Chapter 822: 822
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Detection room.
When Gu Chen finished extracting the dirt from Wang Jinshan's fingers, he Wenjun stepped forward and asked, "do you know what this is?"
"It's hard to say yet." Gu Chen sealed the small transparent forensics bag and marked the number on the label paper. Then he said: "further detection is needed because these dirt are in powder form. At least I need to test before I know."
Looking at Gu Chen's suspicious look on his face, Liu Zhiqiang on one side asked, "is the dirt in the nail gap left by Wang Jinshan when he scratched?"
"Maybe." Gu Chen said very simply, but he sighed.
This attracted the attention of he Wenjun.
He Wenjun asked Gu Chen, "what are you feeling? Is it because the dead knew you? "
Gu Chen shakes his head: "not really."
"And why are you?" When he Wenjun heard the speech, he felt that there was something in Gu Chen's words.
Gu Chen didn't answer immediately. Instead, he put the evidence collection bag on the parallel detection platform, and then turned to he Wenjun and said:
"you speculated that the dead Wang Jinshan died of drunken swimming. I don't think so, because according to the time of death, he Wenjun died in the early hours of last night."
"But you know, the last time I saw Wang Jinshan was dinner time."
"He was drunk at that time, but after we gave him milk, his condition began to improve gradually."
Looking around for a week, Gu Chen said again: "when he left, his consciousness began to wake up gradually."
"But in such a state, how could he possibly drown in the swimming pool in the early hours of the morning?"
"Unless there is one possibility, that is, he drinks again at home, so I would like to ask, have you found any traces of Wang Jinshan drinking in his home?"
"This..."
When Gu Chen suddenly asked, he Wenjun was stunned and shook his head: "it's not found. It's just that Wang Jinshan once drank alcohol last night, so we just make a general guess."
"That's uncertainty." Gu Chen affirmed.
Liu Zhiqiang frowned and turned to ask Gu Chen: "officer Gu, how do you know that the death time of the dead Wang Jinshan was around the early morning of last night? How can you conclude that it was the early morning of last night when the teacher has not reached a conclusion yet
"Don't judge." Before Liu Zhiqiang finished speaking, instructor Zhang Hui stood up straight and took a deep breath: "Gu Chen is right. The time of death is really around the early morning of last night."
"Really Really? " Liu Zhiqiang was a little unbelievable. He turned to Gu Chen and said, "but Gu Chen just came in a short time ago. He just observed the corpse. How could he tell the time so quickly? "
After looking at Zhang Hui, Liu Zhiqiang said: "even you, Mr. Zhang, have not completed the comprehensive test. This How could he... "
"I don't know, but he's right." Zhang Hui shook his head and laughed, turned to look at Gu Chen and asked, "Gu Chen, how do you know the time of death of the dead? I just finished testing the specific features. "
"And you just scraped the dirt from the fingernails of the dead Wang Jinshan, and you can determine the time of death?"
"Of course not." Gu Chen directly shook his head and explained, "in fact, to identify the cause of death of the deceased, I also judge according to previous experience."
"Experience?" He Wenjun was somewhat surprised. After all, autopsy work has always been done by the forensic team.
Gu Chen is not a forensic doctor, but he talks about experience here?
He Wenjun felt a little inconceivable.
Gu Chen pressed the corpse with his fingers to show them: "in fact, to judge the time of death, you can generally determine it in three directions. The first thing is to see the stiffness of the body."
"That's right." Instructor Zhang Hui agreed with Gu Chen's opinion and nodded slightly: "this is a way that our forensic doctors usually use to detect corpses."
After seeing Gu Chen, Zhang Hui asked again, "what is your standard of judgment?"
"It's simple." Gu Chen poked the corpse with one finger and said: "generally, the body will harden between 30 minutes and 2 hours after death, completely ossify from 9 hours to 12 hours, soften after 30 hours, and return to its original state after 70 hours."
Seeing Zhang Hui nodding slightly, Gu Chen said again: "but it is worth noting that if it is in the soil or water, or in the case of low-temperature drying, it will be delayed, and it will be accelerated under high-temperature and humid conditions."
"I also made my judgment based on these bases and some previous experience."
"Well." Zhang Hui was very satisfied with Gu Chen's answer.
Before I used these data to compare the corpse, infer that Wang Jinshan's death time may be in the early morning.
But Gu Chen can also judge with a very fast speed, which makes Zhang Hui look at Gu Chen differently.
He Wenjun and Zhang Zhiqiang also have a special eye on Gu Chen.
The two men and Gu Chen are colleagues, but for autopsy, most rely on the forensic team.However, being surpassed by the young colleague in front of us, we are somewhat embarrassed.
Liu Zhiqiang couldn't help joking: "it's quite reasonable. Besides this, what basis can you use to judge the time of death?"
"Too much." Gu Chen pulled up his finger to explain to the crowd: "and according to the body temperature to judge."
"Generally speaking, the body temperature drops by 1 degree per hour within 10 hours after death, and by 0.5 degrees per hour over 10 hours after death."
Hearing Gu Chen's remarks, he Wenjun and Liu Zhiqiang look at Zhang Hui together.
Zhang Hui also nodded in silence, agreed with Gu Chen's words. In his heart, he calculated the corpse according to the data provided by Gu Chen.
"So You just took the tool, in addition to extracting the dirt from the crevices of the corpse's nails, you also carried out temperature detection? "
"That's right." Gu Chen nodded slightly and admitted: "it was true that the temperature detection was carried out on the body just now, otherwise it would be difficult to judge the situation of the body."
