Chapter 540 Key Evidence (Please Vote for This Big Chapter!)

In fact, when Chen Yan tapped with his fingers and turned on the auditory gene lock, it was easy to hear whether there were hollow drums under the tiles.

It's just that if you find something like a steel bar and hit it, the sound will be easier to distinguish, and Liu Qingshan's ordinary hearing level can also hear it.

After a while, Liu Qingshan turned back and handed Chen Yan a short steel bar in his hand. He still had one piece left in his hand.

The bathroom was not big, and the two of them faced two walls, and they began to distinguish each other after knocking.

"Chen Yan, something seems wrong here."

There were two bricks in the middle of the south wall that Liu Qingshan was responsible for knocking, and there was a thumping sound.

Chen Yan also heard it clearly, but just two bricks...

This range is a bit small: "It is very likely that the mortar inside the tile is empty. Pry it open and take a look."

"good!"

Liu Qingshan was not sure if there was something inside, or if it was simply the sound of the mortar hollowing out, but he would know as long as he opened it and took a look.

Snapped!

The steel bars were struck hard, and the tiles cracked. Liu Qingshan stepped forward to take a closer look. There was a cement wall behind the tiles.

His face darkened, Liu Qingshan looked at Chen Yan: "The mortar is gone."

"It's okay, let's try somewhere else."

The two people knocked down the tiles from the top of the bathroom one by one, and found that after breaking open the 7 hollow bricks, they were filled with cement walls. They were all caused by the empty mortar and there was no hidden space.

Ten minutes later, all the tiles had been knocked, but still nothing was found.

Chen Yan also frowned slightly at this moment: "Where else can I hide it?"

The bathroom in the rental house was a squat toilet. Chen Yan stood on the countertop of the squat toilet and searched the entire bathroom again.

At this moment, Chen Yan had opened the visual gene lock and carefully scanned every detail.

However, after five minutes, Chen Yan still had no results.

The tiles on the wall are perfectly seamless and there is no possibility of any hidden structure.

"Is it possible that he didn't put anything here at all?"

"Or have the things been destroyed?"

destroy?

Not here?

Chen Yan shook his head: "Wu Degui is different from ordinary murderers. He is a serial murderer who committed five consecutive murders."

"This kind of person's psychology is completely different from that of ordinary people."

Chen Yan pointed to the discs under the coffee table: "Look at the discs there, there are new ones released this year, and there are also old discs from more than ten years ago."

"But if you look at the order in which the discs are placed, some old discs are not at the bottom, and new discs are not at the top."

"And the disc playing in the DV player is also a previous TV series."

"Even some discs can be preserved for more than ten years. Wu Degui would destroy something that had been used to commit crimes?"

"As for finding another place to store it..."

Chen Yan still shook his head.

"Wu Degui committed a serial murder case. The things he used, the plans he planned, and even the tools for committing crimes must be kept by his side, where he can see them at all times."

As Chen Yan spoke, he walked out of the bathroom and looked around the entire living room.

"But, where is this place?"

That is, where can it be hidden?

The whole room is so big, a living room, a bedroom and a bathroom.

Liu Qingshan also followed Chen Yan out of the bathroom and followed Chen Yan's gaze as he glanced around.

Um?

Suddenly, Chen Yan paused slightly.

At this moment, Chen Yan happened to be in front of the sofa, facing the bathroom.

A place that can be seen all the time...

Chen Yan seemed to have captured some key information.

In the living room, the old sofa has a dent in the middle due to long-term use.

Chen Yan sat on it and could tell that this was where Wu Degui often sat.

Look up and see that there is a TV in the corner on the left.

The most comfortable position for watching TV from this angle is to lean on the sofa with your left hand on the edge of the sofa.

However, when Chen Yan sat up straight and looked straight, his eyes were facing the bathroom.

In simple rental houses, most bathrooms are equipped with squat toilets.

The installation of a squat toilet is different from that of a toilet.

In fact, whether it is a squat toilet or a toilet, except for the top, the internal structure is somewhat similar.

There is an S-shaped elbow at the water launch.

The S-shaped elbow of the toilet is inside the toilet. Because the toilet itself is 40 cm to 50 cm high, the elbow to prevent backflow can be accommodated inside the toilet.

However, squatting toilets don’t work.

Due to its structure, squat toilets must be installed at least 20 cm above the ground.

The reason for this is to leave enough space for the bent pipe of the squat toilet.

Therefore, from a space perspective, squatting toilets waste more space, but are cheaper to build.

Chen Yan stood up again and looked at the sofa.

This sofa is relatively small, with only two seats. Generally speaking, the sofa will be placed in the middle of the living room, which is in line with most people's aesthetic thinking.

