Criminal Investigation Files

In the early morning of the third day of the incident, in the Nancheng Police Station, Song Wen's team worked overtime as usual. Everyone was waiting for the result of an experiment, which would determine the direction of the entire case.

For this result, Song Wen went to Cheng Xiaobing and confiscated a box of lava chocolates she bought. Xu Yao and other colleagues in the identification center have been busy since the afternoon, and even consulted the professor of the Department of Chemistry of Nancheng University, and recruited Nancheng Chemical Industry Co., Ltd. The factory's precision instruments are tested.

Lu Siyu was sitting at the desk, sorting out the documents, and was so sleepy that his eyes were about to close. In order to wake up, he got up and went to the bathroom, and went to the water dispenser outside to get a cup of hot water.

While he was going out, Fu Linjiang gave Lao Jia a push: "If it turns out that Lin Wanwan is the suspect later on, you should apologize to Xiao Lu."

Lao Jia touched his nose: "The result hasn't come out yet."

Fu Linjiang said: "You followed Guo Hua's line and ran back and forth for a day, but didn't find any relevant clues, so don't be stubborn."

Lao Jia had already had a hunch in his heart that he might be wrong, but as an old criminal policeman, he also wanted to save face. If he really wanted to apologize to a trainee policeman, he just felt that he couldn't let this face down.Seeing Lu Siyu come in, Fu Linjiang left Lao Jia's desk without urging him again.

Lu Siyu sat on the chair. He had just washed his face with cold water, and there were still some water droplets on his hair. He took out a tissue and wiped it off.

Song Wen came over and said kindly: "If you can't hold on, go back."

Lu Siyu raised his head and whispered, "Team Song, everyone else is working overtime." He didn't quite understand why Song Wen suddenly became sympathetic. Everyone is jealous.

Song Wen looked down at Lu Siyu, and the skin that had just been washed was so white that it was almost transparent: "They slept all night yesterday, and they didn't sort out the materials. Seriously, if you can't stand it, you can still go to the bureau Sit on the sofa in the office for a while."

Lu Siyu held the thermos in his hand and shook his head stubbornly: "Forget it, I guess the results will come out later, and I'm also curious about the truth."

While talking, Xu Yao walked in from the outside stepping on high heels, and then took out a stack of test materials from the bag: "Several chemical laboratories worked overnight, and the results finally came out."

When everyone heard the news, they gathered around.Song Wen took the test sheets, looked at the pile of numbers on them, and twitched the corner of his mouth slightly.Then he looked at Lu Siyu and said, "Come on, let me interrogate Lin Wanwan."

Lu Siyu followed him to his feet, and he instantly woke up, with a little excitement in his usual cold expression.

As soon as the door of the interrogation room opened, Lin Wanwan moved, turned from lying on her stomach to raising her head, and looked at Song Wen and Lu Siyu who walked in. This was already the second time she was locked in the interrogation room. God, she received special treatment the first night, and was locked up in a room with a bed to sleep for a while, but today she was locked up here for a day. The long-term torture made her look extraordinarily haggard, and she was also extremely emaciated. pitiful.

"Is the 48 hours coming soon? Or is it because Guo Wei is awake and you have checked it out? According to the regulations, you can only detain me for so long." Lin Wanwan was talking, as if she had already decided that she was the winner of this game .

Song Wen sat opposite her and said, "That means you are not a suspect."

Lin Wanwan hugged her arm: "Why do you suspect that I killed someone? I've said everything I need to say. The whole thing has nothing to do with me."

Song Wen leaned his back against the backrest, and looked at her with some indifference: "You also know that 48 hours is almost up, and there is no evidence, will I come here to see you?" Then he spoke in a low voice, as if addressing The girl in front of her pronounced the sentence: "We found the key evidence. It was you who wanted to use Guo Hua's hand to kill your classmate."

Lin Wanwan pursed her lips: "Officer, what you say must be based on evidence."

Song Wen squinted his eyes and said, "When did you start implementing your plan? When you discovered that those dog thieves often came to the pet shop? When you introduced Guo Wei to work? It was when you worked with those stray cats. Did you start when you tested the dose? Or did you deliberately provoke a war in the dormitory, and let Guo Wei buy chocolate, Dong Fang and Ma Ai Jingyan and start?"

Under the light of the interrogation room, Lin Wanwan's eyes were as clear as fine amber.She looked at the two people in front of her without refuting or interjecting. She was as cold as a piece of ice.