"Is there another direction?" Zhang Hui realized at the moment that Gu Chen seemed far less simple than he imagined.
It seems that this guy is quite familiar with forensic work.
Gu Chen directly blurted out: "there is also according to the person died, in the body under the skin of the purple plaque, that is, to judge the corpse."
"Because the plaque usually appears at 2 to 4 hours after death, reaches its maximum height after 12 to 14 hours, and is fixed at 24 to 36 hours without metastasis."
"However, the occurrence and development of general corpse phenomenon are greatly affected by internal and external factors, so we should objectively analyze all the conditions."
"That's great." Zhang Hui chuckled and said: "Gu Chen, I didn't expect that you could judge the time of death of the dead by simply passing these conditions. It's very rare. It can be seen that you don't have to work hard at ordinary times."
"Of course." Seeing the instructor Zhang Hui began to praise Gu Chen, Lu Weiwei was pleased to look out and say: "instructor Zhang, I have long said that Mr. Gu knows more about this business, but you don't believe it."
"No, No Zhang Hui interrupted Lu Weiwei and said, "it's not that I don't believe it. It's just that Gu Chen is too young. According to the law, he is not very familiar with the autopsy business."
"In my opinion, at least, young forensic doctors have some problems in testing."
"Maybe there are some people of the same age who can accurately determine the cause of death like Gu Chen, but those who can make preliminary judgment as quickly as Gu Chen are very rare. At least I haven't met them yet."
"It's pretty good." Liu Zhiqiang had to admire him. Even Zhang Hui was full of praise for Gu Chen. It can be seen that Gu Chen's business is solid, which is indeed extraordinary.
Such a variety is rare in the police force.
He Wenjun also said with a smile, "Gu Chen, are you so familiar with these forensic work? No wonder you have to rush to Mr. Zhang to help. You were really despised just now. "
"I didn't mean to rush here to help." Without waiting for he Wenjun to finish speaking, Gu Chen directly interrupted: "it is mainly because the dead have contacted me, and I still know some of his conditions."
"Coming here may give you some ideas on how to handle cases, so That's what I came to the lab for. "
Hearing Gu Chen's words, he Wenjun and Liu Zhiqiang look at each other, and they can't help but thumbs up.
"It seems that you have come to the right place. Welcome to the case handling team. I hope you can help us as much as you can in the testing room."
He Wenjun had doubts about why Gu Chen appeared here?
But now he Wenjun has no opinion on Gu Chen.
Gu Chen also nodded slightly to express his thanks.
At this time, Zhang Hui with Gu Chen extracted nail dirt, ready to test in the detection platform.
"If Wang Jinshan drowns in his own swimming pool, the dirt will have some problems unless it is on him," Wang said
"It's not a problem, it's a big problem." Gu Chen pointed out directly for officer Wang: "the dirt in my opinion is more like some soil, sand and gravel and plant debris."
"You mean..."
Hearing Gu Chen's words, he Wenjun frowned slightly.
"That's right." Gu Chen did not shy away, and said bluntly: "when people are drowning, they will try their best to catch anything around them and try to survive."
"Therefore, drowning people often cling to soil, small stones and plants in their hands. They can also be found in their fingernails. These things can also be used to determine the exact location."
"If a body is found in a swimming pool, then if the forensic autopsy finds debris not found in the pool in the lungs or nails of the deceased, it is possible that the victim was drowned elsewhere and later abandoned in the pool, pretending to be an accidental drowning incident."
"Brother Gu means The swimming pool in Wang Jinshan's home may not be the first scene? ""Yes, that's what it means." Gu Chen nodded slightly, but also said faintly: "if we can compare the specific origin of the substances contained in the debris, such as pollen, feather seeds, etc., it may be that the dead person drowned there."
"You have a point." He Wenjun agreed with Gu Chen.
However, as a colleague, he Wenjun couldn't help saying more. By the way, he educated Liu Zhiqiang around him:
"in fact, during autopsy, can you tell where the drowning person drowned? For example, in the bathtub or in the river? "
"If you can, to what extent, you need to carefully examine the dead. Gu Chen just scraped the dirt from Wang Jinshan's fingers, which is a good method."
"Yes." Gu Chen nodded slightly. He also removed the contaminated gloves and threw them into the garbage can around him. Then he said again:
"when a person is drowned, he will inhale the water and the substances in the water into his mouth, nose, throat and lungs."
"And these include leaves, insects, seeds, pollen and other debris."
"If you drown in a river or other natural waters, it is possible that the animal and plant materials found in the lungs of the deceased may be specific to some area."
"It's like finding pine pollen or pine needles in the lungs, which means that the victim drowned in a place near the water where pine trees grow."
"It is also true to replace it with other trees and other plants."
After a pause, Gu Chen added: "insects also have specific distribution areas, so finding insects in the lungs can also indicate a specific place."
"All the tests are consistent with changes. It's right to follow this standard."
"But..." Hearing this, Liu Zhiqiang hesitated and asked Gu Chen, "but the water in the pool is usually quite clean, so can't we find other clues?"
"It's OK." Gu Chen seamless docking, direct way: "swimming pool water is usually quite clean, but most of the chlorine, but this can be tested."
"Natural waters are completely chlorine-free. As early as the 1960s, humans probably did this test, but it's not common."
Looking at Liu Zhiqiang's thoughtful look, Gu Chen said, "so the water in the bathtub should be clean and chlorine free, but it may contain some soap or grease, which can also be tested."
"So the substance in the inhaled water can often be used to help determine the position of drowning."
