SUSPECT: Following the Person of Interest

🕵️ When a Person Enters the Investigation

Investigators have been gathering information.

A witness mentions someone.

A piece of evidence connects a person to a location.

A person's actions or circumstances raise questions.

Suddenly, investigators have someone they want to know more about.

But what do you call that person?

The terminology matters because being connected to an investigation does not mean someone committed the crime.

Not Everyone Is a Suspect

There can be many reasons a person's name appears during an investigation.

They might be a witness, victim, person of interest, suspect or eventually someone formally accused of an offence.

The exact terminology and legal definitions can vary between jurisdictions.

A person might be connected because they:

👁️ Saw something • 📍 Were nearby • 👥 Know the victim • 🕐 Were in the area at the relevant time • 🔎 Are linked by evidence

A connection creates a reason to investigate.

It doesn't create guilt.

📖 Key Word - Suspect

A suspect is a person who investigators have reason to believe may have been involved in an offence.

Being a suspect does not mean the person is guilty.

Person of Interest

You may also hear the term person of interest.

It is commonly used for someone investigators want to examine more closely because they may have relevant information or a possible connection to the investigation.

Unlike suspect, it doesn't necessarily indicate that investigators believe the person committed the offence.

The exact meaning and use of the term can vary.

These labels aren't interchangeable.

🔎 Why Do the Labels Matter?

Imagine a person was seen near a burglary.

That makes them relevant to the investigation.

But there could be completely innocent explanations.

Maybe they live nearby.

Maybe they were visiting someone.

Maybe they were simply walking past.

Investigators need evidence to determine whether the person's connection is meaningful.

A Connection Can Lead To Questions

Seen near the scene:

This is investigation - not assumption.

👉 ROOKIE TIP

Being a suspect is not the same as being guilty.

A suspect is someone investigators are considering.

The evidence still has to support what happened.

⚠️ REMEMBER

Suspicion can point investigators towards a person.

It cannot, by itself, establish that the person committed the crime.

🧠 Think About It

A witness tells police that they saw a person near a house shortly before a burglary.

Can the witness's account give investigators a useful lead?

Think about your answer before revealing the explanation.

🧩 Rookie Recruit Takeaway

People can become connected to an investigation for many different reasons.

Understanding the difference between witness, person of interest, suspect and accused helps keep suspicion separate from guilt.

A name in an investigation is a question NOT an answer.

Coming Up Next ➡️

Once investigators have a person they want to examine more closely, they need to work out how that person became connected to the investigation in the first place.

Nextup:

Identifying a Suspect ...

🔎 How Does Someone Become a Suspect?

Investigators don't usually start an investigation knowing who committed the crime.

A person may become a suspect because different pieces of information begin pointing towards them.

Perhaps a witness saw them nearby.

Maybe evidence connects them to the scene.

Perhaps they had an opportunity to commit the offence.

One piece of information may raise a question.

Several pieces may make that person worth investigating more closely.

Follow the Connections

Imagine a burglary at a small business.

Investigators discover that one person:

• was nearby when the burglary occurred

• knew the building

• had previously mentioned the valuable equipment inside

• was identified by a witness

None of these facts automatically proves that person committed the burglary.

But together, they may provide reasons for investigators to look more closely.

A person may become a suspect through:

What Makes a Connection Useful?

Not every connection has the same importance.

Investigators need to ask whether the information is reliable and whether it actually connects the person to the offence.

The answers help investigators decide whether the connection deserves further investigation.

📖 Key Word - Investigative Lead

An investigative lead is information that gives investigators a possible direction to explore.

A lead can point towards a person, place, object or event, but it doesn't automatically prove involvement.

🧩 One Connection Isn't Enough

Suppose someone's fingerprints are found at a crime scene.

That sounds significant.

But what if the person works there?

Suddenly, the fingerprint has a different context.

This is why investigators need to look beyond “Is this person connected?”

