Chapter 292 Crime Encyclopedia

Chapter 292 Crime Encyclopedia

Buried something?

In the Criminal Investigation Detachment Office, He Song and Hu Daqiang were both startled, and their eyes fell on Lin Chuan involuntarily.

Lin Chuan shook his head: "To be precise, there is a small layer in the middle. If it is completely buried in the soil, it cannot achieve the purpose of sound transmission. Even if there is sound, the ripples are not stable enough."

He Song was the first to raise questions:

"Xiao Lin, your guess is very reasonable and well-founded, but I want to ask, we have tested it up and down, and just used a detector to detect it. There is no metal reaction and no current. Even if there is a small layer in it, how can it transmit the sound?"

This question also stumped the two criminal police.

This is an area they rarely come into contact with.

Except for some difficult unsolved cases, many cases only need to collect on-site evidence, determine the motive for the crime, and then conduct criminal suspect inquiries, alibis, and monitoring. Finally, comprehensive materials are judged to roughly determine the suspect.

If it is not the only suspect, they will be cracked one by one.

It is not a difficult task.

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

But even Hu Daqiang has never understood what eavesdropping devices and sound transmission are, which is completely a 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 looked at each other and shook their heads.

Lin Chuan explained directly: "This is an extremely special eavesdropping device, which was once called 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 current."

"Then what is its working principle?" Shen Qianqian asked curiously.

"You have never been... cough!"

Lin Chuan paused, coughed lightly, and almost let it slip.

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

Shen Qianqian pursed her lips slightly and nodded slightly.

This is the truth.

In her heart, she complained, you are the only agent I have contacted!

But now is not the time to joke, so she gave Lin Chuan enough face, acted as a supporting role, and let Lin Chuan continue to popularize science.

Lin Chuan is indeed a professional agent.

He knows everything about eavesdropping devices.

In the eyes of the three people seeking knowledge, he explained: "The working principle of the Golden Lip Eavesdropping Device is based on the reception and conversion of electromagnetic waves. When radio waves are transmitted to the eavesdropping device, it will convert these microwave beams into electric current. When the 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."

"Next, the deformation of the film will change the capacitance between the film and the container, thereby changing the resonant frequency of the capacitor."

"Finally, this changing capacitor will generate an electric field between the disk and the cylinder, causing the electric potential of the cylinder to change, and it will be amplified and converted into an audible sound signal."

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

Lin Chuan explained in detail.

However, such a field is really their blind spot.

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

They couldn't understand it at all!

Lin Chuan's mouth twitched: "In layman's terms, when the radio electromagnetic waves from the outside world come in, 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 people seemed to understand, as if they had roughly understood.

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

Lin Chuan shook his head slightly and smiled: "Captain He, this is a product from a long time ago. The flower pots in the drug enforcement team may not be golden lip eavesdroppers, but may be other ones."

"I would like to hear more about it."

Now, He Song is like a student listening to a class, humbly asking the teacher for advice.

According to Lin Chuan's popular science just now, he feels that in the future, the anti-eavesdropping training of Anling Police Station can be asked to do Lin Chuan.

Highlight a profession!

Lin Chuan smiled and said, "The Golden Lip eavesdropper is a passive eavesdropper. 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 supply."

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

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

After hearing this, He Song suddenly realized.

He cursed again: "This gang of criminals, their methods 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 snake. They only need to determine the source of this batch of flower pots and the location of the receiving devices of these eavesdroppers. They can follow the clues and directly catch the mastermind behind the scenes.

However, with the level of the technical department of Anling Police Station, it is estimated that it will take a long time to determine the receiving device of the eavesdropper.

"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 your office wall."

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

So, Brother Lin already has a 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, then pointed at one of the people and asserted, "You are the murderer!"

Outrageous!

Very outrageous!

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

But Lin Chuan could do it.

After taking a look at the office area of ​​the anti-drug brigade, he 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, from the windowsill of your office, the balcony of the anti-drug office hall, and the corridor outside, you can see that those shops are just within the range of monitoring the transmission and reception of radio waves. I looked several times, and there was only one car parked next to the flower bed in front of the flower shop, and it didn't look like it was often driven."