"I see. No wonder Mr. Zhang asked us to extract water samples from the swimming pool. That's why."
"Ha ha." Listening to Gu Chen's explanation to these two people, Zhang Hui, sitting on the testing platform, could not help laughing, but also reminded him: "you may have forgotten me, and forgotten what I am specialized in."
"How can it be?" He Wenjun glanced at Zhang Hui, but also took the initiative to show his kindness: "you are an expert in diatom detection, which line would you like to cooperate with?"
Zhang Hui on the detection platform smiles, is also joking and said: "this you do not rely on me is really not good."
"Since the German scientist revenstorf used a microscope to detect diatom from lung drowning fluid in 1904, forensic workers at home and abroad have conducted in-depth research on diatom detection methods."
"But in fact, you don't know that China began to test and study diatoms in the 1930s."
"Up to the 1960s, six provinces and autonomous regions in central and southern China had carried out joint research on how to improve the detection rate of diatoms. My father was one of the members of the diatom detection team."
"So it is?" Lu Weiwei was also surprised, not make complaints about it: "Zhang was a forensic family. All of them eat this bowl of rice. "
"Ha ha, it's OK. It's mainly influenced by my father." Zhang Xuehui doesn't care about it.
But it doesn't matter. Gu Chen couldn't help but directly answered: "yes, I've read the relevant documents, but I didn't expect that there was instructor Zhang's father in this early diatom detection team."
"It was a long time ago, not to mention it now." Instructor Zhang Hui after testing a sample, and then another sample out.
Gu Chen is a light said: "I remember in 1998, Canadian forensic pathologist, Michel Bergen, in his book" forensic diatom and drowning ", for the first time comprehensively discussed the scientific nature and forensic principles of diatom test."
"I also read that book a few months ago. In the book, the author proposed the concept of forensic diatom, including the principle, effectiveness and practicability of diatom test in the diagnosis of drowning, as well as the methods and procedures of diatom test."
"Because diatom has gradually been recognized as the most reliable marker for the diagnosis of drowning, diatom testing is also generally considered to be a more reliable means of diagnosis of drowning. Especially for the diagnosis of the cause of death of decaying corpses in water, it is regarded as the most effective method, which can be called the" gold standard. "
"This is a great improvement compared with the previous backward detection methods and rough experiments."After a pause, looking at Liu Zhiqiang and he Wenjun, Gu Chen said again: "when a person drowns, diatoms in the drowning fluid will break through the alveoli and enter the human body's blood for circulation, and along with the blood flow of the drowning death, it will be distributed to the brain and various internal organs."
"Therefore, today's diatom detection technology, mainly through the identification of the presence of diatoms in the body of the dead."
"If the analysis and identification results of diatom examination technology in visceral organs of the dead body are positive, and the species of diatoms are consistent with the water samples in the field, the death of the deceased can be determined as drowning."
"Now Wang Jinshan's body needs to be verified."
"However, there are many kinds of diatoms and their forms are different. The diatoms in each water source are not the same." Instructor Zhang Hui side head glanced at the eye Gu Chen, is also the scene test.
However, Gu Chen blurted out and said seamlessly: "yes, there are many kinds of diatoms, but diatoms are single celled organisms widely distributed in water. The cell wall is composed of a large amount of silica, which is extremely stable and hard."
"Therefore, the qualitative and quantitative analysis of diatoms in the main organs of corpses in water can not only directly determine the cause of death, but also point to the possible drowning sites."
"Bang!"
Gu Chen's voice just fell, instructor Zhang Hui's arm touched the tray where the utensils were stored, and it was banging for a while.
"Instructor Zhang, are you ok?" Gu Chen's eyes are attracted.
Zhang Hui waved his hand: "it's OK, just found some anomalies, so I accidentally touched the tray."
……
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Detection room.
When Gu Chen finished extracting the dirt from Wang Jinshan's fingers, he Wenjun stepped forward and asked, "do you know what this is?"
"It's hard to say yet." Gu Chen sealed the small transparent forensics bag and marked the number on the label paper. Then he said: "further detection is needed because these dirt are in powder form. At least I need to test before I know."
Looking at Gu Chen's suspicious look on his face, Liu Zhiqiang on one side asked, "is the dirt in the nail gap left by Wang Jinshan when he scratched?"
"Maybe." Gu Chen said very simply, but he sighed.
This attracted the attention of he Wenjun.
He Wenjun asked Gu Chen, "what are you feeling? Is it because the dead knew you? "
Gu Chen shakes his head: "not really."
"And why are you?" When he Wenjun heard the speech, he felt that there was something in Gu Chen's words.
Gu Chen didn't answer immediately. Instead, he put the evidence collection bag on the parallel detection platform, and then turned to he Wenjun and said:
"you speculated that the dead Wang Jinshan died of drunken swimming. I don't think so, because according to the time of death, he Wenjun died in the early hours of last night."
"But you know, the last time I saw Wang Jinshan was dinner time."
"He was drunk at that time, but after we gave him milk, his condition began to improve gradually."
Looking around for a week, Gu Chen said again: "when he left, his consciousness began to wake up gradually."
"But in such a state, how could he possibly drown in the swimming pool in the early hours of the morning?"
"Unless there is one possibility, that is, he drinks again at home, so I would like to ask, have you found any traces of Wang Jinshan drinking in his home?"
"This..."
When Gu Chen suddenly asked, he Wenjun was stunned and shook his head: "it's not found. It's just that Wang Jinshan once drank alcohol last night, so we just make a general guess."