They need to ask:

“What does the connection actually mean?”

👉 ROOKIE TIP

Don't stop at the connection. Investigate the reason behind it.

🔎 LOOK CLOSER

Opportunity can be important.

If someone had access to a location at the right time, that may make them relevant.

But opportunity is not proof.

Many innocent people can have access to the same place.

⚠️ REMEMBER

Being identified as a suspect doesn't mean the investigation is finished.

It means investigators now have a person whose possible involvement needs to be examined.

Evidence still has to support the conclusion.

🧠 Think About It

A person is identified as being near a crime scene shortly before an offence.

They also knew the victim.

Is that enough to establish that they committed the crime?

Think about your answer before revealing the explanation.

🧩 Rookie Recruit Takeaway

Suspects can be identified through evidence, witness information, opportunity, relationships and investigative leads.

But becoming a suspect is only the beginning of the process.

A connection creates a question. Evidence helps answer it.

Coming Up Next ➡️

Once investigators have identified a potential suspect, they can start examining the circumstances surrounding the offence more closely.

Next, we'll revisit three important pieces of the puzzle: motive, opportunity and capability.

Nextup:

Motive & Opportunity Revisited ...

🎯 Why Them? Why Then?

Investigators have identified a potential suspect.

Now they can take another look at three important questions:

Did they have a reason?

Did they have the opportunity?

Did they have the capability?

These questions can help investigators understand how a person might fit into the events — but none of them automatically proves involvement.

Motive Isn't Always Obvious

A motive is a reason someone may have for committing an offence.

Money might be a motive.

Revenge might be a motive.

Fear, jealousy, anger or personal gain might also play a role.

But investigators don't always find a clear motive.

A crime can still occur even when the reason isn't immediately known.

📖 Key Word - Capability

Capability is a person's ability or capacity to carry out an offence.

It can involve having the skills, physical ability, knowledge, access or resources required.

🔗 Three Pieces of the Puzzle

Imagine a person is suspected of stealing from their employer.

MOTIVE
They were experiencing financial difficulties.

OPPORTUNITY
They had access to the company's storage area.

CAPABILITY
They knew how the security system worked.

That combination may make the person worth investigating.

But investigators still need evidence connecting them to the actual offence.

Investigators may ask:

💭 Motive - Why might they do it?
🕐 Opportunity - Could they do it at the relevant time?
🛠️ Capability - Could they actually carry it out?

These factors become more useful when examined alongside other evidence.

🔎 LOOK CLOSER

A person can have all three and still be innocent.

Someone may have a motive, an opportunity and the ability to commit a crime — but that doesn't mean they actually did.

That's why investigators need to move beyond possibility and look for evidence.

👉 ROOKIE TIP

Think of motive, opportunity and capability as questions to investigate, not boxes that prove guilt.

The Real Question

The important question isn't:

“Could this person have done it?”

It's:

“What evidence connects this person to what actually happened?”

That shift is important.

Lots of people could commit a crime.

Investigators need to establish what the evidence shows about the person they are investigating.

⚠️ REMEMBER

Motive is not required to prove that someone committed every offence.

And having a motive doesn't prove that someone acted on it.

🧠 Think About It

A person has a strong motive to steal from a business, had access to the building and knew how to disable its alarm.

Can these factors give investigators a reason to investigate the person further?

Think about your answer before revealing the explanation.

🧩 Rookie Recruit Takeaway

Motive, opportunity and capability can help investigators understand why a person might be involved, whether they could have been involved and whether they had the ability to carry out the offence.

But possibility isn't proof.

Could they? Isn't the same as did they.

Coming Up Next ➡️

Sometimes the strongest questions don't come from a person's motive or opportunity.

They come from what they actually did - and whether their behaviour forms a pattern.

Nextup:

Patterns & Behaviour ...

🧠 Behaviour Can Leave a Pattern

Investigators don't only look at what happened once.

