Chapter 5 The Second Case Gray Scientific Research (3)

Author: Gao Buwei

Chapter 5 The Second Case Gray Scientific Research (3)

Pi Peng examined the fiber found in the nail seam, compared the material and color in the computer material library, and found the manufacturer. Pi Peng passed the information to the public security department where the manufacturer was located, and the manufacturer confirmed that this was

The fiber used in the shirts they produced a few years ago is now rarely used, and the last batch of products was discontinued two years ago because of their older styles.

Huang Yiwei suggested checking Wang Zhili's activities at Tianyang University during the time of the incident and checking all available videos.

Peng Ying complained a little: "Boss, I have already copied it back, and Brother Qiang has brought it back to the doctoral student dormitory. In addition to the current arrangements, it is difficult for me to finish reading it before the case analysis meeting in the evening."

Huang Yiwei pointed at him with a smile and said: "Trying to play tricks with me, I have also done picture detection in the past, not to mention that I can view it at 16x speed. After so many years, don't we have any new technology for accurate identification? A computer

As a professional top student, is there nothing you can do?

Peng Ying smiled sheepishly: "Boss, do you even understand this?"

"I don't understand, can I be your leader?" Huang Yiwei asked rhetorically.

"Leave it to me. I'll go to Tianyang University first and copy all the videos in the relevant areas. Their video recorder system may have the function of accurate face recognition, but it doesn't work. I'm still here, but time is a bit tight.

." Peng Ying said.

"Time is tight, why don't we go quickly." Huang Yiwei patted Peng Ying on the shoulder, "Let Xiaodong drive and go with you."

Peng Ying agreed and walked out. Huang Yiwei sat in front of Peng Ying's computer and looked up Fang Guozheng's information.

The forensic doctor examined the frozen body again. The pinch marks under the neck were more obvious and a large reddish mark appeared on the chest. This also confirmed that the murderer may have pressed his knee on the deceased's chest in order to control the deceased.

Pi Peng repeatedly used a magnifying glass to observe the brick, which was almost the only physical evidence at the scene that could be extracted. But an hour later, nothing was found.

Dai Jiaxing walked into the trace examination room and said as he walked: "The blood stain examination report has come out. The blood stains on the bricks belong to the deceased. No other people's blood stains were found. What about you, any progress?"

Pi Peng glanced at him: "Fingerprints were found on it, and we can tell that the murderer is a male. The murderer wore gloves, so no fingerprints could be found."

"What? The biochemical weapon has failed, do we still have hope?" Dai Jiaxing said mischievously, and Pi Peng rolled his eyes at him.

Dai Jiaxing was not going to let him go: "Brother, fingerprints and footprints are all visual sensations. Do you only have vision? Taste, smell, hearing, and touch all have traces. You can try them all." Pi Peng thought thoughtfully, Dai Jiaxing

He was still joking there: "This is a brick. You can't listen to it, and you can't lick it. You can smell it like the dogs in our police dog team, like this." As he said that, he learned to smell like a dog.

The look of bones smells his own hands.

While Dai Jiaxing was still performing to his heart's content, Pi Peng suddenly picked up the brick and really smelled it.

When Dai Jiaxing saw this scene, he was shocked, stopped the performance, and in turn advised Pi Peng: "I said, biological and chemical weapons! No, old man, I was joking. I didn't really want you to smell-"

Pi Peng ignored him and picked up the deceased's dress and smelled it. Dai Jiaxing was completely shocked: "Old Pi, you are a pervert!"

Pi Peng ignored him at all, took the dress, ran outside the office door, and smelled it again. Dai Jiaxing was frightened and hurriedly chased him out: "Old Pi, I didn't mean it. Don't scare me, what's wrong with you?

"

Pi Peng handed the dress to Dai Jiaxing and said, "Jia Que'er, help me smell it. What does it smell like?"

Dai Jiaxing smiled awkwardly: "Old Pi, can you stop teasing me? I don't have that kind of hobby."

Pi Peng shouted seriously: "I'm not kidding! You smell it."

Not sure whether he was frightened by Pi Peng's weird behavior or thought he was right, Dai Jiaxing put his nose close to the dress, smelled it, and said half-jokingly: "The smell of earth, the smell of blood, and the smell of human DNA."

."

Pi Peng said with certainty: "That's not it. Smell it carefully."

