Bro, you are a policeman, not a thug.

Are there no clues?

No, there are clues!

An invisible person used some means to make three women commit suicide.

Don't talk about magical, terrible, or unknown means.

Any means are used by humans.

And they can never get out of the circle of "humans".

To make the three dead commit suicide, they must have communicated.

It's just that this communication was used by someone in some way and hidden.

But no matter how you hide it, it must have appeared around the three women.

This is the clue.

When the clue appears, no matter how cunning the criminal is, you will die in front of a group of police kings.

Without Xiao Mu's instructions, the seven police kings went to find it.

All the people, things, and objects that the three dead had contacted in the past were thoroughly checked.

Then, they found it!

"I found something strange, involved in the case."

Zhao Xiaotang handed over a mobile phone with investigation information on it.

Three base station tower investigation reports.

These three base stations are all near the homes of the dead, all inside and outside residential areas.

Nowadays, people know about mobile phone positioning, GPS functions, and satellite coverage.

But few people know that in addition to this positioning method, there is another simple positioning method.

Base station positioning!

Although the accuracy of this positioning is generally between tens of meters and hundreds of meters, it is not as accurate as GPS positioning.

But as long as you are in this range, you will be locked using a mobile phone to connect to the base station.

For example, there was once a fool who deliberately used his mobile phone to call 110 to report a false alarm.

He thought that if he turned on the flight, turned off the phone, and removed the card, the police would not be able to find him?

But he didn't know that his location was exposed through the signal base station.

Just check it, you can roughly lock his location.

This is also why some people don't report their location when calling the police, and the police can find you!

What Zhao Xiaotang and his team found was the location of the three dead, and there was an abnormality.

The location of the three dead was located, and there was traffic usage of three mobile phone cards.

It was found that the three cards were all processed using the identity information of people from other provinces and cities.

It was found that whenever the three dead returned home, the traffic information of the three cards would inevitably appear.

The same location, abnormal traffic card, all generated traffic after the three dead returned home.

After the three victims committed suicide, the traffic information of the three cards never appeared again...

Why do you want to check these now?

Don't look at the problem from a God's perspective, we are all human.

Who would think of investigating this before discovering the abnormality of this case?

So, is it a coincidence?

Don't talk nonsense, we are all a group of old criminal investigators.

It can be inferred that some electronic devices appeared around the three victims.

For example, three mobile phones, computers, tablets and other devices.

If the reasoning is valid.

Three devices disappeared after the three suicides.

Or.

Before the three suicides, they were "destroyed"!

Xiao Mu said coldly, "What did the three victims do?"

Zhao Xiaotang had a strange expression, "Probably...dark web."

Xiao Mu's expression froze.

Dark web, it is uncertain, but it is definitely similar to dark web technology.

For example, some companies have dedicated secure chat tools to keep information confidential.

Secrecy technologies and methods similar to dark web have long been raging on the street.

Only ordinary people will use certain social software, there is no secret at all.

Xiao Mu had a headache, "Can our technicians do it? Should we use them..."

"Don't do that."

Zhao Xiaotang was happy, "It will make us look stupid if we always bother the National Security Bureau. It's too embarrassing!"

Xiao Mu was happy.

As long as we are human, we all want to save face.

Brother, you are going down a narrow path!

Soon, someone else found something unusual.

This is how to solve a case. Find the right path and clues will appear one after another.

A mobile phone was placed in front of Xiao Mu.

Someone picked it up in one of the three suicide cases in the community involved.

And it was picked up on the day when a certain deceased committed suicide. Isn't it a coincidence?

The technicians began to check the phone and found no SIM card.

But they found a software tool in the phone.

The software can realize functions such as video calls and text chats.

A dark web tool.

Confirmed, it is most likely a secret phone of a certain deceased!

It can't be tracked here.

Because the software is invalid, it can't be connected.

It doesn't matter, the clues are not broken.

How did the phone appear in the hands of the deceased?

It can't just appear out of thin air, right?

After investigation, new clues were found.

The deceased's colleague had seen this phone before.

At that time, the colleague saw the deceased taking out a phone and a SIM card from a courier.

Locked the courier company and courier route of the day...

Three months ago, this city, a courier station!

Xiao Mu was standing outside the courier station, looking at a monitoring device inside the courier station, "Can the monitoring from three months ago still be checked?"

"We need to see how many layers of loop coverage there are."

A technician smiled bitterly, "More than three data overwrites, it is basically impossible to recover."

As mentioned in the previous article, storage hardware such as memory cards or hard disks.

It doesn't matter if you format this thing, it will still be restored to you.

The most feared thing is data overwrite.

Civilian surveillance is used in a loop, and all kinds of data are overwritten.

Monitoring from three months ago, basically don't even think about it!

Xiao Mu looked around.

Seeing a city Skynet surveillance camera in the distance, his eyes lit up.

Skynet surveillance has a large storage capacity and a long storage time.

Three months of data coverage.

No more than three times at most!

Four hours later.

A surveillance video recording was restored.

Three months ago, one afternoon.

A man wearing a baseball cap and a mask entered the express delivery station.

The package in his hand was identified as the express delivery containing mobile phones and phone cards that the deceased received on the same day.

Checked here.

Xiao Mu, Zhao Xiaotang and others let out a long breath.

Perhaps in other fields, the police may be rookies.

But in the area of ​​finding people.

They are not laughing at anyone: everyone here is a loser!

Once the target is locked, all kinds of criminal investigation methods will come.

At this time, Xiao Mu, who was in a soy sauce state, watched the seven police kings perform.

That was really awesome!

It only took five hours for a personal file to be placed in front of Xiao Mu.

Du Bo, male, 28 years old, from Xuecheng, unemployed...

...

Xuecheng, a business building on the third floor, a fitness club.

A young man was playing a butterfly machine.

Suddenly.

A tall figure stood in front of him.

Du Bo was stunned and looked up.

A handsome boy was looking at him.

"What's the matter?" Du Bo was surprised.

"Three months ago, you went to the express station to mail a package?"

Xiao Mu said calmly.

Hearing this, Du Bo's face turned pale and his eyes were full of panic.

As if he heard something terrible.

Suddenly.

Du Bo quickly stood up and wanted to escape.

But before he took a step.

A palm reached out and grabbed the back of his neck.

It was like picking up a dog and walking out of the club!