They may also look at what a person repeatedly did.

Imagine several offences occurring over a period of time.

Different locations. Different victims. Different dates.

But investigators notice some similarities.

The question becomes:

Are these similarities meaningful OR just coincidence?

Look for What Repeats

A pattern can appear in many different parts of behaviour.

A person might repeatedly target similar locations, approach victims in a similar way or behave in a particular way before or after an offence.

Patterns might appear in:

📍 Locations • 👥 Victims • 🕐 Timing • 🚗 Approach • 🎯 Target selection

📖 Key Word - Behavioural Pattern

A behavioural pattern is a repeated or recurring way of behaving that may be identified across events.

A pattern can help investigators compare offences and generate questions, but it doesn't automatically establish that the same person was responsible.

One Event vs Several

Consider these two situations:

One burglary:
A rear door is forced open.

Four burglaries:
The rear door is forced open each time, the offences occur late at night and similar items are taken.

The repeated features may now be worth examining.

But investigators still need to ask whether those similarities have an innocent explanation.

🔎 LOOK CLOSER

A pattern doesn't have to mean “the same offender.”

Two crimes may look similar because the locations have similar security, the victims have similar routines or the opportunity was simply similar.

Patterns are useful because they create questions to investigate.

👉 ROOKIE TIP

Look for repetition but don't force a connection.

Similar behaviour can be a lead.

It still needs evidence.

Behaviour Can Change

People don't always behave exactly the same way every time.

Circumstances can change.

An offender may alter their approach because something went wrong, because security improved or simply because the opportunity was different.

So investigators need to look at both:

What stayed the same?

and

What changed?

⚠️ REMEMBER

A pattern is not proof of identity.

Similar behaviour can help investigators connect events for further investigation, but other evidence is needed to establish who was responsible.

🧠 Think About It

Three burglaries occur in the same neighbourhood.
In each case, the offender enters through an unlocked rear door and steals small electronic items.

Can these similarities provide investigators with a useful lead?

Think about your answer before revealing the explanation.

🧩 Rookie Recruit Takeaway

Investigators can examine behaviour across multiple events to identify repetition, similarities and differences.

Patterns can help generate leads and connections, but they must be tested against other evidence.

Spot the pattern. Question the pattern. Don't assume the pattern.

Coming Up Next ➡️

Behaviour can sometimes reveal a repeated way of carrying out an offence.

Next, we'll look at two concepts investigators use when examining behaviour: modus operandi and behavioural signature.

Nextup:

MO & Signature ...

🎭 Same Crime. Same Behaviour?

Imagine two burglaries.

In both cases, the offender enters through a rear window, avoids the alarm and takes valuable electronics.

Investigators might notice the similarities and ask:

Are these offences connected?

To explore that question, investigators may examine the offender's modus operandi and behavioural signature.

They sound similar.

But they aren't the same thing.

📖 Key Word - Modus Operandi (MO)

Modus operandi, usually shortened to MO, means the method used to carry out an offence.

It can include things such as how an offender approaches a target, gains entry, avoids detection and completes the offence.

The MO can change and adapt.

🛠️ MO: How They Do It

An offender might:

Choose a particular type of target

→ Approach when nobody is home

→ Enter through a rear window

→ Disable an alarm

→ Take specific items

Those actions form part of the person's method.

But methods can change.

If an alarm system is upgraded, for example, an offender may find another way to gain entry.

🎭 Signature: Something More Personal

A behavioural signature refers to behaviour that goes beyond what is necessary to complete the crime and may reflect something personally meaningful to the offender.

Unlike the practical steps needed to commit an offence, signature behaviour is not simply about getting the job done.

Think of the difference:

It might involve:

🔧 Method • 🚪 Entry • 🎯 Target choice • 🔄 Repeated behaviour • 🎭 Personal elements

🔎 LOOK CLOSER

Not every repeated behaviour is a signature.

