When Gu Chen finished extracting the dirt from Wang Jinshan's ten fingers, He Wenjun stepped forward and asked, "Do you know what this is?"
"It's hard to tell now." After Gu Chen sealed the small transparent evidence bag, he marked the number on the label, and then said: "Further testing is needed, because the dirt is in powder form, at least I still have it.
We need to test it before we know.”
Seeing Gu Chen's suspicious look, Liu Zhiqiang asked, "Could the dirt in the gaps between nails be left behind when Wang Jinshan scratched his itch?"
"Maybe." Gu Chen said simply, but he sighed deeply.
This caught He Wenjun's attention.
He Wenjun asked Gu Chen: "What are you lamenting about? Is it because the deceased knew you?"
Gu Chen shook his head: "No."
"Then why?" He Wenjun heard this and felt that there was something in Gu Chen's words.
Gu Chen did not answer immediately, but placed the evidence collection bag on the parallel testing table, then turned around and said to He Wenjun:
"You previously speculated that the deceased Wang Jinshan died of drunken swimming. I don't think so, because based on the time of death, He Wenjun died around early last night."
"But you have to know that the last time I saw Wang Jinshan was at dinner time."
"Although he was drunk at the time, his condition gradually improved after we gave him milk."
After looking around, Gu Chen added: "When he left, his consciousness had begun to gradually wake up."
"But in such a state, how could he get drunk and drown in the swimming pool around early in the morning?"
"Unless there is a possibility that he drank alcohol again at home, so I would like to ask, have you found any traces of Wang Jinshan drinking at his home?"
"this……"
When Gu Chen suddenly asked, He Wenjun was stunned, shook his head and said: "It's true that we haven't discovered this. It's just because we found that Wang Jinshan drank alcohol last night, so we can only make a rough guess."
"That means uncertainty." Gu Chen said with certainty.
Liu Zhiqiang on the side frowned and turned to ask Gu Chen: "Officer Gu, how do you know that the death time of the deceased Wang Jinshan was around the early morning of last night? The teacher hasn't made a conclusion yet on this picture, how can you conclude that it was early last night?
?”
"There is no need to conclude." Before Liu Zhiqiang could finish his words, instructor Zhang Hui stood up straight and took a deep breath and said: "Gu Chen is right, the time of death was indeed around midnight last night."
"Really...really?" Liu Zhiqiang was a little in disbelief. He turned to look at Gu Chen and said without knowing why: "But...Gu Chen just came in not long ago. He just made a simple observation of the corpse. How could he do it so quickly?"
Determine the time?"
Glancing at Zhang Hui, Liu Zhiqiang added: "Even your teacher, Zhang, hasn't completed the comprehensive test yet. This...how can he..."
"I don't know either, but what he said is right." Zhang Hui shook his head and smiled, then turned to look at Gu Chen and asked: "Gu Chen, how did you know the time of death of the deceased? I have just finished testing the specific characteristics."
"And you just scraped the dirt from the fingernails of the deceased King Jinshan, and you can determine the time of death?"
"Of course not." Gu Chen shook his head and explained, "Actually, when it comes to identifying the cause of death, I base my judgment on my previous experience."
"Experience?" He Wenjun was a little surprised. After all, autopsy work has always been completed by the forensic team.
Gu Chen is not a forensic examiner, but he talks about his experience here?
He Wenjun felt a little incredible.
Gu Chen, on the other hand, pressed the corpse with his fingers to show everyone: "In fact, to judge the time of death, it can generally be determined from three directions. The first is to look at the degree of rigor mortis of the corpse."
"That's right." Instructor Zhang Hui agreed with Gu Chen's opinion and nodded slightly: "This is a method that our forensic doctors usually use to detect corpses."
Looking at Gu Chen, Zhang Hui asked again: "Then what is your judgment standard?"
