I asked you to write a book, not to disclose your criminal record!

Chapter 292 Crime Encyclopedia
Buried something?

In the Criminal Investigation Brigade office, He Song and Hu Daqiang were both stunned, and their eyes involuntarily fell on Lin Chuan.

Lin Chuan shook his head: "To be precise, there is a small space in the middle. If it is completely buried in the soil, it will not be able to transmit sound. Even if there is sound, the ripples will not be stable enough."

He Song was the first to raise the question:
"Xiao Lin, your guess is very reasonable and well-founded. However, I want to ask, we have checked it up and down, and just now we used a detector to detect it, and there is no metal reaction, and there is no current. Even if there is a small layer of air inside, how can it transmit the sound?"

This question also stumped the two detectives.

This is an area they rarely touch upon.

Except for some difficult unsolved cases, in many cases, it is only necessary to collect evidence from the scene, determine the motive for the crime, and then question the suspect, obtain alibi, check surveillance, and finally make a judgment based on the comprehensive materials to roughly identify the suspect.

If he is not the only suspect, then attack them one by one.

It's not that difficult.

They have experience in on-site investigation and investigation, and are all veteran and excellent criminal police.

But even Hu Daqiang had no knowledge of eavesdropping devices or sound transmission. He had a complete blind spot in knowledge.

Lin Chuan looked at the reactions of the three people and smiled: "Have you heard of the Golden Lip Eavesdropping Device?"

The three of them looked at each other and shook their heads.

Lin Chuan explained directly: "This is an extremely special eavesdropping device, once known as the king of eavesdropping devices. It only needs an antenna, a small cylinder, a very thin diaphragm, and a shell to achieve the purpose of eavesdropping. The key is that it does not require electric current."

"So how does it work?" Shen Qianqian asked curiously.

"You've never been... cough!"

Lin Chuan paused, coughed lightly, and almost let the cat out of the bag.

Then, he took a sip of tea and said, "You have never come into contact with agents, or you have not dealt with them much, so you don't know much about various types of eavesdropping devices."

Shen Qianqian pursed her lips and nodded slightly.

This is the truth.

But she thought to herself, you are the only agent I have ever met!
But now was not the time to joke, so she gave Lin Chuan enough face and acted as a supporting actor, allowing Lin Chuan to continue his popular science lecture.

Lin Chuan is indeed a professional agent.

He knows everything about eavesdropping devices.

As the three people looked at him inquiringly, he explained, "The working principle of the Golden Lips eavesdropping device is based on the reception and conversion of electromagnetic waves. When radio waves are transmitted to the eavesdropping device, it converts these microwave beams into electric current. When the electric current is transmitted to the film, it will change with the vibration of the sound waves, and the shape of the film will also change."

"Then, the deformation of the membrane changes the capacitance between the membrane and the container, which changes the resonant frequency of the capacitor."

"Ultimately, this changing capacitor generates an electric field between the disk and the cylinder, causing the cylinder's electric potential to change, which is amplified and converted into an audible sound signal."

"In this way, the sound signal can be received by a special receiving device."

Lin Chuan explained in great detail.

However, this area is really their blind spot.

The three people had stunned and confused expressions on their faces.

I don’t understand it at all!
Lin Chuan's mouth twitched: "In layman's terms, when the radio electromagnetic waves from the outside world are transmitted, it starts to work, and through a series of means, it is converted into sound signals, and then received by special receiving equipment to achieve the purpose of eavesdropping."

The three of them seemed to understand, but not quite, as if they had roughly understood it.

He Song nodded: "I didn't expect that such a high-tech product has been used."

Lin Chuan shook his head slightly and said with a smile: "Captain He, this is a product from a long time ago. The flower pots in the drug enforcement team may not contain the Golden Lip eavesdropping device, it may be something else."

"Appreciate further details."

Now, He Song is like a student listening to a lecture, humbly asking questions from the teacher.

According to Lin Chuan's brief scientific lecture, he felt that in the future, Anling Police Station could ask Lin Chuan to do the anti-wiretapping training.