If an offender wears gloves to avoid leaving fingerprints, that's a practical part of their MO.

If they repeatedly engage in an unnecessary behaviour that serves no obvious practical purpose, investigators may consider whether it could represent signature behaviour.

👉 ROOKIE TIP

Ask two questions:

“Did they need to do this to commit the crime?”

and

“Could this behaviour tell us something beyond the practical method?”

⚠️ REMEMBER

MO and signature are not interchangeable.

MO is about how the crime is carried out.

Signature refers to behaviour that may go beyond what is necessary to commit the offence.

Neither one automatically identifies an offender.

🧠 Think About It

An offender repeatedly disables security cameras before entering a building.

In another offence, they leave a distinctive object behind that serves no obvious practical purpose.

Which behaviour is more likely to be part of the MO, and which might investigators examine as possible signature behaviour?

Think about your answer before revealing the explanation.

🧩 Rookie Recruit Takeaway

MO is the method.

Signature is behaviour that may go beyond the method.

Both can provide investigators with useful information when examining offences and behavioural patterns.

How they did it isn't always the whole story.

Coming Up Next ➡️

Behaviour can provide investigators with patterns to examine.

But can those patterns tell us who an offender is?

Next, we'll look at profiling and behavioural analysis and what they can and can't tell investigators.

Nextup:

Profiles & Behavioural Analysis

🧠 Can Behaviour Tell Us Who the Offender Is?

Investigators sometimes examine behaviour to understand more about an unknown offender.

What did they do?

How did they behave?

What might their actions suggest about the offence?

This is where offender profiling and behavioural analysis come into play.

But there is an important Rookie rule:

A profile is not a name.

From Behaviour to Possibilities

Imagine an offender repeatedly targets isolated businesses late at night.

They appear to know how the security systems work and avoid areas with cameras.

Investigators might examine those behaviours and ask what they could suggest about the offender.

Perhaps they have:

• knowledge of the locations

• experience with security systems

• a reason for choosing particular times

• access to transport

• a preference for certain environments

These are possibilities to investigate, not facts about the person.

📖 Key Word - Offender Profiling

Offender profiling is an approach that uses information about an offence and the offender's behaviour to develop possible characteristics or investigative hypotheses about an unknown offender.

A profile might consider:

Profiling Isn't a Crystal Ball

A behavioural profile might suggest that an offender could have particular characteristics.

It cannot reliably tell investigators:

“This is the person who committed the crime.”

Many different people can behave in similar ways.

And offenders don't always behave consistently.

🔎 LOOK CLOSER

A profile can be useful because it helps investigators think about possibilities.

But a possibility needs to be tested.

If evidence doesn't support the profile, the evidence wins.

👉 ROOKIE TIP

Treat a profile as a lead, not a verdict.

Behavioural Analysis

Behavioural analysis can involve examining the actions surrounding an offence and considering what those actions may reveal.

Investigators might look at:

What happened?

What was necessary?

What wasn't necessary?

What was repeated?

What changed?

The aim is to understand behaviour and generate useful investigative questions.

⚠️ REMEMBER

A behavioural profile describes possibilities, not certainties.

It should never be treated as proof that a particular person committed a crime simply because they match a description.

🧠 Think About It

A profile suggests an unknown offender may have experience with a particular type of workplace.

Investigators later identify someone who fits that description.

Does matching the profile prove they are the offender?

🧩 Rookie Recruit Takeaway

Behavioural analysis and profiling can help investigators develop ideas, patterns and investigative leads.

But they cannot replace evidence or identify a guilty person simply because they fit a profile.

A profile can point. Evidence must support.

Coming Up Next ➡️

We've followed a suspect from the first investigative connection through motive, behaviour, MO and profiling.

Now we reach one of the most important distinctions in the entire section:

What is the difference between suspicion and evidence?

Nextup:

Evidence vs Suspicion ...

