Solving the case is a little bitter, but my sister is super sweet

The file records that the murderer did not leave any traces.

What footprints does Lin Xuan need to find?

In 2021, a forensic doctor invented something.

Footprint revealer!

Its main function is to make some special footprints visible.

For example, someone wears shoe covers to enter the scene.

It seems that no footprints or shoe prints will be left.

But the problem is that geese leave their voices and people leave their traces.

How could there be no traces?

Many people have had such experiences.

Some people go out with their families and have not returned home for several days.

When they return home, they find that the floor is dirty and dusty.

The doors and windows were clearly closed before leaving, why is this happening?

Air circulation!

It is impossible for human habitation to be completely closed.

If the air does not flow, people will suffocate due to lack of oxygen.

The process of air circulation will bring some dust, particles, lint, dust, bacteria and organisms into the house.

In a short period of time, it is difficult for the human eye to see.

But after a long time.

If it is not cleaned for a long time, it will be clearly visible.

But whether it is cleaned or not, every day, every hour, every second.

The air in the room is circulating, which will bring some traces into the room.

Most of these dust particles and other things will fall to the ground.

Even if it is invisible to the naked eye, it exists.

Anything that touches it will be squeezed, attached, or even taken away.

For example, when human feet step on it, it seems that no trace is left.

In fact, the soles of the feet have taken these things away from their original positions.

Although the human eye and magnifying glass cannot see this situation.

But it does not mean that it does not exist!

The "footprint revealer" was invented specifically for this situation.

But something that was invented in 2021 is now 2016.

Can Lin Xuan make it?

Yes!

Because making the "footprint revealer" is very simple.

As simple as... aged vinegar, soap powder, detergent, and water.

After mixing, let it stand for ten minutes and put it into a spray bottle.

Use a spray bottle to spray the "footprint revealer" on the scene.

It can reveal traces that ordinary people cannot see!

Many things that are invented are surprising and magical to people at first.

When people understand the principles of these things, they will feel.

That's it?

...

Outside the residential building.

The master and the apprentice sat on the flower bed and smoked.

Zhao Qiang brought Lin Xuan here this time, but he didn't expect his apprentice to solve the case.

He just brought his apprentice here to gain experience and learn to investigate the scene.

This is also what Lin Xuan got with his "genius".

Otherwise, do you really think that during the probation period of the police cadets, you can investigate, analyze and participate in cases with your predecessors all day long?

You don't deserve it!

The most real situation.

The probation period of the police cadets is like doing odd jobs, sometimes even worse than the auxiliary police.

Serving tea and water, cleaning, learning various rules every day...

The master and the predecessors recognize you and think you are the material.

Only then will they take you, impart experience, and lead you to familiarize yourself with the work of criminal police.

Lin Xuan's performance is a bit too perfect.

It was so perfect that Zhao Qiang had an illusion.

He felt that this little guy was like an old criminal detective.

He was smart, studious, and had strong reasoning ability.

Who wouldn't like such an apprentice?

After smoking, Zhao Qiang was about to lead his apprentice back to the brigade.

"Master, when I was in the police academy, I was bored with my classmates and tinkered with something that could make footprints appear."

Lin Xuan threw down the cigarette butt and said to the master with a smile.

Zhao Qiang: ...

What do you mean?

And what is this thing that makes footprints appear that you are talking about?

Lin Xuan knew it very well.

Even if you can make a footprint revealer, no one will let you use it.

That was a murder scene involving three lives.

Anyone who dares to destroy this scene even a little bit will be held responsible.

Do you really think that reality is a movie, and the protagonist can act recklessly at the crime scene in order to show off?

Anyone who knows a little about criminal investigation knows how stupid this plot is!

Lin Xuan didn't explain anything.

He led his master to rent a daily rental house.

Start mixing the footprint revealer according to the proportion.

After it was made.

Lin Xuan asked the master to wear shoe covers and walk in the room.

Then, he took the spray bottle.

Sprayed in the room.

A scene that shocked Zhao Qiang appeared.

On the floor, "footprints" appeared one by one.

It's not that the places he stepped on were revealed.

It's that countless small bubbles appeared around the footprints he just stepped on.

After these bubbles appeared, they were like molds.

The footprints were in the bubble mold.

This is the role of the footprint revealer!

Some things will be taken away where human feet step.

The function of the footprint revealer is to make the dust, particles, hair, dust, bacteria and organisms around the footprints react.

The footprints will also appear naturally!

"Fuck!"

Zhao Qiang came back to his senses and took a deep breath.

As we all know.

The word "fuck" is an interjection used by humans to express shock.

Zhao Qiang also fully demonstrated the qualities that a "shock party" should have.

"Did you really come up with this thing in the police academy?"

"Yes."

Lin Xuan spoke nonsense in a serious tone.

Otherwise, how can you explain that you are a reborn person?

"Boy, you've done a great job!"

Zhao Qiang had a complicated expression on his face and patted his apprentice on the shoulder.

Take out your cell phone and call the captain.

About ten minutes.

Xiang Yunpeng, the captain of the Criminal Investigation Brigade, came to the two men.

He is tall, has thick eyebrows, big eyes, and dark skin.

A pair of bright black eyes flashed sharply from time to time.

When Lin Xuan 'performed' the footprint revealing agent for him again.

Xiang Yunpeng was also shocked, and then became ecstatic.

Soon, this ecstasy turned to helplessness, "The site cannot be destroyed, and the people above will probably not let it be used."

Lin Xuan and Zhao Qiang looked at each other and said nothing.

"Ask first."

Xiang Yunpeng took out his mobile phone and called the detachment.

The superior leaders were very surprised when they heard about the ‘footprint revealing agent’.

Tell them to stay where they are and come over immediately.

The result was twenty minutes.

A group of leaders came, several wearing white shirts.

what's the situation?

The situation is that this murder is too big.

The leaders of the corps went to the detachment task force to inspect in person today.

I learned that the people below had created a 'footprint revealing agent'.

Come and take a look out of curiosity.

However, when Lin Xuan saw the white shirt walking in the front.

Senseless.

The second-level police officer in white shirt also froze in place when he saw Lin Xuan.

After all, he is someone who has seen strong winds and waves.

He was also the deputy captain of the corps and reacted quickly.

He nodded to Lin Xuan with a smile on his face.

Lin Xuan:......

How could it be such a coincidence?

I remember that in the last kidnapping case, he spent 2 billion to dig a hole in an apartment.

Catch the kidnappers.

After the arrest was successful, a team in a white shirt came.

That's right, it's the deputy captain.

Lin Xuan's expression suddenly became wonderful.

No, I should say: It’s so embarrassing!