Criminal Investigation Notes

In the early morning of the third day of the crime, Song Wen's team worked overtime as usual. All of them were waiting for the result of an experiment, which will determine the direction of the whole case.

In order to achieve this result, Song Wen went to find Cheng Xiaobing and requisitioned a box of lava chocolate she had bought. Xu Yao and other colleagues from the identification center were busy in the afternoon. They even consulted the professor of Chemistry Department of Nancheng University and recruited the precision instruments of Nancheng chemical plant for testing.

Lu Siyu sits at his desk, reading all the information. He is so sleepy that his eyes are about to close. In order to be sober, he gets up and goes to the bathroom. On the way, he goes to 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 a suspect, you should apologize to Xiao Lu."

Old Jia touched his nose: "the result has not come out yet."

Fu Linjiang said: "you follow Guo's line and run back and forth for a day. If you don't find any relevant clues, don't be so stubborn."

Lao Jia had a premonition that he was wrong. However, as an old criminal policeman, he also had to face up to him. He really wanted to apologize to an intern policeman, but he felt that he could not afford to lose his face. Seeing Lu Si Yu come in, Fu Linjiang doesn't urge him any more and leaves from Jia's desk.

Lu Siyu is sitting on the chair. He has just washed his face with cold water. He still has some water drops on his hair. He takes a paper towel and wipes it.

Song Wen came to his heart and said, "if you can't hold on, go back."

Lu Siyu raised his head and whispered, "Song team, everyone else is working overtime." He didn't quite understand why Song Wen suddenly took pity on her. If he left alone and looked back, no matter what the result would be, these comrades who worked overtime would be envious.

Song Wen looked down at Lu Siyu, and his skin was white and transparent: "they slept all night yesterday and didn't sort out the information. I'm serious. If you can't make it, you can go to the sofa in the office of Gu Bureau for a while."

Lu Si Yu held the thermos cup in his hand and shook his head obstinately: "forget it. I guess the result will come out later. I'm also curious about the truth."

With these words, Xu Yao came in from the outside on her high-heeled shoes, and then took out a stack of laboratory materials from the bag: "several chemical rooms worked all night, and finally came out."

All the people gathered around when they heard the news. Song Wen took those test sheets, looked at the pile of figures above, and picked a little bit from the corner of his mouth. Then he looked at Lu Si Yu and said, "go, follow me to judge Lin wanwan."

Lu Si language followed him to get up, and the whole person suddenly woke up, with a little excitement in his always cold expression.

As soon as the door of the interrogation room opened, Lin wanwan moved. From lying down to looking up, she looked at Song Wen and Lu Siyu who came in. This was the second day that she had been locked in the interrogation room. The first night, she was given special treatment and was shut up in a room with a bed for a while. Today, she was shut up here for a day. The long torture made her look extraordinary Haggard, is also extremely pitiful.

"Is forty-eight hours coming? Or did Guo Zhen wake up? Did you check it out? According to the rules, you can only detain me for such a long time. " Lin wanwan said as if he had decided that he was the winner of the game.

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

Lin wanwan hugged his arm: "why do you suspect that I killed people? I've said everything I have to say. The whole thing has nothing to do with me. "

Song Wen leaned his back on the back and looked at her coldly: "you know, 48 hours is coming. I will come here to see you if there is no evidence." Then he spoke in a low voice, as if in front of the girl in front of the sentence: "we found the key evidence, is you, want to borrow Guo Zhen's hand, kill your classmate."

Lin wanwan pursed his lips: "officer, what you say should be evidence-based."

Song Wen narrowed his eyes and said, "when did your plan come into effect? Did you start when you found out that dog thieves often come to the pet store? Is it to introduce Guo Zhen to the past work? Did you start testing doses on stray cats? Or are you deliberately provoking the war in the dormitory, asking Guo Zhen to buy chocolate and Dong Fang, and Ma AI to say something and start? "

