December 28, 10:28 a.m.

The weather is cold and the temperature is not high.

Qinghe amusement park construction site.

The police of the Qinghe Road Police Station have already begun to set up a cordon at the scene.

The person who reported the case was a security officer at the construction site, an old man in his sixties.

The second action team has already arrived at the scene one step ahead and is questioning the informant, and Zhang Hui is specifically responsible.

"It's winter, the construction has stopped, and I'm alone on the construction site."

The old man's name is Zhang Fugui, and he has no imaginary fear and uneasiness, nor is he nervous.

"Aren't you nervous when you see a corpse?"

"What's so nervous, I've seen the morgue in the funeral home before, but I haven't seen any corpses."

Zhang Fugui smoked a low-quality cigarette, and his eyes did not fluctuate, just a bland narrative.

Lu Chuan drove a professional car for the survey, carrying Liu Guodong, Yang Sen, Lao Bai, Wang Changjiang and Shen Yan at the end of the team.

The scene was well protected, and no one had ever been here except for Zhang Fugui, who found the body.

Qin Yong is learning the basic situation, but at present, there is only some information provided by Zhang Fugui.

Qinghe Amusement Park is a playground under construction, and the surrounding area is inaccessible, except for a surveillance camera at the gate, there is only Zhang Fugui in the whole venue.

"Lao 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, on the edge of a fence near the woods.

In Haizhou in December, there have been several heavy snowfalls, and the places where there is no artificial snow clearing have been covered with snow.

Wearing three layers of rubber gloves, Lu Chuan carried the survey box and followed Liu Guodong into the scene.

Later, Yang Sen and Lao Bai went to the perimeter of the wall to investigate.

Wang Changjiang and Shen Yan are also ready, and when Lu Chuan and the others finish surveying their footprints, they will examine the body after the photo is over.

"Master, look at this."

At the scene, a naked female corpse was lying flat on the snow in a large shape.

There are obvious abrasion marks on the skin, and blood drips on the white snow are particularly dazzling.

Lu Chuan pointed to the obvious scratches on the wall, indicating that the body should have been pushed by the murderer from the other end of the wall.

The fence is about two meters high, and is a temporary fence made up of iron sheets and a green covering net.

There were no footprints around the corpse, and ten meters away was the sheep intestine path that Zhang Fugui patrolled every day.

"Take a picture first, then collect the blood from the snow."

Lu Chuan nodded and began to prop up the camera.

Lu Chuan's first choice is to take azimuth photography, mainly to record and fix the location of the scene in the surrounding environment and the condition of the surrounding environment.

Specific to this scene, it is the specific location of the body in the entire visual scene.

Compared with detailed photography, azimuth photography has a large shooting range, and Lu Chuan uses a wide-angle lens and continuous shooting method.

Elementary on-site survey and photography skills, do these with ease.

The next step is an overview photo, also known as a panorama photo, which focuses on the corpse and captures the location of the corpse and the surrounding trees.

This time, Lu Chuan used opposite photography, multi-directional photography, and continuous rotation photography.

Next, Lu Chuan took a macro shot, mainly the blood residue on the snow.

For this step of shooting, Lu Chuan changed the lens of the camera again.

There is a difference between macro shooting and normal shooting, and in most cases, it is better to shoot with a lens with a fixed focal length.

In the past, macro shooting was done with a special camera that required the addition of a "close-up attacher".

For example, cavity extenders, close-up adapters or bust lenses.

The scene was relatively simple, Zhang Fugui didn't come forward to check at all after finding the body, and called the police directly.

So, the situation inside the walls is simple and clear.

Wang Changjiang and Shen Yan also approached the body for a preliminary autopsy.

Wang Changjiang was in charge of the inspection, and Shen Yan was in charge of the records.

"There were obvious bleeding spots on the neck of the corpse, and the hands were clenched, and it was preliminarily judged that the cause of death of the deceased was mechanical asphyxiation."

Lu Chuan followed, and while Wang Changjiang was examining the corpse table, he was also making some records.

Lu Chuan, who has mastered intermediate field investigation skills, also has some understanding of some basic forensic science knowledge.

For example, the neck strangulation that Wang Changjiang just said, judging that he died of mechanical suffocation, was actually strangled to death.

Human life is fragile, and if you want to kill a person, as long as you master the right technique, you can shoot a person to death with one finger.

Human life is also tenacious, and if you don't know how to do it and how to do it, you may not be able to kill people even if you stab it dozens of times.

Strangulation is one of the most common forms of lethality.

However, it is not easy to successfully complete the strangulation.

Death by strangulation is actually caused by controlling blood flow in the arteries of the neck, resulting in ischemia of the brain.

To obstruct blood return in an adult's neck, apply at least two kilograms of force to the neck.

When this value reaches more than 3.5 kilograms, the common carotid artery will be completely closed.

However, this force is not enough to close the superficial arteries in the neck, and it 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 that also supplies blood to the brain.

Only by occlusion of the common carotid artery and vertebral artery can the brain be completely deprived of oxygen.

The pressure that can cause atresia of the vertebral artery in adults is 16.6 kilograms.

And it must be maintained for more than five minutes before it causes brain death.

This is the reason why after a person is strangled, the neck will leave clear marks.

A force of at least 16.6 kilograms, which lasts for more than five minutes, will definitely cause local bleeding of the skin, forming a strangulation.

Of course, strangulation can be judged not only by the traces of the skin on the neck, but also by the hyoid bone.

The strangled victim, desperate to breathe, resists so hard that the hyoid bone breaks during the struggle.

Therefore, in the identification and analysis of bones, the fracture of the hyoid bone can basically determine that the deceased died of strangulation before his death.

However, there are no absolutes in everything, and the fracture of the hyoid bone can only be accurately judged by looking at the specific fracture marks.

Wang Changjiang continued to observe and judge: "The time of death ......"

In the current investigation, the time of death of the deceased is generally judged by the degree of morture and the temperature of the corpse.

After death, the production of heat in the body immediately stops, and corpse coldness begins.

The so-called corpse cold 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 diffuse into the surrounding environment until the temperature of the two is agreed.

The decrease in the temperature of the corpse is different in different seasons, in different regions, and under different clothing conditions.

For example, in spring and autumn, adult corpses are in indoor air with a drop of less than one degree Celsius per hour.

But in the water, the temperature of the corpse can drop by three to five degrees Celsius per hour.

However, if it is outdoors in the summer heat, the temperature of the human body may rise in a short period of time after death.

Regarding the temperature of the corpse, there are experts who have done special research, and among the intermediate field survey skills obtained by Lu Chuan, only some skills are applied, but there is no corresponding process.

"The corpse has been frozen, and the reference value of temperature and degree of zombie morteur is relatively small, but judging from the color of the skin, the deceased is likely to die for no more than a week."

Some people died, but not completely......