Chapter 108 Site Investigation
December 28, 10:28 am.
The weather is cold and the temperature is not high.
Qinghe Amusement Park construction site.
Police from the Qinghe Road Police Station have begun to set up a cordon at the scene.
The person who reported the incident was a security guard at the construction site, an old man in his sixties.
The second action team has arrived at the scene first and is questioning the person who reported the crime. Zhang Hui is in charge.
“It’s winter now, the construction has stopped, and I’m the only one watching on the construction site.”
The old man’s name is Zhang Fugui, and he doesn’t have the fear or uneasiness he imagined, nor is he any nervous at all. emotions.
“Aren’t you nervous when you see the corpse?”
"Why are you nervous? I have seen the charnel house in a funeral home before, but I have never seen any corpses."
Zhang Fugui smoked low-quality cigarettes, his eyes did not waver, he just narrated plainly.
Lu Chuan drove a professional on-site survey vehicle and followed Liu Guodong, Yang Sen, Lao Bai, Wang Changjiang, and Shen Yan at the end of the convoy.
The scene was well protected and no one had been there except Zhang Fugui who found the body.
Qin Yong is understanding the basic situation, but currently there is only some information provided by Zhang Fugui.
Qinghe Amusement Park is an amusement park under construction. There are few people around. Except for a surveillance camera at the gate, Zhang Fugui is the only one in the entire venue.
"Old Liu, you enter first."
Liu Guodong nodded and led Lu Chuan into the scene.
The place where the body was dumped was about 700 meters east of the main gate, at the edge of the wall near the woods.
Haizhou has already had several heavy snowfalls in December, and places without artificial snow removal have been covered with snow.
Putting on three layers of rubber gloves, Lu Chuan picked up the survey box and followed Liu Guodong into the scene.
Later, Yang Sen and Lao Bai went to the outside of the wall to conduct surveys.
Wang Changjiang and Shen Yan are also ready. Once Lu Chuan and the others finish surveying the footprints and taking photos, they will inspect the body.
"Master, look at this."
At the scene, a naked female corpse was shaped into a large font, lying flat on the snow.
There were obvious scratches on the skin, and bits of blood dripped on the white snow, which was particularly dazzling.
Lu Chuan pointed to the obvious scratches on the wall, indicating that the murderer should have pushed the body over from the other side of the wall.
The fence is about two meters high and is a temporary fence composed of iron sheets surrounded by a green covering net.
There were no footprints around the body. Ten meters away was the trail that Zhang Fugui patrolled every day.
“First take pictures, then collect the blood on the snow.”
Lu Chuan nodded and started to set up the camera.
Lu Chuan’s first choice was to take azimuth photography, mainly to record and fix the location of the scene in the surrounding environment and the conditions of the surrounding environment.
Specific to this scene, it is the specific location of the corpse in the entire visible scene.
Compared with detail photography, azimuth photography has a larger shooting range. Lu Chuan used a wide-angle lens and continuous shooting.
Elementary field survey photography skills, you can do these things with ease.
Next is overview photography, also called full-view photography. Compared with azimuth photography, overview photography takes the body as the center and captures the positional relationship between the body and the wall, and the positional relationship between the surrounding trees.
This time, Lu Chuan used opposite photography, multi-directional photography and rotation continuous photography.
Next, Lu Chuan’s macro photography focused on the blood stain residue on the snow.
For this step of shooting, Lu Chuan changed the lens of the camera again.
There are certain differences between macro photography and general photography. In most cases, using a fixed focal length lens will produce better results.
In the past, special cameras were used for macro photography, which required the installation of a "macro adapter".
For example, a leather cavity extender, a close-up collar or a half-length mirror. The scene was relatively simple. After discovering the body, Zhang Fugui did not step forward to check at all, but directly called the police.
So, the situation inside the walls is simple and clear.
Wang Changjiang and Shen Yan also approached the body to conduct a preliminary autopsy.
Wang Changjiang is responsible for inspection and Shen Yan is responsible for recording.
"There were obvious bleeding spots on the neck of the corpse, and there were strangling marks on both hands. It was initially determined that the cause of death was mechanical asphyxiation."
Lu Chuan followed and inspected Wang Changjiang's body surface. At that time, he was also making some records.
Lu Chuan, who has mastered the intermediate spot investigation skills, also has some understanding of some basic forensic knowledge.
For example, the neck strangulation marks that Wang Changjiang just mentioned, it is judged that the death was caused by mechanical asphyxiation, but in fact, he was strangled to death.
Human life is very fragile. If you want to kill someone, as long as you master the correct skills, you can kill them with one finger.
Human life is also tenacious. If you don’t know the methods and techniques, you may not be able to kill someone even if you stab him dozens of times.
Strangulation is the most common method of death.
However, it is not easy to successfully complete the strangulation.
Causing death through strangulation actually controls the blood circulation in the cervical arteries, causing cerebral ischemia and causing death.
In order to hinder the return of blood in the neck of an adult, at least two kilograms of force must be exerted on the neck.
When this value reaches more than 3.5 kilograms, the common carotid artery will be completely blocked.
However, this force only blocks the superficial arteries in the neck and is not enough to cause death.
In the human neck, in addition to the common carotid artery supplying blood to the brain, there is also the vertebral artery which also supplies blood to the brain.
Only by completely blocking the common carotid artery and vertebral artery can the brain be completely deprived of oxygen.
The pressure that can cause vertebral artery occlusion in adults is 16.6 kilograms.
And it must last for more than five minutes to cause brain death.
This is why, after a person is strangled, clear marks will be left on the neck.
A force of at least 16.6 kilograms, lasting for more than five minutes, will definitely cause local bleeding on the skin and form strangulation marks.
Of course, strangulation can be judged not only by the marks on the skin of the neck, but also by the hyoid bone.
The victim who was strangled struggled to resist and desperately wanted to breathe. During the struggle, the hyoid bone would break.
Therefore, in the analysis of the skeleton, the fracture of the hyoid bone can basically determine that the deceased died of strangulation during his lifetime.
However, nothing is absolute, and the fracture of the hyoid bone must be judged accurately by looking at the specific fracture marks.
Wang Changjiang continued to observe and judge: "The time of death..."
Under current investigation, the time of death of the deceased is generally judged by the degree of rigor mortis and the temperature of the body.
After a person dies, the production of heat in the body stops immediately and begins to produce corpse cold.
The so-called corpse coldness means that in most cases, the temperature of the corpse will be higher than the ambient temperature.
Based on the principle of heat diffusion, the heat of the corpse will continue to spread to the surrounding environment until the two temperatures reach the same temperature.
As for the reduction of corpse temperature, it is different in different seasons, different regions, and different clothing conditions.
For example, in spring and autumn, the temperature of adult corpses in indoor air probably drops by less than one degree Celsius per hour.
But in water, body temperatures can drop by three to five degrees Celsius per hour.
But if it is outdoors in a hot summer environment, the temperature of the human body may still rise in a short period of time after death.
Experts have done special research on the temperature of corpses. Among the intermediate field survey skills that Lu Chuan obtained, there are only some applications of skills, but there is no corresponding process.
“The corpse has been frozen, and the temperature and degree of rigor mortis are of relatively small reference value, but judging from the color of the skin, the deceased is most likely dead for no more than a week.”
(End of Chapter)