Criminal Investigation Notes

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 will determine the course of the entire case.

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

Lu Siyu sat at his desk, reading the documents, and was so sleepy that he was about to close his eyes. In order to be more awake, he got up and went to the bathroom, and stopped by the water dispenser outside to get a cup of hot water.

While he was out, Fu Linjiang pushed Lao Jia: "If it turns out that Lin Wanwan is the suspect, you apologize to Xiao Lu."

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

Fu Linjiang said: "You followed Guo Wei's line and ran back and forth for a day. If you didn't find any relevant clues, don't die."

Lao Jia had a hunch in his heart that he might be wrong, but as an old criminal policeman, he also wanted face. He really wanted to apologize to a trainee police officer, but he felt that he couldn't lose his face.Seeing Lu Siyu coming in, Fu Linjiang did not urge him again and left from Lao Jia's desk.

Lu Siyu sat on the chair. He had just washed his face with cold water, and there was still some water droplets on his hair, so he wiped it with a tissue.

Song Wen walked over and said kindly, "If you can't hold it, 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 got up with pity and pity. If he withdrew alone, no matter what the result is, these comrades who worked overtime. I got jealous.

Song Wen looked down at Lu Siyu, and the skin he had just washed was white to almost transparent: "They slept all night yesterday and didn't sort out the information. I'm serious. If you can't stand it, you can still go to the police. Squint on the office sofa for a while."

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

While talking, Xu Yao stepped on high heels and walked in from outside, then took out a stack of test materials from the bag: "Several chemistry rooms rushed to work overnight, and the result 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 picked up the corner of his mouth.Then he looked at Lu Siyu and said, "Go, follow me to interrogate Lin Wanwan."

Lu Siyu followed him to his feet, and his whole body instantly became sober, with a bit of excitement in his always cold expression.

As soon as the door of the interrogation room opened, Lin Wanwan moved, turning from lying on her stomach to raising her head, looking at Song Wen and Lu Siyu who walked in. This was the second time she was locked in the interrogation room. OMG, the first night she received special treatment and was confined to a room with a bed to sleep for a while, but today she was confined here for a day. The long torture made her look very haggard and also exceptional The pathetic.

"Is forty-eight hours coming? Or is Guo Wei awake. Have you checked it out? According to the regulations, you can only detain me for so long." Lin Wanwan said, 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 have said everything I should say, the whole thing has nothing to do with me."

Song Wen leaned his back on the backrest and looked at her indifferently: "You also know that forty-eight hours is about to arrive. If there is no evidence, will I come here to see you?" Then he whispered, as if he was right. The girl in front of the sentence pronounced: "We have found the key evidence. It is you who want to use Guo Wei's hand to kill your classmate."

Lin Wanwan pursed her lips: "Police officer, what you said, you must pay attention to evidence."

Song Wen squinted his eyes and said, "When did your plan start? It was when you found out that the dog thieves often came to the pet shop? It was the introduction of Guo Wei to work? It was you who worked with the stray cats. Did you start the test dose on your body? Or did you deliberately start the war in the dormitory and let Guo Wei buy chocolate and Dong Fang and Ma Ai Jingyan and start?"

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

Song Wen continued: "You must be very curious about where you left your feet. I can restore the process of the crime. In order to facilitate the poisoning, this time you chose a kind of Internet celebrity lava chocolate. A box is just right. Four, the chocolate has a layer of skin on the outside, and the inside is filled with chocolate sugar cores to facilitate the dissolution of the blue vapors. That morning, you pretended to be kind and took the courier back when no one was there. In order not to leave fingerprints, you Wearing gloves, you injected poison into the four chocolates. In order not to be suspected afterwards, you injected each piece with poison. However, because you were too afraid of death, you marked the one you chose. In that chocolate ball, only a small amount of poison was injected."

