That's potentially useful.

Investigators might ask:

Who owns the vehicle?

Was it actually there at the relevant time?

Who was driving it?

Is there anything else connecting it to the burglary?

The original report points investigators somewhere.

The investigation determines whether that direction leads anywhere useful.

📖 Key Word - Lead

A lead is information that gives investigators a possible direction to pursue.

A lead can help investigators decide what to investigate next, but it does not automatically establish what happened.

Following the Lead

A lead might produce more information.

That information might support the original idea or it might rule it out.

For example:

The investigation develops as each piece is checked.

👉 ROOKIE TIP

A lead tells you where to look.

It doesn't necessarily tell you what you'll find.

⚠️ REMEMBER

A clue is not automatically evidence that proves what happened.

Information becomes more useful when investigators can verify it, connect it with other information and establish its significance.

🧠 Think About It

A caller tells police that they saw a person acting suspiciously near a house shortly before a burglary.

Is that enough to identify the person as the offender?

Think about your answer before revealing the explanation.

🧩 Rookie Recruit Takeaway

Leads, clues and tips can help investigators find their next direction.

But a direction isn't the destination.

Investigators follow up information, test it and compare it with other evidence to work out what actually happened.

Follow the lead. Check the facts.

Coming Up Next ➡️

Investigators can collect hundreds of pieces of information during a case.

The challenge is working out how those pieces might fit together — and being prepared to change direction when they don't.

Nextup:

Building a Case Theory ...

🧱 Putting the Pieces Together

Investigators have gathered information.

They have statements, timelines, records, observations and other evidence.

Now they need to ask:

How might all of this fit together?

A case theory is an explanation of what investigators believe may have happened, based on the information available at that point.

But there's an important catch:

A theory is not a fact.

One Case - Different Possibilities

Imagine a person is found injured outside their home.

Investigators discover that:

• their front door was open

• a neighbour heard an argument

• their phone is missing

• someone was seen leaving the area

There could be several explanations.

At this stage, investigators shouldn't simply choose their favourite explanation.

They need to test the possibilities.

A theory can change when:

🔎 New evidence appears • ❌ Something doesn't fit • 👁️ A witness changes the picture • 🕐 The timeline changes • 🧩 Another explanation makes more sense

🔎 Test the Theory

Suppose investigators believe the person was attacked during a burglary.

Then they discover that nothing was stolen.

That doesn't automatically prove the theory is wrong.

But it creates a question:

Does the evidence still support our explanation?

Good investigators don't ignore information simply because it doesn't fit.

They reconsider.

📖 Key Word - Case Theory

A case theory is an explanation of what investigators believe may have happened, based on the information and evidence available.

It can change as new information is discovered.

Don't Force the Pieces to Fit

Imagine putting together a jigsaw puzzle.

If one piece doesn't fit, you don't usually force it into the wrong space just because you've already decided where it belongs.

Investigations can work in a similar way.

When evidence doesn't fit the theory, investigators may need to:

check the evidence → question the theory → consider alternatives → revise their explanation

👉 ROOKIE TIP

A good theory should explain the evidence NOT make the evidence fit the theory.

⚠️ REMEMBER

Changing a theory isn't failing.

New evidence can change what investigators believe happened.

Being willing to change direction can prevent investigators from becoming locked into an explanation that isn't supported by the evidence.

🧠 Think About It

Investigators believe a burglary was committed by someone who knew the building.

Later, CCTV shows that the offender had never been inside before and appears unfamiliar with the layout.

Should investigators ignore this because they already have a theory?

Think about your answer before revealing the explanation.

🧩 Rookie Recruit Takeaway

A case theory helps investigators organise information and develop an explanation of what may have happened.

But theories are not conclusions.

They must be tested against the evidence — and changed when the evidence doesn't fit.

Build the theory. Test the theory. Change it when necessary.

Coming Up Next ➡️

Investigations depend on more than physical evidence and records.

People communicate constantly through what they say, how they listen and even what they don't say.

Nextup:

Communication in an Investigation ...

🗣️ It's Not Just About Talking

Investigations involve people.

Victims, witnesses, suspects, police officers and other people may all have information that could help explain what happened.

Getting that information isn't simply a matter of asking questions.

Investigators need to communicate clearly, listen carefully and pay attention to how information is being given.

Good Communication Has Two Sides

Communication isn't just about what an investigator says.

It's also about how they listen and respond.

👂 Listen Before You Lead

Consider these two questions:

“What did you see?”

and

“You saw a man in a black jacket, didn't you?”

The first allows the person to describe what they remember.

The second already suggests an answer.

Good communication aims to gather information without unnecessarily influencing the person providing it.

📖 Key Word - Active Listening

Active listening means giving careful attention to what someone is saying, showing that you are listening and asking appropriate questions to clarify what they mean.

It's more than simply hearing the words.

🔎 Communication Isn't Only Words

People communicate through more than speech.

Their tone, facial expressions, posture, pauses and other behaviour can provide context.

But these things shouldn't automatically be treated as proof that someone is lying or hiding something.

A person avoiding eye contact, for example, doesn't automatically mean they're being dishonest.

Context matters.

👉 ROOKIE TIP

Listen to what someone actually says before deciding what you think they mean.

The Goal Is Reliable Information

Investigators want information they can understand, record and assess.

That means giving people enough opportunity to explain themselves, clarifying important details and checking information against other evidence where possible.

Communication can help uncover information.

It can also reveal what still needs to be checked.

⚠️ REMEMBER

Body language is not a lie detector.

Non-verbal behaviour can provide context, but investigators shouldn't assume they know what someone is thinking simply from the way they behave.

🧠 Think About It

A witness pauses several times while describing what happened.

Does that automatically mean they are lying?

Think about your answer before revealing the explanation.

🧩 Rookie Recruit Takeaway

Good investigative communication means asking clear questions, listening carefully, allowing people to explain and checking what you hear.

Words and behaviour can both provide information, but neither should be interpreted without context.

Listen carefully. Ask thoughtfully. Check the facts.

Coming Up Next ➡️

You've now followed the investigation from the first response through gathering information, interviewing witnesses, examining memory, building timelines, following leads and developing theories.

Now it's time to put your investigation skills to work.

Nextup:

ACTIVITY - Put the Investigation in Order ...

🚨 Investigators arrive at a crime scene.

Each stage of the investigation adds another piece to the picture.

The five stages below have been mixed up.

Put them in the correct order:

A - Relevant evidence is carefully collected and preserved to prevent contamination or loss.

B - Investigators carefully look over the scene and identify anything that may be relevant.

C - The scene and its evidence are documented using photographs, notes and other records.

D - Evidence is subjected to closer examination to determine what it may reveal.

E - Investigators interpret the information gathered and consider what it tells them about the crime.