Serious Crime Unit 1

Chapter 1225 The Poison of Love (2)
"Thank you, Brother Kai!" She smiled lightly at him and handed the fingerprint powder to Xiao Ke.Usually fingerprint powder consists of colorants and resin polymers or inorganic salts, and of course there are more types of fingerprint powders.Such as gold powder, silver powder and magnetic powder.Gold powder is copper powder, silver powder is aluminum powder, and magnetic powder is a mixture of carbon powder and iron powder.For gold and silver powder, you can use an ordinary brush, while for magnetic powder, you need a special magnetic brush.

At this time, both Luo Jin and Wu Jiang walked out of the scene and told Jiang Yiming that the scene investigation was completed. Jiang Yiming nodded and asked Luo Jin to call the body collector to transport Li Dacheng's body back to the Municipal Bureau Forensic Center for autopsy.Luo Jin took out the "Autopsy Consent Form" and handed it to Liang Nuanyu and asked her to sign it.

After Liang Nuanyu took it, she looked at it for a while, then took the pen handed over by Luo Jin and signed her name on it.

Jiang Yiming asked Liang Nuanyu to find a place to live, and they wanted to seal off the scene.Liang Nuanyu: "I don't want to live at home anymore. Everything I see at home will bring back sad memories. I will go back to my parents' home."

Jiang Yiming and everyone gathered together.

Li Dacheng's death has not yet been determined, so Luo Jin can calmly do the autopsy work. He took his assistant Dong Dawei to start the autopsy. They first inspected the surface of the body, shaved the body's hair, and took out a magnifying glass to observe the scalp. The result was no Wounds found.

The neck, chest, abdomen, back, and buttocks were then examined, but no wounds were found.When Dong Dawei examined his calf, he found an extremely small wound with a diameter of about 0.08 mm, which is equivalent to a mosquito's mouth.He asked Luo to come in and take a look.

Luo Jin looked at it and said, "This small wound should be caused by a mosquito bite."

"Mosquito bites? Oh..."

"You seem to have a different opinion?"

"Huanan Community is a famous high-end community in our city. Houses cost up to 12 yuan per square meter. The property management is very strict, the greening rate is high, and it is very clean. There are unlikely to be mosquitoes, right?" Dong Dawei knows the situation of Huanan Community very well, because His sister and brother-in-law lived there.

"Don't mosquitoes have wings? They will fly into the scene."

"Master, I know mosquitoes can fly, but as far as I know, under normal circumstances, mosquitoes can only fly up to 16 to 20 meters. The scene is on the 19th floor, which is about 60 meters high. Mosquitoes cannot fly up because It’s windy on the 19th floor.”

"Oh, I really don't understand this... But I know that it only takes about 10 days for mosquito eggs to grow into mosquitoes. If there is a sanitary dead corner on the 28th floor, mosquitoes will grow, so it is possible for mosquitoes to fly into Li Dacheng's house and suck his blood. possible."

"No, this is unlikely. Because of the COVID-[-] pandemic, every house in Huanan Community must be disinfected once a week. They hired a professional disinfection company. The work is very rigorous and in place. There are no dead ends. Therefore, there are The possibility of mosquitoes is extremely low." Dong Dawei insisted on his opinion.

Luo Jin has two capable assistants, one is Dong Dawei; the other is Liang Ying. He prefers Dong Dawei because he has his own unique way of thinking and can boldly ask questions, while Liang Ying rarely asks Luo Jin questions. , will only work silently.

"If it's not a mosquito bite, is it possible it's a needle hole?"

"Needle eye? As far as I know, the smallest needle tube in the hospital has a diameter of only 0.2 mm. Are there any smaller needle tubes?"

“I know that at the second China International Import Expo, a pharmaceutical company in Japan manufactured a needle with a diameter of 0.12 mm, which was mainly used to inject insulin into patients. That was in the summer of 2019. Now three years have passed. Technology is advancing rapidly, and the possibility of producing a 0.08 mm needle is very high... Do you think someone used a small needle to inject poison into Li Dacheng while he was sleeping?"

"No, I'm just analyzing whether the small holes on the body were bitten by mosquitoes."

"We will find out after we open the body and examine it."

After they cut open the cranial cavity, chest cavity, and abdominal cavity, they examined the organs in detail.Luo Jin found a small amount of bleeding in the deceased's nasal cavity and respiratory tract, and found many bleeding points in the lungs and heart. At the same time, he had kidney failure, which was very similar to symptoms of poisoning.

Luo Jin took out a medium-sized syringe, drew Li Dacheng's blood into the syringe, injected it into the test tube, and sent it to the laboratory for testing. Once the test is done, it will be known whether Li Dacheng died of poisoning.If it is a relatively rare toxin, the test will take a little longer. If you encounter the latest toxin, you can't even tell what type it is because there are no comparable samples in the database.

Luo Jin is the director of the laboratory, but under normal circumstances, the business is managed by the deputy director Meng Xia. There are six people in the laboratory, four women and two men. Meng Xia is a man. He is 6 years old this year. A top student who graduated from the Department of Chemistry of the Provincial Polytechnic Institute, he works seriously and rigorously. In addition to his daily work, he is also researching various new poisons.Luo Jin handed Li Dacheng's blood sample to Meng Xia and explained the situation. Meng Xia promised to take the blood sample for testing as soon as possible and get the results as soon as possible.After saying that, he turned around and went to work.He is the kind of person who talks little but is very pragmatic. He never wants to please Luo Jin and spends all his energy on business, which makes Luo Jin admire him.