"That's uncertainty." Gu Chen affirmed.
Liu Zhiqiang frowned and turned to ask Gu Chen: "officer Gu, how do you know that the death time of the dead Wang Jinshan was around the early morning of last night? How can you conclude that it was the early morning of last night when the teacher has not reached a conclusion yet
"Don't judge." Before Liu Zhiqiang finished speaking, instructor Zhang Hui stood up straight and took a deep breath: "Gu Chen is right. The time of death is really around the early morning of last night."
"Really Really? " Liu Zhiqiang was a little unbelievable. He turned to Gu Chen and said, "but Gu Chen just came in a short time ago. He just observed the corpse. How could he tell the time so quickly? "
After looking at Zhang Hui, Liu Zhiqiang said: "even you, Mr. Zhang, have not completed the comprehensive test. This How could he... "
"I don't know, but he's right." Zhang Hui shook his head and laughed, turned to look at Gu Chen and asked, "Gu Chen, how do you know the time of death of the dead? I just finished testing the specific features. "
"And you just scraped the dirt from the fingernails of the dead Wang Jinshan, and you can determine the time of death?"
"Of course not." Gu Chen directly shook his head and explained, "in fact, to identify the cause of death of the deceased, I also judge according to previous experience."
"Experience?" He Wenjun was somewhat surprised. After all, autopsy work has always been done by the forensic team.
Gu Chen is not a forensic doctor, but he talks about experience here?
He Wenjun felt a little inconceivable.
Gu Chen pressed the corpse with his fingers to show them: "in fact, to judge the time of death, you can generally determine it in three directions. The first thing is to see the stiffness of the body."
"That's right." Instructor Zhang Hui agreed with Gu Chen's opinion and nodded slightly: "this is a way that our forensic doctors usually use to detect corpses."
After seeing Gu Chen, Zhang Hui asked again, "what is your standard of judgment?"
"It's simple." Gu Chen poked the corpse with one finger and said: "generally, the body will harden between 30 minutes and 2 hours after death, completely ossify from 9 hours to 12 hours, soften after 30 hours, and return to its original state after 70 hours."
Seeing Zhang Hui nodding slightly, Gu Chen said again: "but it is worth noting that if it is in the soil or water, or in the case of low-temperature drying, it will be delayed, and it will be accelerated under high-temperature and humid conditions."
"I also made my judgment based on these bases and some previous experience."
"Well." Zhang Hui was very satisfied with Gu Chen's answer.
Before I used these data to compare the corpse, infer that Wang Jinshan's death time may be in the early morning.
But Gu Chen can also judge with a very fast speed, which makes Zhang Hui look at Gu Chen differently.
He Wenjun and Zhang Zhiqiang also have a special eye on Gu Chen.
The two men and Gu Chen are colleagues, but for autopsy, most rely on the forensic team.However, being surpassed by the young colleague in front of us, we are somewhat embarrassed.
Liu Zhiqiang couldn't help joking: "it's quite reasonable. Besides this, what basis can you use to judge the time of death?"
"Too much." Gu Chen pulled up his finger to explain to the crowd: "and according to the body temperature to judge."
"Generally speaking, the body temperature drops by 1 degree per hour within 10 hours after death, and by 0.5 degrees per hour over 10 hours after death."
Hearing Gu Chen's remarks, he Wenjun and Liu Zhiqiang look at Zhang Hui together.
Zhang Hui also nodded in silence, agreed with Gu Chen's words. In his heart, he calculated the corpse according to the data provided by Gu Chen.
"So You just took the tool, in addition to extracting the dirt from the crevices of the corpse's nails, you also carried out temperature detection? "
"That's right." Gu Chen nodded slightly and admitted: "it was true that the temperature detection was carried out on the body just now, otherwise it would be difficult to judge the situation of the body."
"Is there another direction?" Zhang Hui realized at the moment that Gu Chen seemed far less simple than he imagined.
It seems that this guy is quite familiar with forensic work.
Gu Chen directly blurted out: "there is also according to the person died, in the body under the skin of the purple plaque, that is, to judge the corpse."
"Because the plaque usually appears at 2 to 4 hours after death, reaches its maximum height after 12 to 14 hours, and is fixed at 24 to 36 hours without metastasis."
"However, the occurrence and development of general corpse phenomenon are greatly affected by internal and external factors, so we should objectively analyze all the conditions."
"That's great." Zhang Hui chuckled and said: "Gu Chen, I didn't expect that you could judge the time of death of the dead by simply passing these conditions. It's very rare. It can be seen that you don't have to work hard at ordinary times."
"Of course." Seeing the instructor Zhang Hui began to praise Gu Chen, Lu Weiwei was pleased to look out and say: "instructor Zhang, I have long said that Mr. Gu knows more about this business, but you don't believe it."
"No, No Zhang Hui interrupted Lu Weiwei and said, "it's not that I don't believe it. It's just that Gu Chen is too young. According to the law, he is not very familiar with the autopsy business."
"In my opinion, at least, young forensic doctors have some problems in testing."
"Maybe there are some people of the same age who can accurately determine the cause of death like Gu Chen, but those who can make preliminary judgment as quickly as Gu Chen are very rare. At least I haven't met them yet."
"It's pretty good." Liu Zhiqiang had to admire him. Even Zhang Hui was full of praise for Gu Chen. It can be seen that Gu Chen's business is solid, which is indeed extraordinary.
Such a variety is rare in the police force.
