After Lu Chuan and others completed the investigation, Wang Changjiang and Shen Yan began to further examine the body.
Different from the focus of current investigations, forensic doctors mainly determine the time and cause of death of the deceased through autopsy examination.
"Based on the degree of swelling on the body's skin, it appears that the deceased had been immersed in water for more than 24 hours."
Depending on how long the corpse has been soaked in water, the degree of skin swelling will vary.
Wang Changjiang is a veteran in this field. He has dissected many corpses with blisters in the past and is very experienced in judging the degree of swollen skin on corpses.
Shen Yan listened carefully and took notes carefully.
Unlike Lu Chuan's cheating, Shen Yan's learning was step-by-step, and she learned a lot from Wang Changjiang in the past two years.
"The degree of soaking of the corpse mainly depends on the eyes and fingers."
Wang Changjiang also deliberately taught Shen Yan: "The eyes are the most vulnerable part to water. After the eyeballs are soaked in water, their color will become turbid and slightly bulging."
"The skin of your fingers will become wrinkled if soaked in water for more than ten minutes."
"Compared with the degree of swelling in other parts of the skin, you can determine the approximate duration of the blisters."
"Hmm," Shen Yan is obviously a good student who likes to learn. She records useful knowledge and asks questions from time to time: "Master, there are bite marks on the left ear of the corpse. You said last time that if the corpse has wounds, you can check the wounds after being soaked. How to judge the time of blistering based on the erosion condition?"
Wang Changjiang twisted the head of the corpse: "Look here, the blood seepage point has disappeared, and burrs have begun to appear on the edges. This is the characteristic of blisters that have been soaked for more than 20 hours."
"But the wound has not rotted, which means the blisters have been in the area for less than forty-eight hours."
Whether it is forensic medicine or field investigation, it is all an empirical science.
Theory is important, but experience is even more important.
With the same judgment criteria, the changes in the corpse will be different under different temperatures, different humidity, or different conditions indoors and outdoors.
At this time, only through experience can we make accurate judgments.
"The cause of death... The pinch marks on the neck were obvious, the lips were purple, and the face was blue and purple. There were no other injuries. The cause of death was initially determined to be mechanical asphyxiation."
The reason why Wang Changjiang was initially determined was because the final determination of the cause of death required an autopsy to give a final conclusion.
However, parents' opinions must be sought as to whether the corpse should be dissected and dissected.
In the cases that Wang Changjiang has encountered over the years, most of the family members will agree to the autopsy in adult death cases.
Some families of female corpses will disagree.
In cases of minor death, the vast majority of parents will not consent to an autopsy.
Of course, this presupposes that the medical examiner can issue an opinion on the time and cause of death without performing an autopsy.
Family members must also sign and agree.
For example, the deceased had taken certain drugs fed by the murderer before his death, such as sedatives. This cannot be found without an autopsy.
After taking sedatives and strangulation, the cause of death was still asphyxiation.
However, the sedation aspect was not performed because the family members did not agree with the autopsy, and an important clue was lost.
This may be the key to solving the case.
Therefore, both parties must sign to confirm.
"Based on rigor mortis... the time of death is about forty-eight hours."
The child disappeared after going to school two days ago, less than fifty hours after the body was found.
In other words, according to Wang Changjiang's judgment, the child was killed within an hour or two of leaving home.
But the soaking time should not exceed twenty-four hours.
In other words, after the murderer killed the child, it took nearly a day and a night before dumping the body.
So the specific time for dumping the body should be between last night and early this morning.
This judgment also supports the judgment of the current investigation side. The area near the motor shaft is indeed not the first crime scene.
After the results of the physical examination and autopsy were reported to Qin Yong,
With all kinds of information gathered, it is easy to make the above judgment based on Qin Yong's experience.
"Old Liu, I have to work hard for you."
Open the mobile phone navigation and zoom in on the nearby map.
"This is the children's home. Normally, children go to school from here. They walk about two kilometers along this road to reach Natural Village."
"But the child was not photographed by the surveillance cameras in Natural Village."
After the child was reported missing, the police from the Western Suburbs Police Station tore through the surveillance camera to make sure that no trace of the child was found.
"In other words, the places where the children disappeared are concentrated on a stretch of one or two kilometers."
"After the murder, the murderer hid the body and then dumped it between last night and early this morning."
"Check this section of the road and see if we can do a detailed survey. Maybe we can find clues."
Qin Yong also had the attitude of giving it a try.
Based on the current clues, it can be determined that the murderer took action on this two-kilometer stretch of road.
But it’s not certain whether they killed people on this stretch of road.
It is very likely that the murderer first kidnapped someone, then went to another place to kill someone, then hid the body, and then dumped the body in the dark at night or early in the morning.
"This stretch of road, even if it is not the first scene, must be the first place where the murderer kidnapped the child, and..."
Qin Yong zoomed out on the map, revealing a deliberately marked red dot.
"This is the location of the motor shaft where the body was found. It is about three kilometers away from the section of road where the child disappeared."
"The murderer will definitely hide the body after killing someone, Sun Jun!"
"arrive!"
"With the machine well as the center and a radius of five kilometers, we will investigate all the farmers living nearby!"
"yes!"
"Ren Qiang, your team is responsible for investigating the situation of the children's parents. Do they have any enemies or people with whom they have conflicts? I want to find out all the backgrounds of their families!"
"yes!"
Three groups of troops, at full capacity, advanced on three fronts.
Grape picking garden in spring.
Most of the grapes Wang Zihan's parents grew were grapes for winemaking.
But in recent years, in order to increase income, some edible grapes are also planted near the road. During the harvest in autumn, people from the city will come to pick it.
It's spring now, the ice and snow have just melted, and the grapes are still buried in the soil to keep warm. There are only endless rows of cement piles on both sides of the road, like lonely wild ghosts, standing motionless in the fields.
Starting from the vineyard where Wang Zihan lived, Lu Chuan, Liu Guodong and Lao Bai headed west.
"Brother Bai, use this. The searchlight can detect biological tissues that we cannot see with the naked eye."
This time, Lu Chuan and others can be said to be fully armed to the teeth.
Liu Guodong held a targeted biological trace detection device, and Lu Chuan held an ultra-wide spectrum on-site trace evidence search camera.
What Lao Bai was holding was the laser evidence detector that Lu Chuan had just learned to use.
Looking at the spots that lit up from time to time on the screen, Lao Bai quickly collected the physical evidence that he had searched.
"This thing works really well."
Grinning, Lao Bai sighed with emotion: "If we had this thing before, there would still be so many backlogged cases."
"It's just...there are too many things discovered..."