"It's very simple." Gu Chen poked the corpse with one finger and said: "Under normal circumstances, the corpse will harden between 30 minutes and 2 hours after death, it will be completely fossilized between 9 hours and 12 hours, and it will soften after 30 hours.
However, after 70 hours, it will return to its original state."
Seeing Zhang Hui nodded slightly, Gu Chen added: "But it is worth noting that if it is in soil or water, or under low-temperature and dry conditions, it will be delayed, and it will be accelerated under high-temperature and humid conditions."
"I also made my judgment based on these foundations and some previous experiences."
"Yeah." Zhang Hui was very satisfied with Gu Chen's answer.
I had also used this data to compare the corpses before, and concluded that Wang Jinshan's death time might have been around early morning.
But Gu Chen could also judge at an extremely fast speed, which made Zhang Hui look at Gu Chen in a new light.
Also looking at Gu Chen in a different light are He Wenjun and Liu Zhiqiang.
The two of them were traveling with Gu Chen, but most of them relied on the forensic team for autopsies.
But being surpassed by the young colleague in front of them, everyone felt a little embarrassed.
Liu Zhiqiang couldn't help but joked: "That makes sense, but besides this, what other basis can you use to judge the time of death?"
"Too many." Gu Chen raised his fingers and explained to everyone: "There is also a judgment based on the temperature of the corpse."
"Generally speaking, within 10 hours after death, the temperature of the corpse drops by 1 degree per hour, and more than 10 hours after death, the temperature of the corpse drops by 0.5 degrees per hour."
After hearing what Gu Chen said, He Wenjun and Liu Zhiqiang both looked at Zhang Hui.
Zhang Hui also nodded silently, agreeing with Gu Chen's words, and was still making calculations about the body based on the data provided by Gu Chen.
"So... you just took the tool and in addition to extracting the dirt from the gaps between the corpse's nails, you also conducted a temperature test?"
"That's right." Gu Chen nodded slightly and admitted: "We did conduct a temperature test on the corpse just now, otherwise it would be difficult to judge the condition of the corpse."
This chapter is not finished yet, please click on the next page to continue reading the exciting content! "What's another direction?" Zhang Hui realized at this moment that Gu Chen seemed to be far from as simple as he imagined.
It seems that this guy is also quite familiar with the forensic work business.
Gu Chen blurted out directly: "The other method is to judge based on the purple-red patches that appear on the skin under the body after death, which are corpse plaques."
"Because cadaver spots usually appear 2 hours to 4 hours after death, develop to their highest level after 12 hours to 14 hours, and become fixed and no longer transfer within 24 hours to 36 hours."
"However, the occurrence and development of the general corpse phenomenon are greatly affected by internal and external factors, so all conditions should be comprehensively analyzed objectively."
"That's very good." Zhang Hui curled his lips and smiled, and couldn't help but said: "Gu Chen, I didn't expect that you could comprehensively judge the time of death of the deceased just by simply passing these conditions. This is very rare. It shows that you have worked hard.
."
"Of course." Seeing instructor Zhang Hui start praising Gu Chen, Lu Weiwei was overjoyed and said: "Instructor Zhang, I have long said that my junior brother Gu knows more about this business, you still 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. Logically speaking, he must not be familiar with the autopsy business."
"At least in my opinion, young forensic doctors have some problems in testing."
"Perhaps there are some peers who can accurately judge the cause of death like Gu Chen, but it is very rare for people to make preliminary judgments as quickly and accurately as Gu Chen, at least for me.
Never met."
"It's quite impressive." Liu Zhiqiang had to admire him. Even Zhang Hui was full of praise for Gu Chen, which shows that Gu Chen's business is indeed extraordinary.
Such versatile individuals are rare in the police force.
He Wenjun also smiled and said: "Gu Chen, you are so familiar with these forensic work? No wonder you rushed to come to Teacher Zhang to help. I really underestimated you just now."
"Actually, I don't want to rush here to help." Before He Wenjun could finish his words, Gu Chen directly interjected: "Mainly because the deceased had contact with me, and I know some of his situation fairly well."