Under the light of the interrogation room, Lin wanwan's eyes were as clear as the best 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, you chose a kind of net red lava chocolate. There are exactly four in a box. There is a layer of outer skin on the outside of the chocolate, and inside are all the sugar cores of the chocolate, which is convenient for dissolving the green vaporized substance. That morning, you pretended to be kind and took the express back when no one was around. In order not to leave fingerprints, you put on gloves and injected poison into four chocolates. In order not to be doubted afterwards, you injected each piece with poison. However, because you are so afraid of death, you put a mark on one of the chocolate balls. Only a small amount of poison was injected into the chocolate ball"Those chocolates have been left for a while, and when you eat them, the sugar in each chocolate bar is highly toxic. In the evening, the three of them returned to the dormitory one after another. You are very familiar with each of them. You know that they all like to eat sweets. I don't know what kind of rhetoric you used to let Guo Zhen hold the box and share the chocolate. You got the piece prepared in advance, and then the three of them ate it unprepared. "

Lin wanwan pursed his lips and didn't speak. Song Wen went on: "you know that the green vaporization is very poisonous. I'm afraid this chocolate will kill you. So even if you take the smallest dose of chocolate, you still haven't finished your chocolate. You hide the remaining chocolate in a tissue. When everyone has finished washing and going to bed, you sneak in after turning off the light In the bathroom, I flushed paper towels, chocolate, chopped gloves and crushed injections into the toilet

Speaking of this, Song Wen kept a close eye on Lin wanwan: "it's a pity that as soon as you finish these tasks and before you have time to wash your hands, they start to poison. The bedroom is dark, so you can't do more cleaning work. You go back to your bed. Because you are afraid of death, you have hesitated to call an ambulance. At that time, you touched Guo's mobile phone and left chocolate and your fingerprints on it. But you can't guarantee that the ambulance will arrive after their death, so you hesitated and put down your cell phone again

"Dong Fang was the first to attack and die quickly. Ma Aijing began to cry for help. At this time, you were in a hurry, covered her head with a quilt, and pressed her tightly. The poisonous hair and suffocation made Ma Aijing extremely miserable. You used all your strength to control her. However, this also made you lack of skills. You could no longer hold Guo Fen. The frightened Guo fan saw the dormitory What happened, ran out from the bedroom door You suffocated Ma Aijing. When you heard that the people in the next bedroom woke up, you also began to have a toxic reaction, so you dialed 120. "

Song Wen described these things. If their inference is correct, this is what happened in the bedroom that night. Two girls were killed, one girl was still unconscious, and the murderer, sitting opposite them, quietly listened to all this, as if listening to a story that had nothing to do with her.

Lin wanwan retorted in a deep voice: "officer, you are really imaginative. I've said it many times. It's Guo who suffocates. "

Song Wen sighed. The girl in front of her was really stubborn and confident. Up to now, she still bit so tightly: "what you miss is that there are some chocolate residues left on your hands, and those chocolates are rubbed everywhere with your hands."

Lin wanwan blinked his eyes and breathed calmly: "I still remember that when eating chocolate in the evening, some chocolate was stuck on everyone's hands. Later, they vomited, and the dormitory was in a mess. What does this mean? Maybe my hands 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 drop of chocolate candy heart. Beside, we found half of the footprints left on the ground. The pattern and size of the footprints are exactly the same as those of your slippers. Next to the footprints, we found a trace of glass chips and a small piece of rubber fragments It should be the place where you deal with the injection, that piece of rubber, it should be your cut gloves

"Why do you say it's me, not Guo fan?" Lin wanwan leaned back in his chair and continued to listen to Song Wen.

Song Wen turned his pen: "if only these discoveries, we are not enough to convict you, because those most important parts have been flushed into the toilet by you, but we also found other traces. On the quilt that suffocated Ma Aijing, we found more traces of chocolate. Those marks are that you hold on to the quilt and Ma AI Jingkang, who is dying It was left by the time

Song Wen's eyes, staring at Lin wanwan's face, the girl in front of her heard this, but still did not panic. Her tone is indifferent and indifferent: "those, just some chocolate crumbs..."

It seemed that she would ask this question for a long time. Song Wen said, "yes, we were puzzled by this at first. There was no name on the chocolate. And as you said, lava chocolate is so easy to leave traces. In the packed box, on the paper towel in Dong Fang's garbage can, on the cuff of Ma Aijing's clothes, and on the floor beside Guo's seat, we first distinguish those vomit and fresh and unused chocolate... "

Song Wen raised his mouth slightly: "this kind of chocolate, because it is handmade, will be different in size, and the injection of cyan gasification can not be very accurate. We took the chocolate chips for accurate chemical identification, so we calculated the concentration of cyan gasification in the four chocolate balls."