Dai Jiaxing felt that Pi Peng was too serious, and his professional sensitivity told him that Pi Peng must have something to say. Dai Jiaxing organized his thoughts and smelled it carefully a few times. This smell really gave him a new feeling. He felt that it was above

There was indeed a familiar smell. He looked at Pi Peng, whose eyes were full of expectation.

He smelled it a few more times and said, "I'm very familiar with this smell. Where have I smelled it? At home? In the bureau? Laboratory? Dissection room?" Dai Jiaxing suddenly realized: "It's the dissection room, the smell of disinfectant, 84 disinfectant."

.There is the smell of 84 disinfectant on the bricks. You mean-"

Pi Peng pointed to the brick and the dress with his right hand: "There is the smell of 84 disinfectant on it. This means that the murderer wore a pair of gloves contaminated with 84 disinfectant. It can be inferred that there is 84 disinfectant in the murderer's work and living place. Maybe

It is a place disinfected with 84 disinfectant."

Dai Jiaxing was so happy that he patted Pi Peng on the shoulder: "Awesome, my brother. You are indeed our biological and chemical weapon. On behalf of all the police officers of the Technical Investigation and Serious Crime Team, I would like to thank you for your efforts!" It was as if he was the captain himself.

.

Pi Peng saw Huang Yiwei walking from the other side of the aisle, immediately stood at attention and shouted: "Team leader!" Pi Peng deliberately reminded Dai Jiaxing, but Dai Jiaxing did not understand.

Dai Jiaxing turned his back to Huang Yiwei and didn't notice. He thought Pi Peng was saluting him, and said in a serious manner: "Old Pi, when did you become so smooth? Don't tell me, one day I became a team member

"Captain, no, I have become the captain, so I will let you be the vice-captain." Pi Peng tried not to laugh out loud, it was very uncomfortable.

Huang Yiwei said behind Dai Jiaxing: "Dai Dui, let's have a meeting now, do you think it's okay?" Dai Jiaxing felt something was wrong. When he looked back, he was immediately petrified. Pi Peng, who had always been a man of few words, couldn't hold it in any longer.

, burst out laughing.

After Huang Yiwei finished speaking, he turned around and left. He couldn't help but laugh. He only heard Dai Jiaxing's complaining voice behind him: "You are really a biochemical weapon. You destroy the enemy and hurt your own people. Once you dig a hole, you will be a big enemy."

pit!"

Pi Peng made a rare joke: "Dai Dui, come to the conference room, we are having a meeting."

As night fell, after a busy day, everyone gathered together again. One day had passed since the time given by the director, and everyone canceled their rest and chose to work overtime. Huang Yiwei stood in front of the table and said: "Thank you for your hard work!

The deadline for solving the case is three days, and the time is limited, so we have to work overtime. There are elderly people and children at home who need to be taken care of. Let’s make arrangements now. Deputy detachment leader Li Qinggong bought us lunch boxes, chicken rice bowls, and mung bean soup. We won’t eat them today.

Instant noodles.”

Tan Hailong stood up and took the lead in applauding: "Thank you for the leadership. I swear to God that I will work well."

Yan Gang glanced at him and said disdainfully: "Hurry up and see God. If you go, I will be relieved."

Tan Hailong was a little embarrassed and defended: "I just expressed my feelings. I am a giant in words and a dwarf in actions." Tan Hailong sat down and poked Dai Jiaxing, "Jia Que'er, why are you so calm today?"

Dai Jiaxing glanced at Huang Yiwei, then at Tan Hailong, and said unhappily: "Get out of here! You are everywhere!" Tan Hailong sat there angrily and stopped talking.

Huang Yiwei cleared his throat: "The meal hasn't arrived yet, let's summarize the clues we got today. Whenever we encounter a problem to be solved, we will stop and discuss it at any time. From the discovery of the body to now, we have solved all the questions in order.

It starts with on-site investigation. Let’s crack it one by one. Starting with forensics.”

Cheng Liya stood up: "The deceased's dress was lifted up to his face. There were bruises on his lower body and chest, but his reaction to life was weak. It should be that the deceased was knocked unconscious and was molested when he was about to die. On the surface, it was suspected that he had been sexually assaulted, but

The autopsy found no trace of male DNA in the body of the deceased."

Tan Hailong said: "Sister Chengzi, are you saying that the deceased encountered a sexual pervert?"