He Wenjun also said with a smile, "Gu Chen, are you so familiar with these forensic work? No wonder you have to rush to Mr. Zhang to help. You were really despised just now. "
"I didn't mean to rush here to help." Without waiting for he Wenjun to finish speaking, Gu Chen directly interrupted: "it is mainly because the dead have contacted me, and I still know some of his conditions."
"Coming here may give you some ideas on how to handle cases, so That's what I came to the lab for. "
Hearing Gu Chen's words, he Wenjun and Liu Zhiqiang look at each other, and they can't help but thumbs up.
"It seems that you have come to the right place. Welcome to the case handling team. I hope you can help us as much as you can in the testing room."
He Wenjun had doubts about why Gu Chen appeared here?
But now he Wenjun has no opinion on Gu Chen.
Gu Chen also nodded slightly to express his thanks.
At this time, Zhang Hui with Gu Chen extracted nail dirt, ready to test in the detection platform.
"If Wang Jinshan drowns in his own swimming pool, the dirt will have some problems unless it is on him," Wang said
"It's not a problem, it's a big problem." Gu Chen pointed out directly for officer Wang: "the dirt in my opinion is more like some soil, sand and gravel and plant debris."
"You mean..."
Hearing Gu Chen's words, he Wenjun frowned slightly.
"That's right." Gu Chen did not shy away, and said bluntly: "when people are drowning, they will try their best to catch anything around them and try to survive."
"Therefore, drowning people often cling to soil, small stones and plants in their hands. They can also be found in their fingernails. These things can also be used to determine the exact location."
"If a body is found in a swimming pool, then if the forensic autopsy finds debris not found in the pool in the lungs or nails of the deceased, it is possible that the victim was drowned elsewhere and later abandoned in the pool, pretending to be an accidental drowning incident."
"Brother Gu means The swimming pool in Wang Jinshan's home may not be the first scene? ""Yes, that's what it means." Gu Chen nodded slightly, but also said faintly: "if we can compare the specific origin of the substances contained in the debris, such as pollen, feather seeds, etc., it may be that the dead person drowned there."
"You have a point." He Wenjun agreed with Gu Chen.
However, as a colleague, he Wenjun couldn't help saying more. By the way, he educated Liu Zhiqiang around him:
"in fact, during autopsy, can you tell where the drowning person drowned? For example, in the bathtub or in the river? "
"If you can, to what extent, you need to carefully examine the dead. Gu Chen just scraped the dirt from Wang Jinshan's fingers, which is a good method."
"Yes." Gu Chen nodded slightly. He also removed the contaminated gloves and threw them into the garbage can around him. Then he said again:
"when a person is drowned, he will inhale the water and the substances in the water into his mouth, nose, throat and lungs."
"And these include leaves, insects, seeds, pollen and other debris."
"If you drown in a river or other natural waters, it is possible that the animal and plant materials found in the lungs of the deceased may be specific to some area."
"It's like finding pine pollen or pine needles in the lungs, which means that the victim drowned in a place near the water where pine trees grow."
"It is also true to replace it with other trees and other plants."
After a pause, Gu Chen added: "insects also have specific distribution areas, so finding insects in the lungs can also indicate a specific place."
"All the tests are consistent with changes. It's right to follow this standard."
"But..." Hearing this, Liu Zhiqiang hesitated and asked Gu Chen, "but the water in the pool is usually quite clean, so can't we find other clues?"
"It's OK." Gu Chen seamless docking, direct way: "swimming pool water is usually quite clean, but most of the chlorine, but this can be tested."
"Natural waters are completely chlorine-free. As early as the 1960s, humans probably did this test, but it's not common."
Looking at Liu Zhiqiang's thoughtful look, Gu Chen said, "so the water in the bathtub should be clean and chlorine free, but it may contain some soap or grease, which can also be tested."
"So the substance in the inhaled water can often be used to help determine the position of drowning."
"I see. No wonder Mr. Zhang asked us to extract water samples from the swimming pool. That's why."
"Ha ha." Listening to Gu Chen's explanation to these two people, Zhang Hui, sitting on the testing platform, could not help laughing, but also reminded him: "you may have forgotten me, and forgotten what I am specialized in."
"How can it be?" He Wenjun glanced at Zhang Hui, but also took the initiative to show his kindness: "you are an expert in diatom detection, which line would you like to cooperate with?"
Zhang Hui on the detection platform smiles, is also joking and said: "this you do not rely on me is really not good."
"Since the German scientist revenstorf used a microscope to detect diatom from lung drowning fluid in 1904, forensic workers at home and abroad have conducted in-depth research on diatom detection methods."
"But in fact, you don't know that China began to test and study diatoms in the 1930s."
"Up to the 1960s, six provinces and autonomous regions in central and southern China had carried out joint research on how to improve the detection rate of diatoms. My father was one of the members of the diatom detection team."
"So it is?" Lu Weiwei was also surprised, not make complaints about it: "Zhang was a forensic family. All of them eat this bowl of rice. "
"Ha ha, it's OK. It's mainly influenced by my father." Zhang Xuehui doesn't care about it.
But it doesn't matter. Gu Chen couldn't help but directly answered: "yes, I've read the relevant documents, but I didn't expect that there was instructor Zhang's father in this early diatom detection team."
"It was a long time ago, not to mention it now." Instructor Zhang Hui after testing a sample, and then another sample out.
Gu Chen is a light said: "I remember in 1998, Canadian forensic pathologist, Michel Bergen, in his book" forensic diatom and drowning ", for the first time comprehensively discussed the scientific nature and forensic principles of diatom test."