"Those chocolates were left to stand for a while. When you eat them, the candy hearts of each piece of chocolate are very poisonous. At night, the three of them returned to the dormitory one after another. You are very familiar with each of them, knowing that they are all I like to eat sweets. I don’t know what kind of rhetoric you used to ask Guo Wei to hold the box. Everyone shared the chocolate. You got the piece prepared in advance. Then the three of them ate it unsuspectingly."

Lin Wanwan pursed her lips, did not speak, and Song Wen continued: "You know that blue gas is highly toxic, and you are afraid that this chocolate will kill you, so even if you take the piece with the smallest dose, you still You didn’t finish your share of chocolate, you hid the remaining chocolate in a paper towel, and waited for everyone to wash and go to bed, but you sneaked into the bathroom after turning off the lights, and stepped on the paper towels, chocolate, and shredded gloves. The injection was flushed into the toilet bowl together."

Speaking of this, Song Wen stared at Lin Wanwan closely: "Unfortunately, you have just finished this and before you have time to wash your hands, they started to have poisonous hair, and the bedroom is completely dark, preventing you from doing more cleaning work. You return. When you got to your bed, because you were afraid of death, you once hesitated whether to call an ambulance. At that time, you touched Guo Wei’s cell phone and left chocolate and your fingerprints on it. But you cannot guarantee that the ambulance will They arrived after their deaths, so you hesitated and put your phone down again."

"Dong Fang first attacked and died quickly. Ma Aijing began to cry for help. At this moment, in your desperation, you covered her head with a quilt and pressed her tightly, poisoning her and suffocating her. Quietly painful, you used your whole body strength to control her, but this also makes you lack the ability to do so, and can no longer hold Guo Wei. The frightened Guo Wei saw everything that happened in the dormitory and ran from the door of the dormitory. Going out... You suffocated Ma Aijing. Hearing that the person in the bedroom next door woke up, he also started to have a poisoned reaction, so he called 120."

Song Wen described this. If their inference is not wrong, this is what happened that night in the dormitory. Two girls died because of this. One girl is still unconscious, and the murderer, sitting opposite them, quietly Listening to all this, it was as if listening to a story that had nothing to do with her.

Lin Wanwan retorted in a deep voice, "Police officer, you are really imaginative. I have said that many times, it is Guo Wei who is suffocating."

Song Wen sighed. The girl in front of her was really stubborn and confident. Even now, she still bites so tightly: "What you missed is that there are some chocolate residues left in your hands, and those chocolates follow your hands. , Was rubbed everywhere."

Lin Wanwan blinked and breathed calmly: "I still remember that when I ate chocolate at night, everyone had some chocolate on their hands and bodies. Later they vomited and the dorm was messed up. What can it explain? Maybe, my hand got a little bit in panic."

Song Wen explained: "But the places left by the chocolates are quite special. On the floor of the toilet, we found a drop of chocolate candy heart. Next to it, we found the half of the footprint left on the ground, the pattern and size of the footprint. They are exactly the same as your slippers. Next to the footprints, we found a small amount of glass scraps and a small piece of rubber. That should be where you handled the injection. That piece of rubber should be your cut gloves."

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

Song Wen turned the pen in his hand: "If only these discoveries were made, we would not be enough to convict you, because you flushed the most important parts to the toilet, but we also found other traces. On the quilt of the dead Ma Aijing, we found more chocolate traces. Those traces were left when you grasped the quilt tightly against the dying Ma Aijing."

Song Wen's gaze was fixed on Lin Wanwan's face, and the girl in front of her heard this, but still did not panic.Her tone was indifferent and indifferent: "Those are just bits of chocolate..."

It seems that she had long expected that she would ask this question, Song Wen said: "Yes, we were also stumped by this at first, there is no name written on the chocolate. And as you said, lava chocolate is really too easy to leave marks. Now, in the packaged box, on the paper towels in Dong Fang’s trash can, on the cuffs of Ma Aijing’s clothes, and on the floor next to Guo Wei’s seat, there are chocolates. First, we will put those vomit and fresh uneaten chocolate A distinction is made..."