On the third day, after Luo Jin's autopsy report came out, he walked into Jiang Yiming's office and handed the autopsy report to him.After Jiang Yiming read the corpse report, he frowned and asked, "Did Li Dacheng die of poisoning?"

"Yes, Li Dacheng died of Taipan snake venom poisoning. Taipan snake venom is one of the most venomous snakes in the world. The toxin it produces can kill nearly 20 tons of prey in one bite, which is equivalent to hundreds of adults, or even Even African elephants cannot withstand its venom."

"So poisonous? This is the first time I've heard of how the toxin entered Li Dacheng's body?" Jiang Yiming was slightly surprised when he heard this: If this was a murder, the murderer must be a rich man.The cases of capital-backed murderers are very complicated.

"It's written in the autopsy report."

"I haven't looked carefully yet, you can tell me faster."

"Taipan snake venom is injected from a needle with an inner diameter of 0.08 mm. Taipan snakes are only distributed in the plains or deserts of Australia and New Guinea islands. Taipan snakes have not been found in my country yet. This toxin should have entered our country from Australia. It can be absorbed through the skin, and if the toxin is applied to underwear, the wearer will definitely die because it can kill within 3 minutes after entering the human body.”

"Do you think Li Dacheng committed suicide or committed homicide?"

"It should be a homicide. If you commit suicide, you don't need to buy a 0.08 mm needle to inject the toxin. Such a thin needle is expensive and difficult to buy in China. If Li Dacheng wants to commit suicide, he can quickly die by drinking 0.01 ml of the toxin, or use Ordinary needles... No, no needles are needed. He only needs to take out a needle, dip it in the toxin, and then prick it gently on the skin to complete his suicide. Why go abroad to purchase a needle with an inner diameter of only 0.08 mm? ?”

"Micro needles and Taipan snake venom... this can only be done by rich murderers. A case must be opened and investigated, and Li Dacheng cannot be allowed to die unjustly!"

"Captain Jiang, an overdose of alprazolam was also detected in Li Dacheng's blood sample. This is a clue."

"Let's call everyone for a meeting first to discuss the case." After Jiang Yiming finished speaking, he stood up, walked to the office area, and informed everyone to meet in a small conference room.

2
Everyone sat in the air-conditioned conference room for a meeting. Jiang Yiming distributed the autopsy report to everyone. After they read it, he said: "According to Luo Jin's analysis, this was a clever murder case. After everyone read the autopsy report, there are What do you think? Please analyze it carefully and express your opinions. Does anyone have any objections?"

Everyone said they had no objection. There were countless better ways to commit suicide. Why would Li Dacheng use such a costly and complicated method?
"Old Wu, have you found any suspicious traces at the scene, such as shoe prints or fingerprints that are different from the two owners?" Jiang Yiming asked.

"Only two types of shoe prints were extracted from Li Dacheng's bedroom, one for a woman and one for a man. I have compared the slippers worn by Liang Nuanyu and Li Dacheng. These two shoe prints are from their husband and wife. Three kinds of fingerprints were also extracted, one is from a woman, and the other two are from a man and a child. I think they belong to Li Dacheng and his son Li Ziqing. I don’t know if it was a homicide, so there is no comparison." Wu Jiang said.

"Are there any other marks, such as the marks left by friction between slippers without pattern soles and the wooden floor?"

"No, the scene is very clean and it is a secret room. However, Liang Nuanyu said that when Li Dacheng went to bed, he closed the bedroom but did not lock it. This was his habit for many years so that Liang Nuanyu could ask him to have breakfast and they could divide it. It’s been three years since I slept in this bed.”

"This is strange: Could it be that the murderer grew wings and flew into Li Dacheng's bedroom, and then injected him with Taipan snake venom?" Jiang Yiming asked doubtfully.

"It is impossible for the murderer to have wings and fly in. I saw a pair of slippers on the shoe rack that were the same style as the ones Li Dacheng wore into the bedroom. The soles were also the same, except that one pair was black and the other was white. The white slippers were placed on the shoe rack. On the shelf, if the murderer wore white slippers and entered the scene to commit the crime, then the shoe prints left at the scene would be the same as Li Dacheng's." Xiao Ke answered.

"Well, it's possible... Xiaorou, tell me about the distribution of the monitors at the crime scene. By the way, tell me about the door lock situation of Li Dacheng's house." Jiang Yiming turned his eyes to Wen Xiaorou.

"The monitoring facilities in the 28 buildings of Huanan Community are relatively complete. High-definition monitors are installed in the lobby and elevators. However, there are no monitors in front of Room 1902 because the case has not yet been determined. Therefore, we have not checked the surveillance video, but I have installed the monitors in the lobby and elevators. The surveillance video of the elevator within 48 hours has been copied back... The door lock is a Sakura brand smart electronic lock, and I have not checked the door lock switch record."

(End of this chapter)