"I also read that book a few months ago. In the book, the author proposed the concept of forensic diatom, including the principle, effectiveness and practicability of diatom test in the diagnosis of drowning, as well as the methods and procedures of diatom test."
"Because diatom has gradually been recognized as the most reliable marker for the diagnosis of drowning, diatom testing is also generally considered to be a more reliable means of diagnosis of drowning. Especially for the diagnosis of the cause of death of decaying corpses in water, it is regarded as the most effective method, which can be called the" gold standard. "
"This is a great improvement compared with the previous backward detection methods and rough experiments."After a pause, looking at Liu Zhiqiang and he Wenjun, Gu Chen said again: "when a person drowns, diatoms in the drowning fluid will break through the alveoli and enter the human body's blood for circulation, and along with the blood flow of the drowning death, it will be distributed to the brain and various internal organs."
"Therefore, today's diatom detection technology, mainly through the identification of the presence of diatoms in the body of the dead."
"If the analysis and identification results of diatom examination technology in visceral organs of the dead body are positive, and the species of diatoms are consistent with the water samples in the field, the death of the deceased can be determined as drowning."
"Now Wang Jinshan's body needs to be verified."
"However, there are many kinds of diatoms and their forms are different. The diatoms in each water source are not the same." Instructor Zhang Hui side head glanced at the eye Gu Chen, is also the scene test.
However, Gu Chen blurted out and said seamlessly: "yes, there are many kinds of diatoms, but diatoms are single celled organisms widely distributed in water. The cell wall is composed of a large amount of silica, which is extremely stable and hard."
"Therefore, the qualitative and quantitative analysis of diatoms in the main organs of corpses in water can not only directly determine the cause of death, but also point to the possible drowning sites."
"Bang!"
Gu Chen's voice just fell, instructor Zhang Hui's arm touched the tray where the utensils were stored, and it was banging for a while.
"Instructor Zhang, are you ok?" Gu Chen's eyes are attracted.
Zhang Hui waved his hand: "it's OK, just found some anomalies, so I accidentally touched the tray."
……
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Detection room. When Gu Chen finished extracting the dirt from Wang Jinshan's fingers, he Wenjun stepped forward and asked, "do you know what this is?" "It's hard to say yet." Gu Chen sealed the small transparent forensics bag and marked the number on the label paper. Then he said: "further detection is needed because these dirt are in powder form. At least I need to test before I know." Looking at Gu Chen's suspicious look on his face, Liu Zhiqiang on one side asked, "is the dirt in the nail gap left by Wang Jinshan when he scratched?" "Maybe." Gu Chen said very simply, but he sighed. This attracted the attention of he Wenjun. He Wenjun asked Gu Chen, "what are you feeling? Is it because the dead knew you? " Gu Chen shakes his head: "not really." "And why are you?" When he Wenjun heard the speech, he felt that there was something in Gu Chen's words. Gu Chen didn't answer immediately. Instead, he put the evidence collection bag on the parallel detection platform, and then turned to he Wenjun and said: "you speculated that the dead Wang Jinshan died of drunken swimming. I don't think so, because according to the time of death, he Wenjun died in the early hours of last night." "But you know, the last time I saw Wang Jinshan was dinner time." "He was drunk at that time, but after we gave him milk, his condition began to improve gradually." Looking around for a week, Gu Chen said again: "when he left, his consciousness began to wake up gradually." "But in such a state, how could he possibly drown in the swimming pool in the early hours of the morning?" "Unless there is one possibility, that is, he drinks again at home, so I would like to ask, have you found any traces of Wang Jinshan drinking in his home?" "This..." When Gu Chen suddenly asked, he Wenjun was stunned and shook his head: "it's not found. It's just that Wang Jinshan once drank alcohol last night, so we just make a general guess." "That's uncertainty." Gu Chen affirmed. Liu Zhiqiang frowned and turned to ask Gu Chen: "officer Gu, how do you know that the death time of the dead Wang Jinshan was around the early morning of last night? How can you conclude that it was the early morning of last night when the teacher has not reached a conclusion yet "Don't judge." Before Liu Zhiqiang finished speaking, instructor Zhang Hui stood up straight and took a deep breath: "Gu Chen is right. The time of death is really around the early morning of last night." "Really Really? " Liu Zhiqiang was a little unbelievable. He turned to Gu Chen and said, "but Gu Chen just came in a short time ago. He just observed the corpse. How could he tell the time so quickly? " After looking at Zhang Hui, Liu Zhiqiang said: "even you, Mr. Zhang, have not completed the comprehensive test. This How could he... " "I don't know, but he's right." Zhang Hui shook his head and laughed, turned to look at Gu Chen and asked, "Gu Chen, how do you know the time of death of the dead? I just finished testing the specific features. " "And you just scraped the dirt from the fingernails of the dead Wang Jinshan, and you can determine the time of death?" "Of course not." Gu Chen directly shook his head and explained, "in fact, to identify the cause of death of the deceased, I also judge according to previous experience." "Experience?" He Wenjun was somewhat surprised. After all, autopsy work has always been done by the forensic team. Gu Chen is not a forensic doctor, but he talks about experience here? He Wenjun felt a little inconceivable. Gu Chen pressed the corpse with his fingers to show them: "in fact, to judge the time of death, you can generally determine it in three directions. The first thing is to see the stiffness of the body." "That's right." Instructor Zhang Hui agreed with Gu Chen's opinion and nodded slightly: "this is a way that our forensic doctors usually use to detect corpses." After seeing Gu Chen, Zhang Hui