When Song Wen said this, the corner of his mouth was slightly raised: "This chocolate, because it is made by hand, will vary in size, and the injection of blue vapor can not be very precise. We took the chocolate chips and performed precise Chemical composition identification, so we calculated the concentration of blue vapor in the four chocolate balls."

Lin Wanwan's pupils shrank slightly.

"The chocolate on the bathroom floor, the chocolate on Guo Wei's phone, and the chocolate on Ma Aijing's quilt. The concentration of blue vapors in these chocolates is significantly lower than the other three lava chocolates. And this result is only possible. There is an explanation—"Song Wen looked at Lin Wanwan, his eyes sharp, like a knife that pierced the heart: "The crumbs of these multiple chocolates originated from the same piece of lava chocolate. The chocolate left on Guo Wei's phone With your fingerprints, we also have your previous testimony, which proves 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 I just mentioned is the truth of that night. ."

This afternoon, after deriving the whole process, Lu Siyu suggested that Song Wen should send the chocolate crumbs for further inspection, and the exact ingredients inside were tested. There are not many crumbs and many of them cannot be fingerprinted, but But it can help them locate the murderer.

In the bedroom, Lin Wanwan suffocated Ma Aijing, and Guo Wei went out to call for help. The two people had completely different behavior routes. The chocolates with the same concentration were all traces left by Lin Wanwan.

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

In order to make the test results accurate, they even used new chocolates and infused blue vapors to do multiple tests. In the end, they finally had enough data to support their views.

Everything is over, the matter is here, they finally found the key evidence and locked the suspect in the case.Guo Xu lying in the ward was just a puppet used by others, and the one who really wanted the girls to die was Lin Wanwan.

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

All the truth was revealed, Lu Siyu stopped recording from the side, and looked up at Lin Wanwan, the girl didn't have much expression on her face.

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

He has interrogated countless prisoners, most of them were stiff in the early stage, and at the final stage, they were defeated one by one, either with ashen faces, or crying, or dragging others into the water, facing these murderers, these suspects When he was human, he had no sympathy, as if sitting in front of him was just a creature, but he could not be called a human.

Lin Wanwan looked at him and said coldly: "I didn't do things."

"It's no use wanting to deny it now." Song Wen said solemnly, "Pity your classmates, they should have a better future, but because of you... their lives have been changed. Killing always has to pay a price. ."

"Shut up! Stop talking!" This is the first time Lin Wanwan's gaffe has occurred during the entire 48 hours of interrogation.

In the interrogation room, Lin Wanwan looked at Song Wen and Lu Siyu in front of him, lifted her chin slightly, the interrogation lamp illuminated her pale face, as if putting her under the spotlight, she quickly calmed down, her voice Calm and calm, without a trace of panic or trembling: "I didn't do those things, I didn't kill my classmates, the medicine was bought by Guo Wei, the chocolate was bought by Guo Wei, and she let them eat it. What you are talking about now These are simply wronging me." She said righteously, and her eyes naturally contained pity, as if everything really had nothing to do with her.

All the people in the observation room stared at her blankly. In front of the hard evidence, she remained so unresolved and continued to lie.

Thinking of the entire process of the case, Fu Linjiang felt cold behind his back.

Lao Jia looked at the interrogation room and frowned slightly, wondering: "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 the Song team's reasoning is wrong?" Fu Linjiang asked him back, "She didn't talk about the chocolate problem anymore, but avoided the heavyweights and was still gaining sympathy. It is iron proof that it is 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, and it doesn't mean that such people don't exist."

Human thinking is hidden in the body. There are good and bad, and some vicious thoughts, like vines soaked in poison, grow out of the heart. With the help of human flesh and blood, they continue to accumulate, spread, and finally The whole person is wrapped in it.A person with a poisonous heart may not feel any difference in himself, but it seems to others that they shudder.Once the venom bursts out, it will not only poison others but also yourself.