⚖️ Suspicious Isn't the Same as Guilty

Imagine police are investigating a burglary.

A person was seen near the building.

They knew the owner.

They had access to the area.

That might make investigators interested in them.

But none of those facts, by themselves, proves they committed the burglary.

This is where investigators need to separate what makes someone suspicious from what the evidence actually establishes.

Suspicion Can Start an Investigation

Suspicion isn't necessarily a bad thing.

It can help investigators decide where to look next.

A person's behaviour, relationship with the victim, opportunity or other information may raise questions.

But once those questions are raised, investigators need to test them against the evidence.

Suspicion might come from:

👀 Unusual behaviour • 🕐 Opportunity • 👥 Relationships • 📍 Location • 🔎 Investigative leads

📖 Key Word - Suspicion

Suspicion is a belief or feeling that someone may be involved in wrongdoing, based on information or circumstances.

Suspicion can guide an investigation, but it is not proof of guilt.

What Does the Evidence Actually Show?

Consider a simple example.

A suspect's fingerprints are found inside a house.

That's evidence that the person's fingerprints were present.

But investigators still need to ask:

Why were they there?

When were they there?

What else connects them to the burglary?

The evidence may be significant, but investigators must understand what it establishes and what it doesn't.

🔎 LOOK CLOSER

There's a dangerous trap investigators need to avoid:

Once someone looks suspicious, everything they do can start looking suspicious.

This can lead to information being interpreted in a way that supports the existing suspicion while ignoring information that doesn't.

Good investigation means being prepared to consider evidence that points away from a suspect too.

👉 ROOKIE TIP

Ask yourself:

“What evidence supports this idea?”

Then ask:

“What evidence could challenge it?”

🧩 The Evidence Has to Fit

Imagine investigators believe a suspect committed a robbery.

Then they discover CCTV showing that the suspect was somewhere else when the robbery occurred.

That's important.

The new evidence doesn't simply get ignored because investigators already have a theory.

It may mean the theory needs to change.

⚠️ REMEMBER

Suspicion can point. Evidence must support.

Being suspicious, having a motive or having an opportunity does not automatically make someone guilty.

🧠 Think About It

A suspect had a motive, knew the victim and was in the area when a crime occurred.

Later, investigators find evidence showing the suspect was somewhere else at the exact time of the offence.

Which information should investigators consider?

🧩 Rookie Recruit Takeaway

Suspicion can help investigators decide where to look.

Evidence helps investigators establish what happened.

The difference matters because a person can look suspicious and still be innocent.

Follow the evidence EVEN when it changes the story.

Coming Up Next ➡️

You've followed the suspect from the first connection through motive, behaviour, profiling and the difference between suspicion and evidence.

Now it's time to put those skills together.

Nextup:

ACTIVITY - Track Down the Case ...

Summary:

Put your investigation skills to work. Use the clues provided and CrimeTrakr's Global Search to identify the real Case File behind the investigation.

Instructions:

Read the scenario carefully and identify the key details that could help you find the case.

Use CrimeTrakr Global Search and select Keywords to search the available metadata. You can try different keywords from the list provided.

Once you think you have identified the case, record your answer and check it against the answer below.

Scenario

A woman in the United States repeatedly became seriously ill over a period of about ten days before eventually dying in hospital.

Her husband was a dentist, and investigators discovered that he had secretly obtained several unusual substances. They also uncovered internet searches relating to lethal and difficult-to-detect methods of causing death.

During the investigation, detectives discovered that the husband had increased his wife's life insurance while she was ill. They also learned that he was having an extramarital affair.

Investigators later uncovered evidence that he had attempted to create a false explanation for his wife's death.

Which CrimeTrakr Case File are we talking about?

Possible Keywords / Search Terms:

Try different keywords from the list below to track down the case.

Not every keyword will produce the same results, so think about which clues might be most useful.

• Dentist

• Financial Gain

• Colorado

• Poisoning

• Domestic Violence