"Coming here, I may be able to provide you with some ideas for handling the case, so...this is the purpose of my coming to the testing room."
Hearing Gu Chen's words, He Wenjun and Liu Zhiqiang looked at each other and couldn't help but give a thumbs up.
"It seems that you have come to the right place. Welcome to join the case handling team. I hope you can provide us with the help you can in the testing room."
He Wenjun was still confused before, wondering why Gu Chen appeared here?
But now He Wenjun no longer has any objections to Gu Chen.
Gu Chen also nodded slightly to express his gratitude.
At this time, Zhang Hui took the nail dirt extracted by Gu Chen and prepared to inspect it on the testing platform.
Officer Wang said more: "If Wang Jinshan drowned in his swimming pool, then unless the dirt is on his body, there will be some problems."
"It's not that there is a problem, but there is a big problem." Gu Chen directly corrected Officer Wang: "To me, these dirt are more like soil, gravel and plant debris."
"you mean……"
Hearing Gu Chen's words, He Wenjun frowned slightly.
"That's right." Gu Chen didn't shy away from it and said directly: "When a person is drowning, he will try his best to grab anything around him to survive."
"So drowning people often hold on to soil, small stones, plants, etc. in their hands, and they can often 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, and if the forensic doctor finds debris in the deceased's lungs or fingernails that are not in the swimming pool during the autopsy, it is possible that the deceased drowned elsewhere and was later dumped in the swimming pool.
, pretending to be an accidental drowning incident.”
"Junior brother Gu means...the swimming pool at the deceased Wang Jinshan's home may not be the first scene?"
"Yes, that's what I mean." Gu Chen nodded slightly and said calmly: "If we can compare the specific origin of the substances contained in the debris, such as pollen, feather seeds, etc., it may be able to indicate that the deceased drowned there.
of."
"What you said makes sense." He Wenjun agreed with Gu Chen's opinion.
But as a colleague, He Wenjun couldn't help but say a few more words and educate Liu Zhiqiang around him:
"In fact, when performing an autopsy, can we identify where the drowned person drowned? For example, was it in a bathtub or in a river?"
"If possible, to what extent it can be clarified, the deceased needs to be carefully examined. Gu Chen just scraping the dirt from the gaps between the fingers of the deceased Wang Jinshan is a good method."
"Yes." Gu Chen nodded slightly, took off the contaminated gloves, threw them into the trash can next to him, and then said:
"When a person drowns, he or she inhales water and the substances contained in the water into the mouth, nose, throat and lungs."
"These materials include leaves, insects, seeds, pollen and other debris."
"If someone drowned in a river or other natural body of water, the plant and animal materials found in the deceased's lungs may be specific to that area."
"It's like finding pieces of pine pollen or pine needles in the lungs, which means the victim drowned near the water where pine trees grow."
"Even if it were replaced with other trees and other plants, it would still be true."
After a pause, Gu Chen added: "Insects also have specific distribution areas, so finding insects in the lungs can also hint at a specific place."
"All tests are consistent with their original purpose. Just follow this standard."
"But..." Hearing this, Liu Zhiqiang hesitated and asked Gu Chen: "But the water in the swimming pool is usually quite clean, so wouldn't there be no other clues?"
"It's okay." Gu Chen seamlessly connected and said directly: "The water in the swimming pool is usually quite clean, but most of it contains chlorine, but this can be tested."
This chapter is not finished yet, please click on the next page to continue reading the exciting content! "Natural waters do not contain chlorine at all. As early as the 1960s, humans were likely to have conducted this test, but it was not common.
."
Looking at Liu Zhiqiang's thoughtful look, Gu Chen added: "So for example, the water in the bathtub should be very clean and does not contain chlorine, but it may contain some soap or grease, and these can also be detected."
"So the substances contained in the inhaled water can often be used to help determine the location of drowning."