Highlight a major!
Lin Chuan smiled and said, "The Golden Lip eavesdropping device is a passive eavesdropping device. It mainly relies on electromagnetic waves or other external energy sources in the environment to work, and does not require internal batteries or external power supplies."

"For example, radio frequency eavesdroppers can use mobile phone signals and wifi signals to collect energy and drive the eavesdroppers to work."

"After you dismantle the flower pot, you can ask the criminal investigation technicians to determine what type of bug it is."

After hearing this, He Song suddenly understood.

He cursed again: "These criminals are so cunning."

Lin Chuan smiled.

The subsequent things are much simpler.

The anti-drug team does not need to rush to dismantle the flower pots to avoid alerting the suspects. They only need to determine the source of the flower pots and the location of the receiving devices of the eavesdropping devices. Then they can follow the clues and directly catch the mastermind behind the scenes.

However, given the level of the Anling Police Station's technical department, it would probably take a long time to identify the receiving device of the eavesdropping device.

"Brother Xiaolin."

At this time, He Song had a smile on his face and poured a cup of tea for Lin Chuan.

Lin Chuan knew exactly what He Song meant, so he said directly: "Captain He, go check out the cozy flower shop on the street outside the wall of your office."

He Song's smile froze on his face before it faded away.

So, Brother Kobayashi already has someone to suspect?

Shen Qianqian and Hu Daqiang were also stunned.

Lin Chuan's expression was no less than that of someone who had just looked at the crime scene, pointed at one of the people, and declared, "You are the murderer!"

Outrageous!

Very outrageous!

Even if a great detective came, it would be impossible for him to solve the case so quickly.

But Lin Chuan can do it.

After taking a look at the office area of ​​the Anti-Drug Brigade, they determined that the flower shop at the other end of the street facing the window was the suspect in this wiretapping case.

He Song swallowed his saliva and asked, "Brother Lin, how did you judge it?"

"That street can be seen from the windowsill of your office, the balcony of the anti-drug office hall, and the corridor outside. Those shops are right in the range of monitoring the transmission and reception of radio waves. I looked several times and only one car was parked next to the flower bed in front of the flower shop. It doesn't look like it is often used."

Lin Chuan explained.

If nothing goes wrong, that batch of potted plants was also purchased from the Wenxin Flower Shop.

It is also possible that it was given by that store.

"I'll make a call to confirm the source of the potted plants." He Song now had complete faith in Lin Chuan. He immediately took out his cell phone and called a subordinate to confirm the source of the potted plants.

Everyone was listening nearby.

He Song did not shy away from the question. On the phone, he did not mention the potted plants explicitly, but only said that he liked the potted plants he bought last time very much and wanted to buy more, plant them at home, cultivate his character, and decorate his house at the same time.

His subordinate replied on the phone: "Captain He, that store is just across the street behind us. He was the one who sent us those potted plants last time."

"Okay, I got it. I'll go check it out when I have time."

He Song hung up the phone, his eyes fell on Lin Chuan, and his thumb raised involuntarily.

too strong!
Hu Daqiang winked at He Song and said with a big smile: "Captain He, look, the person I recommended to you is pretty good, isn't he!"

He Song breathed a long sigh of relief.

Now, the reason for the leak within the team has been basically determined, and the party that eavesdropped has been found, which is that cozy flower shop. We just need to collect evidence and verify it.

He Song believed that the verification results should be similar to Lin Chuan's speculation.

For this matter, he was criticized a lot and blamed himself a lot.

Now, the stone hanging in my heart is finally slowly falling to the ground.

He looked at Lin Chuan with a smile on his face, and he admired him very much: "Brother Xiao Lin, if it weren't for you, I guess our drug enforcement team might not be able to find the source of the wiretapping even if we investigate for another month. I am so grateful to you."

Lin Chuan waved his hand and said modestly: "It's just a small favor."

"Xiao Lin, it's getting dark and almost time for dinner. Why don't we have dinner together?" He Song invited enthusiastically.

Lin Chuan raised the corner of his mouth slightly and looked up at Shen Qianqian.