Lin wanwan's pupil shrank slightly.

"The chocolate on the toilet floor, on Guo's mobile phone, and on Ma Aijing's quilt, the concentration of cyan vapors in these chocolates is significantly lower than that in the other three lava chocolates. There is only one explanation for this result: "Song Wen looks at Lin wanwan with sharp eyes, like a knife stabbing into the heart:" the fragments of chocolate in many places originate from the same piece of lava chocolate. There are your fingerprints on the chocolate left on Guo's mobile phone. We also have your previous testimony to prove that you left this place. So it's not difficult to deduce that this chocolate is what you ate before. What I just said about the crime process is the truth of that night. "This afternoon, after deducing the whole process, Lu Siyu suggested that Song Wen send the chocolate chips before him for further examination to find out the exact ingredients in them. There are not many of them, and many of them can't get fingerprints, but they can help them identify the murderer.

In the bedroom, Lin wanwan suffocates Ma Aijing, and Guo Fen goes out to call for help. The two people's behavior routes are completely different. Those chocolate with the same concentration are all traces left by Lin wanwan.

Once the liquid is mixed into the core of chocolate and fully fused, each chocolate core will have a fixed concentration. Those sweet, sticky things, along with her fingers, spread in several corners of the bedroom. Sweet with bitter chocolate, is a sharp weapon, but also exposed who is the real killer.

In order to make the results accurate, they even used new chocolate, injected cyan gasification, and did many experiments. Finally, there was enough data to support their view.

Everything is over, the matter has come to this point, they finally found the key evidence, lock in the suspect of this case. Guo Zhen lying in the ward is just a puppet used by others. The one who really wants the girls to die is Lin wanwan.

At this time, Lin wanwan's confession was no longer important. The evidence of the debris and material evidence was enough to prove that she held down the quilt and suffocated Ma Aijing.

When all the truth is revealed, Lu Si Yu stops recording and looks up at Lin wanwan. There is 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 are hard spoken in the early stage. At the final stage, he is defeated one by one, or his face turns pale, or he cries bitterly, or pulls others into the water. When facing these murderers, he has no sympathy. It seems that what is sitting in front of him is just a creature, but not a human being.

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

"It's no use denying 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. There is always a price to pay for killing. "

"Shut up! Don't say any more! " This is the first gaffe of Lin wanwan in the whole 48 hour trial.

In the interrogation room, Lin wanwan looked at Song Wen and Lu Si Yu in front of him, and raised his chin slightly. The interrogation lamp illuminated her pale face as if she were under the spotlight. She soon calmed down. Her voice was calm and calm, without a trace of panic and trembling: "I didn't do those things. I didn't kill my classmates. The medicine was brought by Guo Zhen, and the chocolate was Guo Fen She bought them. She made them eat them. What you're talking about now is basically unjust to me. " Her righteous words, that pair of eyes, naturally with ChuChu pitiful, as if everything really has nothing to do with her.

All the people in the observation room staring at her, in front of the hard evidence, she still so unchanged, continue to lie.

Thinking of the whole process of the case, Fu Linjiang's back bursts of cold.

Looking at the interrogation room, Lao Jia frowned slightly and said in some doubt, "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 song's reasoning is wrong? " Fu Linjiang asked him, "she didn't talk about chocolate any more. Instead, she avoided the heavy ones and was still winning sympathy. Now, in the face of hard evidence, so indifferent, this is not a normal response, this arrogance and self-confidence itself is her biggest loophole. "

Zhu Xiao also nodded: "we can not understand such people, does not mean that such people do not exist."

People's thinking, hidden in the body, there are good and bad, some vicious thoughts, like a vine soaked in poison, grow out of the heart, with the help of human flesh and blood, constantly accumulate and spread, and finally wrap up the whole person. The person who has a heart may not feel different, but it seems to others that it is chilly. Once the venom bursts out, it will not only poison others, but also yourself.

Lin wanwan seems to have no sympathy, no sympathy, no respect for life. There are only herself, others, family members and friends, who are her puppets. How soft her appearance is, how arrogant she is. In her dictionary, there is no panic, as if everything is not worth it.