Lin Chuan explained.

If nothing unexpected happens, the batch of potted plants was also bought from Wenxin Flower Shop.

It is also possible that they were sent by that shop.

"I'll make a call to confirm the source of the potted plants." He Song now has full confidence in Lin Chuan, and immediately took out his mobile phone and called a subordinate to confirm the source of the potted plants.

Everyone was listening nearby.

He Song did not shy away.

On the phone, he did not explicitly mention the potted plants, but only said that he liked the potted plants last time very much, and wanted to buy more, take them home to plant, cultivate his character, and decorate the house.

His subordinate replied on the phone: "Captain He, that store is just across the street behind us, and those potted plants were sent by him last time."

"Okay, I know, I'll go and see it when I have time."

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

Too strong!

Hu Daqiang winked at He Song, smiling: "Captain He, look, the person I recommended to you is not bad, right!"

He Song breathed a sigh of relief.

Now, the cause of the leak in the team has been basically determined, and the party that eavesdropped has been found, which is the Wenxin Flower Shop. We just need to collect evidence and verify it.

He Song believes that the result of the verification should be almost the same as Lin Chuan's speculation.

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

Now, the stone hanging in his heart is finally going to fall slowly.

He looked at Lin Chuan with a smile on his face, admiring him very much: "Brother Xiaolin, if it weren't for you, it is estimated that our drug enforcement team may not be able to find the source of the eavesdropping even if we investigate for another month. I thank you so much."

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

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

Lin Chuan raised his lips and looked at Shen Qianqian.

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

"You are really a busy man."

Captain He smiled.

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

Everyone looked at each other and laughed.

The office was suddenly filled with a happy atmosphere.

The haze surrounding He Songxin was also 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 with silver. At sunset, the sky is gradually stained with a touch of gentle orange-red. The oblique light falls, forming a warm-toned brushstroke, falling on the mountains, the river, and the urban area, a thin layer of golden light, 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 suburbs was also hidden in the dimness.

Shen Qianqian invited Lin Chuan to dinner, which was considered a celebration banquet for today.

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

At the dinner table.

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

He arrested Yu Qin, took notes, interrogated Yu Qin, and helped the anti-drug team to check for eavesdropping devices.

Well, it was a very fulfilling day.

But he was also hungry, and his stomach was rumbling.

As soon as the food was served, Lin Chuan was not polite and directly moved his chopsticks and picked up the food vigorously, which made Shen Qianqian laugh from ear to ear.

"Eat, don't just laugh."

Lin Chuan ate until he was three-quarters full before he spoke.

Shen Qianqian picked up a piece of beef for Lin Chuan with a public chopstick and smiled, "Eat it, otherwise when you go home, Xinxin will think I took you to work as a coolie."

"Isn't it?"

Lin Chuan asked back after picking up a mouthful of rice.

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

Lin Chuan stopped using his chopsticks and laughed, "You asked me a lot of questions today. Just answering them has consumed 80% of my energy. Isn't this labor?"

"I only asked a few questions." Shen Qianqian didn't pick up meat for Lin Chuan and pretended to be angry.

Lin Chuan laughed, "Your questions are very brain-consuming."

Shen Qianqian was angry and laughed, and said angrily, "Then I have to ask more questions. Who made you an encyclopedia of crime?"

"Stop it!"

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 slightly raised, and she said word by word: "Criminal Encyclopedia, is there any problem?"

"Why not?"

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

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

"Fortunately you are not wearing a police uniform, otherwise if you say I am the criminal encyclopedia, others will have to walk around me?" Lin Chuan laughed.

Shen Qianqian looked around, fortunately there were not many people.

She moved a little closer to Lin Chuan and laughed in a low voice: "To be honest, you are!"

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

"Just your performance today is indisputable evidence. Although it is my subjective speculation, I am not the only one who speculates so."

Shen Qianqian's eyebrows jumped and she smiled.

"Are there others who also speculate this?"

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

Shen Qianqian smiled, as if she had Lin Chuan under control: "Master Writer Lin, you don't know, Captain He and Captain Hu, they both asked me privately if you had ever done any work similar to that of a spy."