Shen Qianqian immediately said, "Captain He, Lin Chuan has an appointment tonight."

"What a busy man."

Captain He smiled.

Lin Chuan raised his eyebrows: "Captain He, how about tomorrow, tomorrow night's dinner, I haven't arranged the schedule yet."

Everyone looked at each other and laughed.

The office was suddenly filled with a happy atmosphere.

The haze surrounding He Songxin was swept away in an instant.

When Lin Chuan walked out of the police station.

It was already evening.

The winter in the south is not covered in snow. At sunset, the sky is gradually dyed with a gentle orange-red. The slanting light falls, forming a warm-toned brushstroke, falling on the mountains, rivers, and urban areas. A thin layer of golden glow is very delicate, adding a bit of gentleness and tranquility.

In winter, the days are short and the nights are long.

After a while, they stepped into the night, and the curling smoke from the kitchens in the suburbs was also hidden in the darkness.

Shen Qianqian invited Lin Chuan to dinner as a celebration party for today.

——Yu Qin was successfully arrested and brought to justice.

The dinner table.

Shen Qianqian ordered all of Lin Chuan's favorite dishes. Lin Chuan drank a lot of tea that day and was busy all the time, so he was almost starving.

They arrested Yu Qin, took a statement, interrogated Yu Qin, and also helped the anti-drug team to check for eavesdropping devices.

Well, a very fulfilling day.

But I was also hungry and my stomach was rumbling.

As soon as the food was served, Lin Chuan didn't hesitate to pick up his chopsticks and started eating vigorously, which made Shen Qianqian laugh so hard.

"Eat, don't just laugh."

Lin Chuan ate until he was about three-quarters full before he started talking.

Shen Qianqian picked up a piece of beef for Lin Chuan with a serving chopstick and said with a smile: "Eat it, or when you get home, Xinxin will think I've forced you to do hard labor."

"Is not it?"

Lin Chuan took a mouthful of rice and asked back.

"How could I treat you as a coolie?" Shen Qianqian hummed softly.

Lin Chuan stopped using his chopsticks and smiled, "You asked so many questions today, and I have already used up 80% of my energy just answering them. Isn't this just hard labor?"

"I just asked a few questions." Shen Qianqian stopped picking up meat for Lin Chuan and pretended to be angry.

Lin Chuan laughed: "Those questions of yours are very brain-consuming."

Shen Qianqian was angry and amused, and said angrily: "Then I have to ask, who made you an encyclopedia of crime?"

"Stop!"

Lin Chuan turned around and took a sip of orange juice.

"What's wrong?" Shen Qianqian asked.

"What did you say just now? What encyclopedia?" Lin Chuan asked.

In the restaurant, under the bright lights.

Shen Qianqian's pretty face raised slightly, and she said word by word: "Criminal Encyclopedia, any questions?"

"Why is there no problem?"

Lin Chuan pretended to look stern and looked at Shen Qianqian again. She was now wearing casual clothes, a light grey sweater and jeans. She looked very energetic and, of course, very beautiful.

"Why are you looking at me like that?" Shen Qianqian asked back.

"Fortunately you are not wearing a police uniform, otherwise you would say that I am the encyclopedia of crime and people would have to avoid me, right?" Lin Chuan laughed.

Shen Qianqian looked around and luckily there weren't many people around.

Then he moved a little closer to Lin Chuan and said with a low laugh: "To be honest, you are it!"

"You'd better produce evidence, otherwise I'll sue you for defamation, defamation!" Lin Chuan said seriously.

"Just your performance today is indisputable evidence. Although this is my subjective speculation, I am not the only one who makes this assumption."

Shen Qianqian's eyebrows jumped and she smiled.

"Anyone else speculates the same thing?"

Lin Chuan frowned slightly. This is not a good sign!

Shen Qianqian was all smiles, as if she had Lin Chuan in her grasp: "Master Writer Lin, you may not know this, but Captain He and Captain Hu even asked me privately if you have ever done any work similar to that of a spy."

(End of this chapter)