Cheng Liya explained: "I don't mean that. Judging from this feature alone, it does seem like he encountered a sexual perversion. One thing is strange. The upper body clothes of the deceased have not been torn or opened. After Jiaxing's inspection, the surface of the clothes was also

No skin flakes or any other biological traces of the murderer were found, but there were bruises on the deceased's chest. The murderer wore

He was wearing gloves and did not take off the deceased's shirt. So my inference is that the murderer did not rape the deceased at all, nor did he molest the deceased. He just pretended that the deceased had been molested. The murderer's real purpose was to guide our investigation into sexual crimes.

to cover up the truth of his murder. Therefore, we see the current state of the deceased."

Ling Shuang cursed: "You bastard!"

Huang Yiwei reminded everyone: "The murderer had no need to cover the deceased's face with his skirt. What does this mean?"

Cheng Liya thought for a moment and said, "You mean, the murderer is an acquaintance of the deceased." Huang Yiwei nodded.

Peng Ying asked: "Why?"

Huang Yiwei said: "An acquaintance commits a crime. The murderer may feel guilty after seeing the death of the deceased, so he will use certain objects to cover the face of the deceased." Peng Ying nodded, and Team Yan agreed.

"I think what the team leader said makes sense, and it also explains a doubt in my mind. The deceased's injury was a fracture of the temporal bone. The temporal part had been hit repeatedly, leading to intracranial hemorrhage. The autopsy ruled out other causes of death, except strangulation.

Except that the neck injury could cause the deceased to become comatose, there was no more serious injury. Jiaxing’s forensic pathological experiments ruled out that the disease caused death. The deceased had chronic superficial gastritis and ulcers, but they were not enough to cause death.

Death. The composition of the liquid in the stomach was verified to be soda drink, and the toxicity test showed that it was not toxic. According to the examination of the trachea, lungs, heart and other organs, death by drowning was ruled out. There were no electric current spots in the body, and no abnormalities were found in the heart.

Excluding electric shock, it can be determined that the deceased's death was caused by a single cause of death, which was intracranial hemorrhage due to temporal bone fracture. The time of death was probably around 1:00 in the morning." Cheng Liya said the time of death.

Peng Ying said: "The surveillance video around the crime scene shows that the deceased entered the avenue next to the grove at 11:50. After that, she never came out again until the incident, and she never saw anyone else coming out. The deceased should be

He came in through the school gate, then took a shortcut back to the dormitory, and was killed while passing through the woods next to the avenue."

Li Jianqiang said to Han Wenjun: "Xiao Han, please tell me the movement trajectory of the deceased."

Han Wenjun drew a schematic diagram of the deceased's movements. She pointed the route with a laser pointer and said: "The deceased met her boyfriend under the statue of Qian Xuesen in the square in front of the Wuxin College building that day, and then walked out of the school gate along the avenue.

I turned left and bought a bottle of soda at the roadside store. I had confirmed with the owner of the store that he was about to close at that time, so I had an impression of the deceased and his boyfriend. They sat in the park in the middle of the street for an hour, and then

Walking back to the school slowly, the deceased entered the school alone."

Peng Ying added: "They met at 10:08 and left the school at 10:20. The surveillance video on the street has not been retrieved. At present, it can only be found here."

Han Wenjun continued: "The walking route and scope of activities that night were consistent with the description of the deceased's boyfriend, and consistent with the evidence we obtained. The deceased decided to get a marriage certificate with her boyfriend. The boyfriend had no motive for killing, so it should be ruled out."

Team Yan raised a question: "This can only prove that the boyfriend's motive is insufficient. It is only the boyfriend's unilateral statement and cannot be verified by the deceased. After the deceased entered the campus, the boyfriend still did not have an alibi, which cannot prove that the boyfriend was not present when the crime occurred. If

To rule out his suspicion, more powerful evidence is needed, and we cannot just listen to his one-sided words.

"Yes, I will implement it again." After Han Wenjun finished speaking, he sat down.

Huang Yiwei said: "Entered the campus at 11:50 and was killed around 1:00 in the morning. For about an hour, it can be inferred that the victim was not killed as soon as he entered the boulevard. After the victim entered the boulevard, he encountered a man who had been waiting there for a long time.

The murderer. Judging from the time, they did not clash immediately, but talked for a while, and then the murderer killed the victim. Combined with the fact that the face of the deceased was obscured, the murderer is likely to be an acquaintance."
To be continued...