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

The rain in Nancheng finally came down, although it was a few days late. Maybe it was because it was stuffy for a long time, the rain came very quickly. From the night, the big drops of rain formed a dense curtain of water, covering the city. The rain kept on, and soon accumulated a thick layer of water on the ground. Heaven and earth seem to be washed clean by the rain. The trace of sticky air disappeared, replaced by fresh grass fragrance.

At 1:30 in the morning, the overtime work ended, the final finishing work of the case was completed, and preparations were made for the escort handover. Song Wen drove the police car to the steps at the entrance of the police station, but he was not in a hurry to drive away.

Far away, Lin xiuran got out of a taxi and came in with a black umbrella. Song Wen called out, "forensic Lin, work overtime.""Well, just back from the funeral home, another body has just been found." Lin xiuran said and thought of what, "by the way, Guo fan survived a rescue, tomorrow, she will be transferred to better conditions of Hongcheng hospital for treatment."

Song Wenchong nodded to him.

People continue to walk almost, carrying a bag of Lushi language, this appeared in the police station door.

Song Wen pretended to have just come here and waved to him: "you didn't drive today. Come, the police car will give you a ride."

Lu Si Yu answered, walked over, got on the car, and began to rub his eyes, completely lost the spirit of just now. Now he is not only sleepy, but also cold, as if in the ice and snow, through the long wilderness, exhausted all his strength, just want to go back to his warm home, holding his dog, a good sleep.

Seeing that he didn't move, Song Wen leaned over and helped him pull the seat belt buckle. Then he praised him and said, "well done. Thanks to you today, I finally put the suspect to death."

Lu Si said, he didn't think he had done anything great.

Song Wen said: "if the case can't be solved, then Guo's family will be miserable. It means that you saved them."

"It's the physical evidence that broke the case. I just put the clues together." Lu Si Yu blinked, and suddenly thought of Guo's mother's cold hands. In fact, he didn't want to save people in the past, but he was on impulse at that time. Now he sits in the car, tired and exhausted, but his heart has never been calm and has a little satisfaction. Justice is what justice feels like. This is what song Wen has been pursuing.

"Well, why don't you let me say it was your idea?" Song Wen asks the question in his heart. On the train, Lu Siyu speculates about the relationship between the dormitory and comes up with a method to test the concentration of chocolate to judge whether Lin wanwan is the murderer. But at that time, he made a request that Song Wen promise him not to mention these things to other people.

At first, Song Wen thought that the Lushi language was not very sure. He was afraid that the result of verification was wrong. But later, he found that the Lushi language had already confirmed that he was correct.

"If I put it forward, it would be a bit too hard to beat Lao Jia in the face. I can't offend all the people..." Lu Si said, as if he wanted to get along here with his heart and felt a headache for his interpersonal relationship.

Song Wen started the police car. The rain hit the glass of the police car and made a weak sound. The side face of Lu Si language was reflected in the front lamp. It was white, beautiful, cold and indifferent.

Song Wen suddenly thought of their conversation in the afternoon. Everyone's situation and understanding of things were inseparable from his experience and origin. So, what has happened to the Lushi language, which can see through the criminal's psychology and resonate with the suspect?

Song Wen couldn't help but ask him, "you said that Lin wanwan chose chocolate because it was her favorite candy and the reward she got when she was a child."

There was a low hum in Luxi.

"And you?" Song Wen turned to look at him, "what have you experienced?"

Lu Siyu did not speak and changed a more comfortable posture. Just when Song Wen thought he would not tell him, Lu Siyu suddenly looked out of the window and whispered, "Song team, I'm a little hungry..."

What's the feeling of starvation? It's like ice dregs in the stomach, stinging the body, all organs are shouting, all cells are getting cold, and we can feel the trace of life passing away. Only one word left in my mind is enough to drive people crazy.

Eating is an instinctive demand directly linked to life. Human beings can do anything to eat something. So eating is the most important thing in the world. Food is the most important thing in the world. For it, human beings can break out war, and for it, they can take the lives of other creatures mercilessly.

Outside the car, it's raining all the time, and it's all rustling on the windows. The rainy season in Nancheng seems to be coming ahead of time