asked again, "what is your standard of judgment?" "It's simple." Gu Chen poked the corpse with one finger and said: "generally, the body will harden between 30 minutes and 2 hours after death, completely ossify from 9 hours to 12 hours, soften after 30 hours, and return to its original state after 70 hours." Seeing Zhang Hui nodding slightly, Gu Chen said again: "but it is worth noting that if it is in the soil or water, or in the case of low-temperature drying, it will be delayed, and it will be accelerated under high-temperature and humid conditions." "I also made my judgment based on these bases and some previous experience." "Well." Zhang Hui was very satisfied with Gu Chen's answer. Before I used these data to compare the corpse, infer that Wang Jinshan's death time may be in the early morning. But Gu Chen can also judge with a very fast speed, which makes Zhang Hui look at Gu Chen differently. He Wenjun and Zhang Zhiqiang also have a special eye on Gu Chen. The two men and Gu Chen are colleagues, but for autopsy, most rely on the forensic team.However, being surpassed by the young colleague in front of us, we are somewhat embarrassed. Liu Zhiqiang couldn't help joking: "it's quite reasonable. Besides this, what basis can you use to judge the time of death?" "Too much." Gu Chen pulled up his finger to explain to the crowd: "and according to the body temperature to judge." "Generally speaking, the body temperature drops by 1 degree per hour within 10 hours after death, and by 0.5 degrees per hour over 10 hours after death." Hearing Gu Chen's remarks, he Wenjun and Liu Zhiqiang look at Zhang Hui together. Zhang Hui also nodded in silence, agreed with Gu Chen's words. In his heart, he calculated the corpse according to the data provided by Gu Chen. "So You just took the tool, in addition to extracting the dirt from the crevices of the corpse's nails, you also carried out temperature detection? " "That's right." Gu Chen nodded slightly and admitted: "it was true that the temperature detection was carried out on the body just now, otherwise it would be difficult to judge the situation of the body." "Is there another direction?" Zhang Hui realized at the moment that Gu Chen seemed far less simple than he imagined. It seems that this guy is quite familiar with forensic work. Gu Chen directly blurted out: "there is also according to the person died, in the body under the skin of the purple plaque, that is, to judge the corpse." "Because the plaque usually appears at 2 to 4 hours after death, reaches its maximum height after 12 to 14 hours, and is fixed at 24 to 36 hours without metastasis." "However, the occurrence and development of general corpse phenomenon are greatly affected by internal and external factors, so we should objectively analyze all the conditions." "That's great." Zhang Hui chuckled and said: "Gu Chen, I didn't expect that you could judge the time of death of the dead by simply passing these conditions. It's very rare. It can be seen that you don't have to work hard at ordinary times." "Of course." Seeing the instructor Zhang Hui began to praise Gu Chen, Lu Weiwei was pleased to look out and say: "instructor Zhang, I have long said that Mr. Gu knows more about this business, but you don't believe it." "No, No Zhang Hui interrupted Lu Weiwei and said, "it's not that I don't believe it. It's just that Gu Chen is too young. According to the law, he is not very familiar with the autopsy business." "In my opinion, at least, young forensic doctors have some problems in testing." "Maybe there are some people of the same age who can accurately determine the cause of death like Gu Chen, but those who can make preliminary judgment as quickly as Gu Chen are very rare. At least I haven't met them yet." "It's pretty good." Liu Zhiqiang had to admire him. Even Zhang Hui was full of praise for Gu Chen. It can be seen that Gu Chen's business is solid, which is indeed extraordinary. Such a variety is rare in the police force. He Wenjun also said with a smile, "Gu Chen, are you so familiar with these forensic work? No wonder you have to rush to Mr. Zhang to help. You were really despised just now. " "I didn't mean to rush here to help." Without waiting for he Wenjun to finish speaking, Gu Chen directly interrupted: "it is mainly because the dead have contacted me, and I still know some of his conditions." "Coming here may give you some ideas on how to handle cases, so That's what I came to the lab for. " Hearing Gu Chen's words, he Wenjun and Liu Zhiqiang look at each other, and they can't help but thumbs up. "It seems that you have come to the right place. Welcome to the case handling team. I hope you can help us as much as you can in the testing room." He Wenjun had doubts about why Gu Chen appeared here? But now he Wenjun has no opinion on Gu Chen. Gu Chen also nodded slightly to express his thanks. At this time, Zhang Hui with Gu Chen extracted nail dirt, ready to test in the detection platform. "If Wang Jinshan drowns in his own swimming pool, the dirt will have some problems unless it is on him," Wang said "It's not a problem, it's a big problem." Gu Chen pointed out directly for officer Wang: "the dirt in my opinion is more like some soil, sand and gravel and plant debris." "You mean..." Hearing Gu Chen's words, he Wenjun frowned slightly. "That's right." Gu Chen did not shy away, and said bluntly: "when people are drowning, they will try their best to catch anything around them and try to survive." "Therefore, drowning people often cling to soil, small stones and plants in their hands. They can also be found in their fingernails. These things can also be used to determine the exact location." "If a body is found in a swimming pool, then if the forensic autopsy finds debris not found in the pool in the lungs or nails of the deceased, it is possible that the victim was drowned elsewhere and later abandoned in the pool, pretending to be an accidental drowning incident." "Brother Gu means The swimming pool in Wang Jinshan's home may not be the first scene? ""Yes, that's what it means." Gu Chen nodded slightly, but also said faintly: "if we can compare the specific origin of the substances contained in the debris, such as pollen, feather seeds, etc., it may be that the dead person drowned there." "You have a point." He Wenjun agreed with Gu Chen. However, as a colleague, he Wenjun couldn't help saying more. By the way, he educated