Serious Crime Unit 1

Chapter 260 Carbon monoxide poisoning (3)
"Is it possible that the murderer wore a gas mask, opened the valve of the gas tank, and let the liquefied gas leak until he poisoned Liu Xishan to death, then closed the valve and then closed Liu Xishan's kitchen door, so that when Liu Xishan entered, He was surrounded by liquefied gas and died from inhalation poisoning," Zhou Ting said.

"This should be impossible. First, because the odor of liquefied petroleum gas is very strong. As soon as any adult smells the smell, he will know that the liquefied petroleum gas is leaking and will immediately turn off the valve; secondly, if the kitchen is full of liquefied petroleum gas, Liu Lushan When you enter the door and turn on the light switch, the liquefied gas will burn and explode due to the sparks generated by the switch. Thirdly, the density of liquefied gas is less than that of air and it is easy to volatilize. The method of killing with liquefied gas will not work. Unless the deceased is seriously drunk or While sleeping." Luo Jin said.

"I extracted two fingerprints from the switch of the liquefied gas valve. I initially judged that one belonged to Liu Xishan; the other one can be seen from the cross section of the fingerprint: this person's fingers are slender and the fingertips are not big, so he should be female. . But no fingerprint matching it was found in the fingerprint database." Xiao Ke said.

"Old Wu, tell me." Jiang Yiming relied heavily on Wu Jiang. Wu Jiang was born in 1970. He has been engaged in criminal investigation for more than 20 years, solved countless cases, and has rich experience and judgment.

"Three shoe prints were extracted at the scene. After comparison, one of the shoe prints was Liu Xishan's, and the other two shoe prints were of size 37 sneakers and size 36 high heels, which should be women's. I also checked the glass in the kitchen Four fingerprints were extracted from the door, one of which belonged to Liu Laoshan; the other three belonged to three women, and one of the fingerprints should belong to Gu Guohua. If this is a murder case, then these two shoe prints and Two fingerprints are very good clues," Wu Jiang said.

"Old Wu, do you think this is a murder?"

"It's too early to draw conclusions now, but we must find out where the carbon monoxide comes from. Luo Jin, is there any alcohol or narcotics in Liu Xishan's body?" Wu Jiang turned to ask Luo Jin.

"No, it's normal."

"In other words, Liu Xishan was poisoned and died without knowing it?"

"um, yes."

"But the kitchen doors and windows are closed and all doors and windows are intact. Unless an acquaintance opens the door with a key and enters, he cannot enter the kitchen to release carbon monoxide. How could it be a homicide?" Lu Yingying said.

"What if the murderer released carbon monoxide from the exhaust pipe of the range hood into the kitchen?"

"There is a possibility that human life is at stake. In the spirit of humanitarianism and defense of the law, we must give an explanation to the deceased and his family! When we return to the scene, we must find out where the carbon monoxide came from. Lao Wu and Zhou Ting went to Liulishan We checked outside the kitchen to see if we could find any traces. Xiao Ke and Yingying then went to the kitchen to search for the source of carbon monoxide," Jiang Yiming said.

The four of them came to Linjiang Community together, and Xiao Ke and Lu Yingying entered the scene to investigate again.Zhou Ting and Wu Jiang came to the outside of Liu Xishan's kitchen. Outside the kitchen was a muddy field with sparse weeds. They first blocked it off with a cordon, and then entered the muddy ground to conduct investigation.The blocked land was 5 meters long and 4 meters wide, totaling 20 square meters. The criminal police called it an "extended site."

The extension site was inaccessible, filled with sewage, and scattered with cigarette boxes dropped by residents from upstairs, silk stockings blown off by the wind, peanut shells and other debris. They were afraid that the traces would be damaged by themselves, so they put on their standard equipment when surveying the site. Take out a magnifying glass and look carefully for any clues.I checked for nearly an hour and found nothing.

After the Mid-Autumn Festival, it began to rain continuously in the Yangtze River. It rained lightly in the morning of October 10st and turned cloudy after noon. If someone walks into the extension site, they will definitely leave shoe prints on the wet ground, unless the suspect is using a Entered by a special method.For example, he was hung from the rooftop with a rope on the outer wall of Liu Xishan's kitchen to commit the crime.But this possibility is very small, because Liu Xishan died in the evening. If the suspect brought a carbon monoxide bottle to release poisonous gas in the kitchen, it should be done during the day. Then the risk of the suspect being witnessed is very high, because there are dozens of houses across from the kitchen. Residents, with two to three hundred pairs of eyes staring at him, the suspect would not be so stupid.

The only outlet on the outer wall of the kitchen is the exhaust outlet for oil fumes. The exhaust outlet is small, round, about 10 cm in diameter, and a slightly smaller exhaust pipe passes through it. Originally there should be no exhaust outlet, but later a range hood was installed. It was just opened, otherwise, it would not be exactly the size of the exhaust pipe of the range hood.

If carbon monoxide was artificially introduced into Liu Xishan's kitchen, then the only place for air intake would be the exhaust port.Wu Jiang walked out of the extension site, came to the survey vehicle, took out the telescopic aluminum ladder, carried it to the wall, then pulled it open, put it under the exhaust port, and climbed up along the aluminum ladder to check.