However, the sofa in Wu Degui's house is placed a little to the left.

That is, near the window sill.

Wu Degui's room, after entering the door, is the bathroom at the back. In other words, the bathroom is close to the window sill.

What puzzled Chen Yan was, why didn't Wu Degui put the sofa in the middle?

It's on the left, and you can see the toilet when you look up.

This is not in line with the preferences of ordinary people.

Generally speaking, staying away from toilets is the right thing to do.

There is only a coffee table in Wu Degui's room and no dining table, which means that when he usually eats, he should most likely eat on the coffee table.

So Wu Degui looked up at the toilet as soon as he ate?

Isn't this a bit strange?

Chen Yan sat on the sofa and looked at the toilet...

The visual gene lock is on!

Um?

Soon, Chen Yan discovered something was wrong.

The color of the edge of a ceramic tile facing Chen Yan was slightly different from Zhou Wei's.

It seems smoother and more reflective!

Chen Yan immediately stood up, bent down, squatted at the door of the toilet, picked up the steel bar at hand, and gently tapped the floor tiles on the side of the squat toilet platform facing him.

Boom, boom, boom!

The hollow sound is crystal clear.

Chen Yan changed direction and knocked on other floor tiles.

Boom, boom, boom!

Still a hollow voice came.

Liu Qingshan naturally sensed that something was wrong, with a surprised expression on his face: "Is this place empty?!"

Gan!

Now that an exception is found, it is convenient to open it.

Chen Yan just gently pulled the edge of the floor tile that was facing him. With a little force, the entire floor tile was removed.

"Flashlight!"

Taking the flashlight handed over by Liu Qingshan, Chen Yan lay on the ground and shined inside.

At the same time, some pungent smell of blood came, as well as the familiar smell of Li Yansong.

Finally found!

Ten minutes later, everything inside the squat toilet platform was taken out.

A gray-blue labor protection suit, light gray jeans, and a pair of white sneakers.

In addition, Chen Yan and Liu Qingshan also found a box of probes and several meters of rubber tubes looped together.

In addition to these, there is a notebook.

Liu Qingshan immediately picked up the white sneakers and looked at the patterns below. They were exactly the same as the shoe prints extracted on the spot in his memory: "These are the shoes!"

Each pair of shoes has a different degree of wear and tear, and even if it is worn by the same person at different times, the shoe prints left behind are unique.

Therefore, in principle, as long as he has these shoes, the evidence that Wu Degui killed Li Yansong will be considered conclusive.

While Liu Qingshan was sorting out the clothes Wu Degui wore when he committed the murder, Chen Yan took the black leather notebook.

The black outer cover has the "Notebook" font engraved on it, and the corners have turned yellow, and the black cover also has some wear and tear.

In Chen Yan's memory, this style of notebook should have been produced more than ten or twenty years ago.

But judging from the curled corners and the worn parts, its owner had obviously been flipping through it frequently.

Open the notebook, and on the first title page, there is a beautiful hard-pen font.

Prize: Wu Degui won the title of Difficulty Trucking Pacesetter and was awarded a notebook as encouragement.

The signing unit was Shen City No. 1 Transportation Company, and the signing date was 2001.

This is……

Something from twenty years ago.

The background information about Wu Degui is being investigated, but there are no valuable clues.

At present, it is only known that Wu Degui's household registration is in Shenshi City, but no real estate has been found in his name.

There was no information that he was married, and the household registration information was relatively simple.

The people in this compound were not very familiar with Wu Degui, and they knew nothing about his past.

Shen City No. 1 Transportation Company...

It turns out that Wu Degui once worked at Shenshi No. 1 Transportation Company.

The First Transportation Company was established a long time ago, with a history of about seventy or eighty years. However, it went bankrupt twenty years ago due to changes in the economic development model.

The company was restructured into Shenshi Bus Transportation Group Company.

"Master, wait a minute and go to Shen City Public Transport Collective Company to check the archives of Shen City's No. 1 Transport Company. Wu Degui once worked for this company."

"Let's see if we can find anything."

"good!"

Liu Qingshan agreed and immediately arranged relevant work.

Chen Yan continued to look through the diary.

First page.

On Monday, the weather will be light rain.

"Lao Li got 1 yuan and 50 cents last month. He promised to give it to me today, but he didn't give it to me."

"Why did I lend him money at that time? Lao Li is famous for keeping money. I probably won't get the 1 yuan and 50 cents back."

"If it really doesn't work, tell him. But we are all colleagues. It would be bad to fall out because of 1 yuan and 50 cents."

"Forget it, I don't want the money, just puncture the rear tire of his bicycle."

Wednesday, the weather was sunny.

"Today at noon, I saw Qin Yu cooking at the entrance of the cafeteria again."