"I understand. No wonder Teacher Zhang asked us to take a swimming pool water sample. It turns out this is the reason."
"Haha." Listening to Gu Chen's explanation to the two people, Zhang Hui, who was sitting on the testing platform, couldn't help but smile and reminded him:
"You may have almost forgotten me and what I am specialized in."
"How can I?" He Wenjun glanced at Zhang Hui and took the initiative to express his kindness: "You are an expert in diatom detection. How can I do this without your cooperation?"
Zhang Hui on the testing table smiled and said jokingly: "You really can't do this without relying on me."
"Since the German scientist Revenstorf used a microscope to detect diatoms from lung fluid in 1904, forensic workers at home and abroad have conducted in-depth research on diatom detection methods."
"But actually you don't know that our country started conducting diatom inspection research in the 1930s."
"In the 1960s, six provinces and autonomous regions in central and southern my country conducted joint research on how to improve the detection rate of diatoms. My father was a member of the team studying diatom detection."
"So that's it?" Lu Weiwei also looked surprised, and couldn't help complaining: "So instructor Zhang comes from a family of forensic doctors? They all eat this bowl of rice."
"Haha, it's okay. It's mainly because of my father's influence." Zhang Hui didn't care about this and just wanted to show off his knowledge in front of everyone.
It didn't matter if he didn't say it. Gu Chen couldn't help it anymore and directly answered: "Yes, I have also read the relevant documents, but I didn't expect that there was instructor Zhang's father in the early diatom testing team."
"That was still a very distant era, so I won't mention it now." After testing one sample, instructor Zhang Hui took out another sample.
Gu Chen said calmly: "I remember that in 1998, Canadian forensic pathologist Michelle Berlangen published the first examination of diatoms in his book Forensic Diatomology and Drowning.
Scientific and forensic principles are comprehensively discussed.”
"I also read that book a few months ago. The author in the book proposed the concept of forensic diatomology. The content includes the principles, effectiveness, and practicality of diatom testing for diagnosing drowning, as well as diatom testing methods and procedures, etc.
."
After a pause, Gu Chen continued: "Because diatoms are gradually considered to be the most reliable markers for diagnosing drowning, diatom testing is also generally considered to be a more reliable diagnostic method for drowning, especially for the cause of death of corpses putrefied in the water.
Diagnosis is regarded as the most effective method and can be called the 'gold standard'."
"Compared with the previous backward detection methods and crude experiments, this is already a great improvement."
Looking at Liu Zhiqiang and He Wenjun, Gu Chen added: "When a person drowns, the diatoms in the drowning fluid will break through the alveoli and enter the human blood for circulation, and will be distributed to the body along with the blood flow of the drowned person.
In its brain and various internal organs."
"Therefore, today's diatom detection technology is mainly based on identifying whether diatoms are present in the body of the deceased."
"If the analysis and identification results of diatom testing technology in the internal organs of the deceased's body are positive, and the type of diatoms is consistent with the water samples on the ground, it can be determined that the deceased died of drowning."
"And now Wang Jinshan's body needs to be verified."
"But there are many types of diatoms with different shapes, and the composition of diatoms in each water source is different." Instructor Zhang Hui glanced sideways at Gu Chen, which was also an on-site test.
Gu Chen blurted out and said seamlessly: "Yes, there are many types of diatoms, but diatoms are single-celled organisms that are widely distributed in water. Their cell walls are composed of a large amount of silica and are extremely stable and hard.
."
"Therefore, by detecting the qualitative and quantitative analysis of diatoms in the major organs of corpses in the water, we can not only make a more direct judgment on the cause of death, but also point to the possible place of drowning."
"boom!"
As soon as Gu Chen finished speaking, instructor Zhang Hui's arm hit the tray where the equipment was stored, causing a banging sound for a moment.
"Instructor Zhang, are you okay?" Gu Chen's eyes were attracted.
Zhang Hui waved his hand: "It's okay, I just found something abnormal, so I accidentally touched the tray."
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