Song Wen continued: "You must be very curious, where did you let yourself go? I can restore the process of the crime. In order to facilitate the poisoning, you chose a kind of Internet celebrity lava chocolate this time. A box is just right Four, the outside of the chocolate has a layer of skin, and the inside is full of chocolate candy, which is convenient for the green gas to dissolve. That morning, you pretended to be kind and took the courier back when no one was around. In order not to leave fingerprints, you Wearing gloves, you injected poison into four chocolates, and in order not to be suspected afterwards, you injected poison into each of them. But, because you were too afraid of death, you marked the one you chose , Only a relatively small amount of poison was injected into that chocolate ball."

"Those chocolates have been left to stand for a while, and when you eat them, the candy heart of each piece of chocolate is highly poisonous. In the evening, the three of them returned to the dormitory one after another. You are very familiar with each of them and know that they are I like to eat sweets, I don't know what kind of rhetoric you used, let Guo Hua hold the box, everyone shared the chocolate, you got the one prepared in advance, and then the three of them ate it unprepared."

Lin Wanwan pursed her lips and did not speak, Song Wen continued: "You know that the green gas compound is highly poisonous, and you are afraid that this chocolate will kill you, so even if you take the one with the smallest dose, you will still You didn't finish your share of chocolate, you hid the rest of the chocolate in a tissue, and after everyone washed up and went to bed, you sneaked into the bathroom after turning off the lights, took the tissue, chocolate, and shredded gloves, and stepped on the broken ones The injections were flushed together into the toilet in the bathroom."

Speaking of this, Song Wen stared at Lin Wanwan closely: "It's a pity, just after you finished these things, before you had time to wash your hands, they started poisoning, and the dormitory was completely dark, so you couldn't do more cleaning work. You go back When you got to your bed, because you were afraid of death, you hesitated to call an ambulance. At that time, you touched Guo Wei's mobile phone and left chocolate and your fingerprints on it. But you can't guarantee that the ambulance will come. Arrived after their deaths, so you hesitated and put your phone down again."

"Dong Fang was the first to attack and died quickly. Ma Aijing began to call for help. At this time, in a hurry, you covered her head with a quilt and pressed her tightly. The poisonous hair and suffocation made Ma Aijing Jing was in extreme pain, you used all your strength to control her, but this also made you useless, and you couldn't hold Guo Hua anymore. The terrified Guo Hua saw what happened in the dormitory, and ran from the door of the dormitory. Get out... You suffocated Ma Aijing to death, and when she heard the person in the next bedroom woke up, she also started to have a poisoning reaction, so she called 120."

Song Wen described this, if their deduction is correct, this is what happened in the dormitory that night, two girls died because of this, one girl is still unconscious, and the murderer, sitting opposite them, quietly Listening to all this, as if listening to a story that has nothing to do with her.

Lin Wanwan retorted in a deep voice: "Officer, you guys are really imaginative. I've said it many times, it's Guo Wei who is suffocating."

Song Wen sighed, the girl in front of her is really stubborn and confident, and she is still biting so tightly: "What you overlooked is that there are some chocolate residues left on your hands, and those chocolates follow your hands. , was rubbed everywhere."

Lin Wanwan blinked her eyes and breathed calmly: "I still remember that when eating chocolate at night, everyone got some chocolate on their hands and bodies, and then they vomited, and the dormitory was even more messy. What can it explain, maybe, my hand got some in a panic."

Song Wen explained: "But the location of those chocolates is quite special. On the floor of the toilet, we found a candy heart of a drop of chocolate. Next to it, we found half a footprint left on the ground. The pattern of the footprint, the size , are exactly the same as your slippers, next to the footprints, we found a small amount of glass shavings, and a small piece of rubber fragments, that should be the place where you handled the injection, and that piece of rubber should be your shredded glove."

"Why do you say it was me and not Guo Hua?" Lin Wanwan leaned back in her chair and continued to listen to Song Wen.

Song Wen turned the pen in his hand: "If it's just these discoveries, we are not enough to convict you, because the most important parts were flushed down the toilet by you, but we also found other traces. On the quilt of the dead Ma Aijing, we found more traces of chocolate, and those traces were left when you grabbed the quilt tightly to compete with the dying Ma Aijing."

Song Wen's eyes were fixed on Lin Wanwan's face, and the girl in front of her didn't panic when she heard this.Her tone was indifferent and indifferent: "Those are just crumbs of chocolate..."

It seemed that she had expected this question a long time ago, Song Wendao: "Yeah, we were also stumped by this at the beginning, and there was no name written on the chocolate. And as you said, lava chocolate is really easy to leave marks Yes, there are chocolates in the packing box, on the tissues in Dong Fang's trash can, on the cuffs of Ma Aijing's clothes, and on the floor next to Guo Hua's seat. We first put those vomit and fresh uneaten chocolate A distinction is made..."