Lin Wanwan seems to have no sympathy, no empathy, and no respect for life. Some are only her own, and others, whether family members or friends, are all her puppets. How soft is her appearance, and her heart There is so much arrogance that in her dictionary, panic does not exist, as if everything is not worth it.

If it weren't for those chocolates, her carefully selected chocolates, they might not be able to catch her at all.

The rain in Nancheng finally came down, although it was a few days late.Maybe it’s because it’s been boring for a long time. The rain came very urgently. From the beginning of the night, large drops of rain formed an impermeable curtain of water, covering the city. The rain has never stopped, and soon on the ground. A thick layer of water was accumulated.The world seemed to be washed cleanly by the rain.The stickiness in the air was gone, replaced by the fresh fragrance of grass.

At half past one in the morning, the overtime work ended, the final finishing work of the case was completed, and the escort was ready to be handed over. Song Wen drove the police car under the steps of the police station, but did not rush away.

Far away, Lin Xiuran got out of a rental car and walked in with a black umbrella from the outside. Song Wen shouted: "Forensic Doctor Lin, work overtime."

"Well, just came back from the funeral home, and another corpse was just found." Lin Xiuran remembered something as she said, "By the way, Guo Wei survived another rescue. Tomorrow, she will transfer to Hongcheng where conditions are better. The hospital receives treatment."

Song Wen nodded at him.

People walked almost one after another, and Lu Siyu, carrying his bag, appeared at the door of the police station.

Song Wen pretended to have just arrived here and waved to him: "You didn't drive today. Come, the police car will pick you up."

Lu Siyu replied, walked over, and started rubbing his eyes when he got in the car, completely losing his energy.Now he is not only sleepy, but also cold, like walking through the long wasteland, exhausted all his energy, just want to return to his warm home, hug his dog, and sleep beautifully.

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

Lu Siyu snorted, he didn't think he had done anything great.

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

"It is the evidence of physical evidence that solved the case. I just put the clues together." Lu Siyu blinked his eyes and suddenly remembered the cold hands of Guo Wei's mother. He didn't actually want to save people. It was just a moment. Impulsively, now he is sitting in the car, his body is exhausted, but his heart has never been calm before, and there is a little bit of satisfaction. It turns out that justice is like this.This is what Song Wen has been pursuing.

"Hey, why don't you let me say that this idea is what you think?" Song Wen asked the question in his mind. On the train, after Lu Siyu guessed the relationship between the dormitories, he thought of testing the chocolate concentration to judge Lin Wanwan. Whether it was the murderer's method, but at that time he made a request and asked Song Wen to promise him not to mention this to other people.

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

"If I put it forward, it would have hit Lao Jia's face too much, I can't just offend everyone..." Lu Siyu said, as if he really wanted to get mixed up here. Interpersonal relationship has a headache.

Song Wen started the police car, and the rain hit the glass of the police car, making a faint sound, and Lu Siyu's profile was reflected in the front lights, white, handsome, cold, and indifferent.

Song Wen suddenly thought of their conversation in the afternoon. The situation presented by everyone and their understanding of things are inseparable from his experience and origin.So, what did Lu Siyu, who can see through the psychology of the criminal and resonate with the suspect, have experienced?

Song Wen couldn't help asking him: "You said that Lin Wanwan chose chocolate because it was her favorite candy and the 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 did not speak, and changed to a more comfortable posture. Just when Song Wen thought he would not tell him, Lu Siyu suddenly looked out the window and whispered: "Song team, I'm a little hungry..."

What kind of feeling is hunger, like there is ice scum in the stomach, stinging the body, all the organs are clamoring, all the cells are cold, and you can feel the trajectory of life.There is only one word left in his mind, which is enough to drive people crazy.

Eating is an instinctive need directly linked to life. Humans can do whatever they want to eat.So eating is the most important thing in the world, and food is the most important thing in the world.For it, humans can break out of war, for it, they can also mercilessly deprive other creatures of their lives.

Outside the car, the rain kept falling, and it was full of rustling noises on the window. The rainy season in Nancheng seems to be coming early...