Liu Zhiqiang around him: "in fact, during autopsy, can you tell where the drowning person drowned? For example, in the bathtub or in the river? " "If you can, to what extent, you need to carefully examine the dead. Gu Chen just scraped the dirt from Wang Jinshan's fingers, which is a good method." "Yes." Gu Chen nodded slightly. He also removed the contaminated gloves and threw them into the garbage can around him. Then he said again: "when a person is drowned, he will inhale the water and the substances in the water into his mouth, nose, throat and lungs." "And these include leaves, insects, seeds, pollen and other debris." "If you drown in a river or other natural waters, it is possible that the animal and plant materials found in the lungs of the deceased may be specific to some area." "It's like finding pine pollen or pine needles in the lungs, which means that the victim drowned in a place near the water where pine trees grow." "It is also true to replace it with other trees and other plants." After a pause, Gu Chen added: "insects also have specific distribution areas, so finding insects in the lungs can also indicate a specific place." "All the tests are consistent with changes. It's right to follow this standard." "But..." Hearing this, Liu Zhiqiang hesitated and asked Gu Chen, "but the water in the pool is usually quite clean, so can't we find other clues?" "It's OK." Gu Chen seamless docking, direct way: "swimming pool water is usually quite clean, but most of the chlorine, but this can be tested." "Natural waters are completely chlorine-free. As early as the 1960s, humans probably did this test, but it's not common." Looking at Liu Zhiqiang's thoughtful look, Gu Chen said, "so the water in the bathtub should be clean and chlorine free, but it may contain some soap or grease, which can also be tested." "So the substance in the inhaled water can often be used to help determine the position of drowning." "I see. No wonder Mr. Zhang asked us to extract water samples from the swimming pool. That's why." "Ha ha." Listening to Gu Chen's explanation to these two people, Zhang Hui, sitting on the testing platform, could not help laughing, but also reminded him: "you may have forgotten me, and forgotten what I am specialized in." "How can it be?" He Wenjun glanced at Zhang Hui, but also took the initiative to show his kindness: "you are an expert in diatom detection, which line would you like to cooperate with?" Zhang Hui on the detection platform smiles, is also joking and said: "this you do not rely on me is really not good." "Since the German scientist revenstorf used a microscope to detect diatom from lung drowning fluid in 1904, forensic workers at home and abroad have conducted in-depth research on diatom detection methods." "But in fact, you don't know that China began to test and study diatoms in the 1930s." "Up to the 1960s, six provinces and autonomous regions in central and southern China had carried out joint research on how to improve the detection rate of diatoms. My father was one of the members of the diatom detection team." "So it is?" Lu Weiwei was also surprised, not make complaints about it: "Zhang was a forensic family. All of them eat this bowl of rice. " "Ha ha, it's OK. It's mainly influenced by my father." Zhang Xuehui doesn't care about it. But it doesn't matter. Gu Chen couldn't help but directly answered: "yes, I've read the relevant documents, but I didn't expect that there was instructor Zhang's father in this early diatom detection team." "It was a long time ago, not to mention it now." Instructor Zhang Hui after testing a sample, and then another sample out. Gu Chen is a light said: "I remember in 1998, Canadian forensic pathologist, Michel Bergen, in his book" forensic diatom and drowning ", for the first time comprehensively discussed the scientific nature and forensic principles of diatom test." "I also read that book a few months ago. In the book, the author proposed the concept of forensic diatom, including the principle, effectiveness and practicability of diatom test in the diagnosis of drowning, as well as the methods and procedures of diatom test." "Because diatom has gradually been recognized as the most reliable marker for the diagnosis of drowning, diatom testing is also generally considered to be a more reliable means of diagnosis of drowning. Especially for the diagnosis of the cause of death of decaying corpses in water, it is regarded as the most effective method, which can be called the" gold standard. " "This is a great improvement compared with the previous backward detection methods and rough experiments."After a pause, looking at Liu Zhiqiang and he Wenjun, Gu Chen said again: "when a person drowns, diatoms in the drowning fluid will break through the alveoli and enter the human body's blood for circulation, and along with the blood flow of the drowning death, it will be distributed to the brain and various internal organs." "Therefore, today's diatom detection technology, mainly through the identification of the presence of diatoms in the body of the dead." "If the analysis and identification results of diatom examination technology in visceral organs of the dead body are positive, and the species of diatoms are consistent with the water samples in the field, the death of the deceased can be determined as drowning." "Now Wang Jinshan's body needs to be verified." "However, there are many kinds of diatoms and their forms are different. The diatoms in each water source are not the same." Instructor Zhang Hui side head glanced at the eye Gu Chen, is also the scene test. However, Gu Chen blurted out and said seamlessly: "yes, there are many kinds of diatoms, but diatoms are single celled organisms widely distributed in water. The cell wall is composed of a large amount of silica, which is extremely stable and hard." "Therefore, the qualitative and quantitative analysis of diatoms in the main organs of corpses in water can not only directly determine the cause of death, but also point to the possible drowning sites." "Bang!" Gu Chen's voice just fell, instructor Zhang Hui's arm touched the tray where the utensils were stored, and it was banging for a while. "Instructor Zhang, are you ok?" Gu Chen's eyes are attracted. Zhang Hui waved his hand: "it's OK, just found some anomalies, so I accidentally touched the tray." www.mylovenovel.com , the fastest update of the webnovel!