When Song Wen said this, the corners of his mouth slightly raised: "Since this kind of chocolate is handmade, the size will vary, and the injection of green gas can't be very precise. We took these chocolate shavings and carried out precise The chemical composition was identified, so we calculated the concentration of green gas in the four chocolate balls."

Lin Wanwan's pupils shrank slightly.

"The chocolate on the bathroom floor, the chocolate on Guo Hua's phone, and the chocolate on Ma Aijing's quilt, the concentration of green gas in these chocolates is significantly lower than that of the other three lava chocolates. And this result can only be possible. There is an explanation—" Song Wen looked at Lin Wanwan with sharp eyes, like a knife piercing the heart: "These pieces of chocolate come from the same piece of lava chocolate. We have your fingerprints, and we also have your previous testimony, proving that this place was left by you. So it is not difficult to deduce that this piece of chocolate was eaten by you before, and the crime process I just mentioned is the truth of that night .”

This afternoon, after deriving the whole process, Lu Siyu proposed to ask Song Wen to further send those chocolate crumbs for inspection to find out the exact ingredients inside. There are not many of these crumbs, and many of them cannot be fingerprinted, but But it can help them locate the murderer.

In the dormitory, Lin Wanwan suffocated Ma Aijing to death, and Guo Wei went out to call for help. The behavior of the two people was completely different. Those chocolates with the same concentration were traces left by Lin Wanwan.

Once those liquids have been incorporated into the chocolate confectionery, fully integrated, each chocolate confectionery will have a fixed concentration.Those sweet, sticky things, with her fingers, spread in several corners of the bedroom.Sweet and bitter chocolate is a deadly weapon, but it also reveals who is the real murderer.

In order to make the results of the experiment more accurate, they even used new chocolate and injected green gas into them for many experiments. In the end, they finally had enough data to support their point of view.

Everything is over, the matter has come to this point, they finally found the key evidence and locked the suspect in this case.Guo Hua, who was lying in the ward, was just a puppet being used by others, and the one who really wanted the girls dead was Lin Wanwan.

At this time, Lin Wanwan's confession was no longer important, and the evidence of debris and physical evidence was enough to prove that it was she who pressed the quilt and smothered Ma Aijing to death.

When all the truth was revealed, Lu Siyu stopped recording and looked up at Lin Wanwan. There was not much expression on the girl's face.

"Do you have anything else to say?" Song Wen also looked at her.

He has interrogated countless prisoners, most of them were stubborn in the early stage, but in the final stage, they were defeated one by one, or their faces were ashen, or they cried bitterly, or they dragged others into the water. Facing these murderers, these suspicions When he was a human being, he had no sympathy, as if what was sitting in front of him was just a creature, but it could not be called a human being.

Lin Wanwan looked at him and said coldly, "I didn't do it."

"It's useless to deny it now." Song Wen said in a deep voice, "Pity your classmates, they should have a better future, but because of you...their lives have been changed. Killing always has a price .”

"Shut up! Don't say any more!" This was Lin Wanwan's first gaffe during the 48-hour interrogation.

In the interrogation room, Lin Wanwan looked at Song Wen and Lu Siyu in front of her, and raised her chin slightly. The interrogation light shone on her pale face, as if putting her in the spotlight. She quickly calmed down, her voice Calm and composed, without a trace of panic or trembling: "I didn't do those things, I didn't kill my classmates, the medicine was brought by Guo Hua, the chocolate was bought by Guo Hua, and she made them eat it. What you are talking about now These are all wronging me." She spoke righteously, her eyes were naturally tender and pitiful, as if everything really had nothing to do with her.

All the people in the observation room stared blankly at her. In the face of irrefutable evidence, she kept her expression unchanged and continued to lie.

Thinking of the whole process of the case, Fu Linjiang's back felt chills.

Looking at the interrogation room, Lao Jia frowned slightly, and asked with some doubts: "Is it really not her? Is there something wrong with us?"

"Do you think Xu Yao's test results will be wrong? Or do you think Team Song's reasoning is wrong?" Fu Linjiang asked him back, "She didn't talk about the chocolate issue anymore, but avoided the important ones and was still trying to win sympathy. Now, facing the Iron proof, so indifferent, this is not a normal person's reaction, this arrogance and self-confidence itself is her biggest loophole."

Zhu Xiao also nodded: "We can't understand such people, but it doesn't mean that such people don't exist."

Human thoughts are hidden in the body, both good and bad. Some vicious thoughts are like vines soaked in poison, growing out of the heart, relying on human flesh and blood, continuously accumulating and spreading, and finally killing The whole person is wrapped in it.A person with a poisonous heart may not feel any difference, but in the eyes of others, it is shuddering.Once the venom bursts out, it will not only poison others, but also poison itself.