"Qin Yu is really good-looking. It's a pity that he follows that sycophant Zhang Huaiying."

"Isn't it just that he knows how to flatter the leader? He becomes a director, otherwise he is nothing."

"Qin Yu entered the factory at that time, but I helped her carry the luggage. I had a chance, but..."

Monday, the weather will be cloudy.

"Qin Yu and Zhang Huaiying divorced. I am very happy. I think I can have a drink."

"Although Qin Yu has become a widow, I don't dislike her."

"And in the past few years, Qin Yu has become more and more beautiful and plump."

"I'm going to give her a hairpin today. I bought it from a department store. She should like it, right?"

After receiving this diary reward from Wu Degui, Wu Degui will write down a diary entry every once in a while.

But there is no specific time record, only the day of the week and weather conditions.

Not only that, he didn't write diaries very frequently. After Chen Yan opened about 10 pages, it was already his last diary entry.

"Damn it, Zhang Huaiying actually made me laid off!"

"My feet are lame because of the factory, and you actually laid me off!"

"You are such a flatterer and your whole family will die. No wonder Qin Yu divorced you and married the factory director. You deserve it!"

"Zhang Huaiying, just wait. Sooner or later, you will fall into my hands. I will drain your blood and prevent you from reincarnation forever!"

The last time I checked my diary, there was no day of the week or weather conditions.

And the handwriting was much more sloppy than before, obviously written in anger.

After that, it's a blank page.

Chen Yan flipped through it casually and discovered that there was another record on the back of the diary.

Chen Yan turned the diary over, opened it and looked at it, his eyes focused.

It turned out that what was recorded behind the diary was Wu Degui's plan to kill the taxi driver.

The first taxi driver victim: Zhang Huaiying!

The diary records every detail of Wu Degui's murder.

Including when and where to do it, what to use to remove traces after doing it, how to remove it, how to check, etc.

Very detailed.

After that, there are five similar murder plans.

The final plan, on the first page, is the sketch of the Phoenix Street area.

A red line is drawn with a red pen on the road across the area.

There are also arrow marks. Liu Qingshan marked the route that Li Yansong's taxi took after entering the area during the report. It was very similar.

"Master, look at this."

Passing the notebook to Liu Qingshan, the latter looked at it and his eyes lit up: "Now I don't see how he can deny it!"

With the pair of white sneakers, it can be determined by comparing the shoe prints that Wu Degui killed Li Yansong.

But what about former taxi drivers?

So many years have passed, how can we find evidence?

And this diary confirmed that Wu Degui was the murderer of the serial murder case.

This involves the issue of closed-loop evidence for case detection.

Whether it is the patterns on his clothes or shoes, it can be proved that Wu Degui killed Li Yansong.

But the evidence of the four serial murders 15 years ago has long been found. So what if it is determined that Wu Degui is the serial murderer?

It is impossible to judge based on the modus operandi of the crime, and even if Wu Degui admits that he is a serial murderer, it is still impossible without evidence to support it.

Once there is no evidence, it cannot be strictly said that the serial murder case has been solved.

With this notebook and Wu Degui's murder plan, the evidence is complete.

trial room.

This time, Chen Yan and Wang Fenglei interrogated Wu Degui together.

Just now, all the evidence has been shown to Wang Fenglei.

Now, it can be said that the evidence is conclusive!

The clothes and shoes found under the squat toilet platform have been sent to the technical team for trace identification. Only the notebook was sealed in the evidence bag and placed on the interrogation table.

"Wu Degui, do you think we will never find what you have hidden?"

Clothes, shoes, notebooks, probes, rubber hoses and a bottle of ether spray.

These are all Wu Degui's tools for committing crimes.

At this moment, Wu Degui was shaking like chaff.

His eyes stared at the black notebook on the table in horror.

He seemed to be muttering unconsciously: "Impossible...impossible...how could you find it?"

"Wu Degui!"

Wang Fenglei roared angrily, which frightened Wu Degui: "Tell me, how did you kill five taxi drivers?"

"Zhang Huaiying laid you off. It can be said that you killed him to retaliate against him, but what about the other four people?"

"Why did you kill them!"

Wu Degui's information from that year has also been investigated clearly.

At that time, Wu Degui worked very actively at Shenshi No. 1 Transportation Company and basically got advanced grades every year.

But when he was 23 years old, while repairing a vehicle, his left foot was smashed by an engine and he became disabled.

In addition, this man was dull and introverted, so he never found a wife until he was laid off eighteen years ago.

Because of corruption and bribery, Zhang Huaiying lost his public office 15 years ago and started driving a taxi.

After Wu Degui learned about it, he planned to kill Zhang Huaiying.

This was the first serial murder of a taxi driver fifteen years ago.