Qin Hui, Wu Qiming, Wang Ruiqing and other people from the QZ City Criminal Investigation Detachment did not sleep all night.

On the edge of the ruins of the ruined Minghe Bridge, Li Donglin supervised the battle here for a night.

There are leaders of the provincial department to supervise the battle, and all resources are sent to the scene as soon as possible.

The emergency lighting vehicle illuminates the entire scene as if it were daylight.

More than 30 firefighters took turns to work with small hand-held blasting hammers to knock on the cement of the bridge piers little by little, and after nearly 20 hours, all the bones were finally cleared out when it was bright the next day.

However, there was no excitement at all about getting the job done, but everyone's heart sank to the bottom.

In the first pier, four skeletons were excavated.

In the second pier, three skeletons were excavated.

A bridge of more than 100 meters, thirteen piers, and seven skeletons were excavated!

The weather is still cold in early spring, and the cool blows into everyone's hearts.

"Lock off the scene, and the bones will be returned to the detachment."

QZ City Criminal Investigation Detachment, Forensic Laboratory.

Lu Chuan and the others slept for a while last night, and now they are in a good state of mind.

However, in the face of the seven skeletons, his face was also not good-looking.

Let's not talk about who these people are and how they died, let's talk about seven people!

There was no news at all!

How can it be?

The bones were excavated in their entirety, and the most important thing was to confirm the identity of the bones.

The first is the determination of the cause of death of the deceased.

"Skeleton No. 1, the fourth rib of the left rib was scratched with a sharp object, and the cause of death was preliminarily judged to be a sharp weapon piercing the heart......

"No cement residue was found in the brain cavity of Skull 1, it was poured into the cement pier after death."

"Bone No. 2, comminuted fracture of the right leg bone, dislocation fracture of the left arm, fracture of the third and fourth ribs of the left rib, and bone crack marks on the seventh rib of the right rib."

"Hyoid bone fracture, suffocation death......

"Skull fracture of skull No. 3, fractured neck, fractured sixth rib of the left rib, and dislocation of the tibia of the left leg."

"Percussion bone laceration on the right arm of Skeleton No. 4......

The students who can follow Zhang Yuanchao are said to be students, but the actual level of forensic medicine is higher than that of many grassroots units.

There is theoretical knowledge in the more complex bone identification analysis, but the practical experience is lacking.

But when it comes to doing a general skeletal injury evaluation, these people don't have any problems.

Every skeleton has injuries, and most of these injuries can directly determine the cause of death.

For example, if the hyoid bone is broken, under normal circumstances, the hyoid bone will form a separate individual after the corpse is ossified.

If it is not damaged by external forces, there is a high probability that it will not break.

Therefore, in general, as long as a broken hyoid bone is found in the bones, it can basically be judged as a death of asphyxiation.

The other corpses also basically had obvious bone scars.

The seven corpses, judging from the injuries of the bones, can clearly judge that they all experienced different degrees of abuse and injury before their deaths.

This basically excludes the possibility of accidental death and hiding the body.

In addition, three of the seven were poured into the piers while they were still alive.

The other four were watered on the piers after losing their vital signs.

Forensic medicine and on-site investigation are now the most important task to determine the identity of the victim through technical means.

The cause of death has basically been confirmed, the DNA extraction of the bones was done by Zhang Yuanchao's students, and Lu Chuan was responsible for determining the specific time of death of the seven people.

The time of ossification of corpses varies greatly in different external environments.

In a natural environment with high temperature and humidity, without external factors such as beast bites, it will become ossified in half a month at the earliest.

For example, in the tropical rainforest, after the death of the human body, a day later, before the zombie is completely gone, it has already begun to decompose

Fail.

After three days, the phenomenon of the Giant View in its full form will be formed.

After a week, the muscles decay and dissolve, leaving only the skin on the surface of the corpse.

In 10 to 15 days, the parasitic flies inside the corpse will digest the corpse completely, leaving only the gray and black bones.

In the process of weathering, the gray-black bones will gradually turn snow-white.

In general, the whiter the color of a human bone, the longer it will take to die.

However, color alone cannot accurately know the time of white ossification.

Lu Chuan still has to do some experiments.

The concrete used to construct the piers is not the same as the general concrete.

There are many kinds of grades of concrete, and the application occasions are different according to the nature of the project.

Cement grade is the strength index of cement, which measures the solidity of cement after mixing and hardening.

There are many factors that affect the strength of cement, such as the mineral composition in cement, the thickness of the particles, the temperature and humidity during hardening, and so on.

The cement of the piers of the Minghe Bridge is made of low-temperature Portland cement, which has better water resistance than ordinary Portland cement.

The body was sealed in the process of cement canning.

After fifteen years, the corpses inside have completed the ossification, but the specific time of death is still difficult to determine, especially the four corpses that died when they were sealed.

The experiment was very simple, Lu Chuan wrapped a chicken leg in cotton cloth and used the same cement as that year to encapsulate it.

Then by adding some chemicals, it simulates the change over fifteen years.

This is completely based on experience, what substances are added, how much is added, in order to simulate the time change of fifteen years, there is a saying.

When the current investigation was busy, the front-line criminal police of the QZ City Criminal Investigation Detachment were not idle.

The winning bidder for the construction of the Minghe Bridge was QZ No. 1 Bridge Construction Group Co., Ltd., and the engineering construction unit was its subordinate highway and bridge construction branch.

The Minghe Bridge was a key project in QZ City that year, and the relevant engineering information was very complete.

Fifteen years, although the time is not short, but it is not so much that things are wrong.

The people in charge of the project were arrested one by one.

There are also workers who were responsible for pouring concrete back then, who are also searching, and they are focusing on searching.

After the concrete pouring is completed, it also needs to be vibrate, especially the vibration of the bridge pier, which is extremely high and can not have any construction defects.

After the maintenance, professional quality acceptance is required.

So, the corpses were watered in the piers, how did they pass the acceptance back then?

Is the worker in charge of vibrating one of the murderers?

One of the reasons why it is said is because there were seven people who died, and when the piers were watered, they could not be interrupted.

In other words, the four corpses and three corpses in the two piers where the bodies were found were at least watered at the same time.

That can't be done alone.

Because the project continues, it requires the coordination of multiple types of work.

Arrests and interrogations were carried out at the same time.