Lin Wanwan seems to have no sympathy, no empathy, no respect for life, some are only herself, others, whether family or friends, are all her puppets. Just how arrogant, in her dictionary, panic does not exist, as if everything is not worth it.

If it wasn't for the chocolates, her carefully chosen chocolates, they might not have caught her at all.

The rain in Nancheng finally fell, although it was a few days late.Maybe it's because it's been stuffy for a long time, but the rain came very quickly. From the night, the big raindrops formed an impenetrable water curtain, covering the city. The rain didn't stop, and soon fell on the ground. A thick layer of water has accumulated.The sky and the earth seemed to have been washed cleanly by the rain.The stickiness in the air was gone, replaced by fresh grass fragrance.

At 01:30 in the morning, the overtime work was over, the final finishing work of the case was completed, and preparations were made for the escort and handover. Song Wen drove the police car under the steps of the police station, but drove away in no hurry.

In the distance, Lin Xiuran got off a taxi and walked in with a black umbrella. Song Wen yelled, "Forensic doctor Lin, work overtime."

"Well, I just came back from the funeral parlor, and another corpse was just found." Lin Xiuran remembered something while talking, "By the way, Guo Hua survived another rescue, and tomorrow, she will be transferred to Hongcheng, where the conditions are better. hospital for treatment."

Song Wenchong nodded at him.

People had left one after another, and Lu Siyu, who was carrying a bag, appeared at the gate of the police station.

Song Wen pretended to be here just now, and waved to him: "You didn't drive today, come, the police car will take you for a ride."

Lu Siyu responded, walked over, and started rubbing his eyes when he got in the car, completely losing the energy he had just now.Now he is not only sleepy, but also cold, like being in the snow and ice, walking through the long wasteland, exhausting all his strength, he just wants to go back to his warm home, hug his dog, and have a good sleep.

Song Wen saw that he was not moving, turned sideways, helped him to buckle his seat belt, and then praised: "Good job, thanks to you, the suspect was finally pressed to death today."

Lu Siyu hummed, he didn't think he had done anything extraordinary.

Song Wendao: "If the case can't be solved, then Guo Wei's family will be miserable. It means you saved them."

"It was the physical evidence that broke the case. I just connected the clues." Lu Siyu blinked and suddenly remembered the cold hands of Guo Hua's mother. Impulsive, now he is sitting in the car, his body is exhausted to the point of collapse, but the bottom of his heart has never felt calm, and he still has a little satisfaction. It turns out that justice feels like this.This is what Song Wen has been pursuing.

"Hey, why didn't you let me say that you came up with this idea?" Song Wen asked the question in his heart. On the train, after Lu Siyu speculated about the relationship between the dormitory, he thought of testing the concentration of chocolate to judge Lin Wanwan. Whether it was the murderer's method, but at that time he made a request, asking Song Wen to promise him not to mention these things with others.

At first Song Wen thought that Lu Siyu was not too sure, and was afraid that the result of the verification would be wrong, but later, he found that Lu Siyu had already believed that he was correct.

"If I brought it up, it would be a bit too slap on Lao Jia's face. I can't offend everyone..." Lu Siyu spoke, as if he really wanted to hang around here, because Relationships feel like a headache.

Song Wen started the police car, and the rain hit the glass of the police car, making a faint sound. The headlights reflected Lu Siyu's side face, fair, handsome, deserted, and indifferent.

Song Wen suddenly thought of their conversation in the afternoon. Everyone's situation and understanding of the matter were inseparable from his experience and background.So, what did Lu Siyu, who was able to see through the criminal's psychology and resonate with the suspect, experience?

Song Wen couldn't help asking him: "You said, Lin Wanwan chose chocolate because it was her favorite candy, and it was a reward she got when she was a child."

Lu Siyu hummed in a low voice.

"So what about you?" Song Wen turned to look at him, "What have you experienced?"

Lu Siyu didn't speak, and changed into a more comfortable posture. Just when Song Wen thought he wouldn't tell him, Lu Siyu suddenly looked out the window and whispered: "Captain Song, I'm a little hungry..."

What kind of feeling is hunger, like ice scum in the stomach, stinging the body, all the organs are clamoring, all the cells are soaked in cold, you can experience the track of life passing away bit by bit.The only word left in my mind is enough to drive people crazy.

Eating is an instinctive need directly linked to life. Human beings can do anything in order to eat something.So eating is the most important thing in the world, and food is the most important thing in the world.For it, human beings can break out wars, and for it, they can also mercilessly deprive other creatures of their lives.

Outside the car, the rain has been falling non-stop, and it is full of rustling sound when it falls on the car window. The rainy season in Nancheng seems to be coming early...