The exhaust pipe of the range hood was full of oil fume, but the oil smoke pipe was very dry, indicating that Liu Laoshan had not cooked for a long time.If someone wants to transport carbon monoxide from the exhaust pipe to the kitchen, the leather pipe must be connected to the carbon monoxide bottle, and then inserted into the exhaust pipe until it touches the body of the range hood. Then, the leather pipe will definitely come into contact with the exhaust smoke. Once the pipe comes into contact with the inside of the exhaust pipe, it will leave scratch marks. However, the oil smoke measured inside the exhaust pipe is evenly distributed, leaving no scratch marks.

Wu Jiang was afraid that he could not see it with the naked eye, so he took out a strong flashlight and a magnifying glass to inspect it. After looking for a long time, he still found no trace of scratches, so he moved the aluminum ladder to another wall and observed the outer wall to see if it had been stepped on. No traces were found.

After Wu Jiang and Zhou Ting finished working, they came to the kitchen and asked Xiao Ke and Lu Yingying what they had discovered.Xiao Ke said: "Apart from the smoke exhaust vent, the only thing that can lead to the outside is the floor drain. The floor drain leads to the underground drainage channel. I asked the landlord and she said that the drainage channel was dug in the late 80s. It is very small, and there is a lot of sludge deposited. It will be blocked when it rains heavily. The property company often hires people to clear it. Therefore, the possibility that the suspect wants to discharge carbon monoxide from the drainage channel is very small, because once carbon monoxide is discharged from the drainage channel, The residents in the building may be poisoned throughout the night, and the vast majority of murderers will not be so crazy as to kill innocent people indiscriminately."

"Well, that makes sense." Wu Jiang answered him. "Angkor, have you found anything?"

"No." Wu Jiang was slightly disappointed.

"Maybe it was an accident rather than a case."

"But where does the carbon monoxide come from? This needs to be clarified, otherwise I will always have a knot in my heart."

"Could this be the second scene?"

"Are you saying that the suspect poisoned Liu Xishan elsewhere and then moved his body here to create the illusion that Liu Xishan died of poisoning in the kitchen?"

"Yes, I think it's possible, otherwise it doesn't make sense."

"Your idea is new. We must get to the bottom of it, otherwise we will be sorry for the deceased." Wu Jiang said firmly.

4
Wu Jiang and Zhou Ting drove to Haitian Community. Through the security guidance at the door, they came to the elevator entrance of Houfu Building where Liu Liushan's parents lived. They took the elevator to room 1802 and rang the doorbell. The person who opened the door was Liu Liushan. Mother Ou Baohuang, Ou Baohuang and her husband Liu Tianqi went to the forensic room to identify the body three days ago, so she knew Wu Jiang and Zhou Ting.

Ou Baohuang just retired this year and lost her son in old age, causing her hair to turn gray overnight.Her voice was hoarse, her expression was tired, her eyes were black, her tears were deep, and her feet seemed to be filled with lead. She dragged herself on the floor to the sofa and sat down. She picked up two water glasses from the coffee table to fill them with water, but Was stopped by Wu Jiang.Wu Jiang took her water glass, walked to the pure water bucket, filled three glasses of water, and placed them on the coffee table.

Zhou Ting looked around the living room. The living room was very large, nearly 50 square meters. It was exquisitely decorated and equipped with all kinds of electrical appliances. It was very different from Liu Lushan's residence.Why doesn't Liu Xishan live in a gorgeous and comfortable home but in Linjiang Community?Liu Xishan owns a semi-old modern car. It only takes half an hour to drive back to Haitian Community from the timber market. Is there any conflict between Liu Xishan and his parents?

"Aunt Ou, why does your son not live at home but rents in Linjiang Community?" Zhou Ting asked.

"Hey, firstly, this child is very independent and wants to make his own way in the world; secondly, he has different values ​​​​and outlook on life from his father, and they often quarrel over trivial matters. For the sake of freedom and anger, Laoshan moved here three years ago. Go and live in Linjiang Community. It’s all my fault that my old man won’t tolerate his children, otherwise there wouldn’t be an accident in Laoshan..." At this point, her tears fell like pearls to the floor.

Wu Jiang took out a few pieces of paper from the paper box on the coffee table and handed them over, asking her to wipe away her tears. After a while, Ou Baohuang calmed down. Wu Jiang asked, "Has Liu Liushan ever offended anyone?"

Ou Baohuang was suddenly startled: "What's wrong? Did my son commit suicide?" Her brain reacted very quickly, unlike a retired aunt. Generally, middle-aged and elderly people are not so sensitive.

"No, this is a routine investigation. There is currently no evidence that Liu Xishan committed suicide. Do you know who hates Liu Xishan the most?"

"My son never told me who he was dating, but one time he said he would bring his girlfriend home for my wife and I to get to know each other, and we agreed. He then brought his girlfriend to meet us, and his father watched She looked like a prostitute, so I asked her where she worked. She said she was a manager at Phoenix Nightclub. His father didn't believe it, so he inquired about her through friends, and found out that she was the mother of Phoenix Nightclub. His father and I were firmly against them. The relationship continued. I begged my son to leave her. After half a year of persuasion, my son finally agreed to break up with her."

"what is her name?"

(End of this chapter)