December 28th, 10:28 AM.

The weather is cold, and the temperature is not high.

Qinghe Amusement Park construction site.

The police from Qinghe Road Police Station have already started setting up a cordon at the scene.

The report was made by the site security guard, an elderly man in his sixties.

Action Team Two has arrived at the scene ahead and is questioning the reporter, with Zhang Hui taking charge.

"It's winter now, the construction has stopped, and I'm the only one watching over the site."

The old man is named Zhang Fugui. He shows no fear, anxiety, or any nervousness as one might imagine.

"Aren't you nervous seeing the body?"

"Nervous about what? I used to see the morgue at the funeral home. I've seen all kinds of bodies."

Zhang Fugui puffed on a low-quality cigarette, his eyes showing no fluctuation, just narrating calmly.

Lu Chuan drove the crime scene investigation vehicle, carrying Liu Guodong, Yang Sen, Old Bai, Wang Changjiang, Shen Yan, and a few others, following at the end of the convoy.

The scene was well-preserved. Apart from Zhang Fugui who discovered the body, no one else had been there.

Qin Yong is currently gathering basic information, but at the moment, only some information provided by Zhang Fugui is available.

Qinghe Amusement Park is a construction site, secluded from the public, with only one surveillance camera at the main gate, and only Zhang Fugui is present at the site.

"Old Liu, you guys go in first."

Liu Guodong nodded and entered the site with Lu Chuan.

The dumping site is approximately seven hundred meters to the east of the main gate, near the edge of a wall by the woods.

Haizhou in December has seen several heavy snowfalls, and snow-covered areas without manual clearance are now buried under snow.

Putting on three layers of rubber gloves, Lu Chuan hoisted the crime scene kit and followed Liu Guodong into the scene.

Behind them, Yang Sen and Old Bai went to survey the outer perimeter of the wall.

Wang Changjiang and Shen Yan are also prepared, waiting for Lu Chuan and the team to finish examining the footprints and taking photographs before conducting the body examination.

"Master, look at this."

At the scene, a naked female corpse lay in a spread-eagle position, flat on the snow.

The skin had visible abrasions, with small spots of blood sharply contrasting against the white snow.

Lu Chuan pointed to the obvious scuff marks on the wall, indicating that the body was likely pushed over from the other side by the perpetrator.

The wall was about two meters high, made of a temporary barrier of iron panels covered by a green covering net.

There were no footprints around the body, and ten meters away was a narrow path created by Zhang Fugui's daily patrols.

"Take photographs first, then collect the blood on the snow."

Lu Chuan nodded and began setting up the camera.

Lu Chuan first took positional photographs, mainly to record and establish the location of the scene within the surrounding environment and its context.

Specifically for this site, it was to pinpoint the exact location of the body within the visible scene.

Compared to close-up photography, positional photography covers a larger area. Lu Chuan used a wide-angle lens with continuous shooting.

With his basic crime scene photography skills, he executed these tasks effortlessly.

Next was the overview photography, also known as full-view photography. Compared to positional photography, the overview centers on the body, capturing the spatial relationship between the body, the wall, and surrounding trees.

This time, Lu Chuan adopted opposing angles shooting, multi-directional shooting, and rotational continuous shooting.

Next, Lu Chuan conducted macro photography, primarily focusing on the bloodstains on the snow.

Before this step, Lu Chuan changed the camera lens.

Macro photography differs from general photography; in most cases, using a fixed focal length lens gives better results.

In the past, macro photography required a specialized camera with "close-up adapters" attached.

Such as bellows extenders, close-up rings, or half-mirrors.

The scene was relatively straightforward. After discovering the body, Zhang Fugui hadn't even approached to check but had directly called the police.

Thus, the situation inside the wall was simple and clear.

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

Wang Changjiang was in charge of the examination, and Shen Yan was responsible for the recording.

"The neck of the body shows obvious petechiae, both hands show signs of manual strangulation. Preliminary judgment indicates the cause of death is mechanical asphyxiation."

Lu Chuan was beside them, making some notes as Wang Changjiang examined the body surface.

Having mastered intermediate crime scene investigation skills, Lu Chuan had some understanding of basic forensic knowledge.

For example, the petechiae on the neck that Wang Changjiang mentioned, assessing for mechanical asphyxiation death, basically implies being throttled to death.

Human life is fragile. To kill someone, mastering the correct technique could mean even a single finger could do the job.

But human life is also resilient; without knowing the method and techniques, even stabbing dozens of times might not be fatal.

Throttling is one of the most common causes of death.

However, successfully executing throttling is not easily accomplished.

Killing by neck compression essentially involves cutting off blood flow to the brain by controlling the neck arteries, causing death by ischemia.

To impede the blood return from an adult's neck, at least two kilograms of force must be applied to the neck.

And when this value exceeds three and a half kilograms, the common carotid artery will be completely occluded.

However, this force only occludes the surface arteries of the neck and is not enough to be fatal.

Besides the common carotid artery supplying blood to the brain, the vertebral artery is also a source of cerebral blood supply.

Only by occluding both the common carotid arteries and the vertebral arteries can total brain oxygen deprivation be achieved.

The pressure required to occlude an adult vertebral artery is sixteen point six kilograms.

Moreover, this must be maintained for more than five minutes to result in brain death.

This is why, when a person is strangled, there are clear marks left on the neck.

Sustaining at least sixteen point six kilograms of force for over five minutes will undoubtedly cause localized bleeding under the skin, forming marks.

Of course, throttling can also be determined not just by neck skin marks, but also by examining the hyoid bone.

Victims strangled during the struggle to breathe will typically have a fractured hyoid bone due to desperate resistance.

Thus, in skeletal identification analysis, a fractured hyoid bone generally indicates the victim died from strangulation.

However, nothing is absolute, and the specific fracture marks of the hyoid must be examined to make an accurate judgment.

Wang Changjiang continued his observation and judgment: "The time of death..."

In crime scene investigation, the time of death is generally determined by the degree of rigor mortis and body temperature.

After death, the generation of heat within the body stops immediately, leading to a drop in body temperature.

So-called cadaveric cooling refers to most cases where the body temperature is higher than the ambient temperature.

Based on the principle of heat diffusion, a body's heat will continue to spread to the surrounding environment until the temperatures equalize.

The rate at which body temperature decreases varies depending on the season, region, and clothing conditions.

For instance, in spring and autumn, the body of an adult may decrease less than one degree Celsius per hour in indoor air.

However, in water, the body temperature may decrease by three to five degrees Celsius per hour.

Conversely, in high outdoor temperatures of summer, a human body might see a temporary rise in post-mortem temperature.

The study of body temperature has been specially researched by experts; Lu Chuan's intermediate scene investigation skills included some applications but no corresponding process details.

"The body is already frozen stiff; the temperature and degree of rigor have limited reference value, but judging by skin color, the likelihood is the death did not occur more than a week ago."

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