Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Chapter 204 Doubtful Points
Forensic technical work has progressed and significant discoveries have also been made.

"Teacher, one of the seven skeletons has been identified."

Extracting DNA information from bones has become more and more mature with the development of technology.

Previously, bone DNA extraction could only be performed from bone marrow, but later it can also be extracted from bone.

Of course, this has higher requirements for the purification of bone genetic material, as well as higher requirements for the accuracy of instruments for genetic material analysis.

Zhang Yuanchao was a little surprised when he received the appraisal report.

The identified skeletons were not compared from the missing persons.

It was the result of a DNA paternity test done in the system. The DNA of the skeleton and the father in the paternity test belonged to the same genetic inheritance.

That is to say they are brothers.

"Send the results to Director Li first, they can use them there."

In less than 5 minutes, the comparison results were sent to Li Donglin.

The arrests and interrogations at the front line were carried out at a rapid pace.

All the persons in charge related to the bridge project were unaware of these matters.

Moreover, it is a little strange that there were three workers who were responsible for pouring the piers, but these three people were not found.

Now, one of them has been found.

Zhang Wanxiang, a native of Lingshui County, went out to work 30 years ago and has never been heard from since.

The family member reported missing, but he was working in QZ City, but he didn't make any money, and he didn't go home for so many years.

The disappearance report back then was of course left alone.

Unexpectedly, 15 years ago, Zhang Wanxiang, who was working at the construction site of the Minghe Bridge, was finally poured into the piers he poured himself.

With the identity clue of the first person, the identification of the other skeletons will soon have a direction.

The three workers who were in charge of pouring the piers at that time resigned suddenly, and they have not been found now.

Looking at it now, it is estimated that it has been poured into the pier.

Forensic laboratory.

Lu Chuan's experiment on the bone's ossification time also got the desired result.

Combined with the chicken leg experiment of pouring cement on the bridge pier, Lu Chuan deduced the time when the bones in the bridge pier would become ossified.

The six corpses did not have much difference, and they were in the same period as the cement pouring period, but the corpse numbered No. [-] was somewhat different.

Compared with other skeletons, this skeleton took longer to ossify.

This is a problem.

According to the results of the forensic examination on the surface of the skeleton, the deceased was poured into the bridge pier after he died for a short time.

And according to the scars on the skeleton, the cause of death of the deceased was roughly judged.

However, the skeletonization time of No. [-] skeleton seems to be shorter than that of other skeletons.

In the dissection room, seven skeletons lay side by side on the ground, and Lu Chuan observed again.

"Have you found anything?"

Zhang Yuanchao stood beside Lu Chuan, watching Lu Chuan carefully observe the seven corpses.

Lu Chuan nodded and pointed to the No. [-] skeleton next to the No. [-] skeleton.

"Both skeletons were found in the second pier, and the external environment in which the bodies were ossified was the same."

Zhang Yuanchao nodded. Of the seven skeletons, the first four were all found in the first pier, and the fifth, sixth, and seventh were all found in the second pier.

Under normal circumstances, under the same external conditions, the time for corpses to ossify should be about the same, or even if there is a difference, it should not be too large.

At the very least, it is unlikely that after 15 years, it can be observed with the naked eye.

"In order to ensure the quality of the pouring of the piers, it must be poured in one go."

Lu Chuan understood what Zhang Yuanchao meant.

It's just like the conclusion that several Zhang Yuanchao's students came to when they checked the surface of the skeleton.

When these bones were poured into the pier, whether they were alive or dead, they were poured at the same time.

Of course, the watering at the same time here is not an instant.

Instead, it is poured before the hydraulic concrete solidifies, and most of the concrete used is pulled by the same truck.

At least from the same batch.

The reason is to ensure that the concrete marking heights of the same pier are consistent to the greatest extent.

Because, even with the same standard and mechanical control, there will be subtle differences in different batches of concrete.

Of course, there are very few things that can be done in reality, unless the supervision is very strict and the supervision is very powerful.

"The ossification marks of this corpse are heavier than those of other corpses, or in other words, the ossification time in the concrete seal is less."

Lu Chuan frowned: "This is a bit unreasonable."

Zhang Yuanchao nodded: "There are many reasons for this situation. For example, the deceased took special medicines, had special diseases, etc., which may cause this situation."

"Well, I need to analyze it specifically. I suspect it is drug abuse and needs to be tested."

For the identification and analysis of bones, in many cases, it is difficult to make an accurate judgment and analysis with the naked eye.

In most cases, instrumental assistance is required.

The verification result surprised Lu Chuan and Zhang Yuanchao.

In the skeleton of corpse No. [-], there is a large amount of acrylfentanyl.

"A drug addict?"

About 20 years ago, fentanyl-related drugs were included in the category of controlled drugs.

These drugs were known as new psychoactive drugs back then, and their excessive use has effects such as excitement, hallucinations, and anesthesia.

Twenty years ago, any use of the drug needed to be documented and used in limited numbers.

Zhang Yuanchao has been a forensic doctor for so many years, and he has seen more than one addict.

Moreover, it can be detected in bones after 15 years, which must be the consequence of long-term heavy use.

"After a large amount of such substances are used, the residual components will erode the bones, so the color of No. [-] bone is different from other bones."

"Report this situation to Office Li. This kind of drug has been controlled 15 years ago. If it is used in large quantities, there should be a record. Check it out and you may find out the identity of the other party."

Of the seven skeletons, one has been identified, and the other two are currently guessed to be the workers who poured the bridge piers back then.

Now people have been sent to collect the DNA information of their relatives for comparison.

But there is no clue about the identities of the other four corpses.

After Li Donglin heard the news, he immediately arranged for the Qinzhou Criminal Investigation Detachment to investigate.

A large amount of propylene fentanyl is used, if it is not a drug, it is prescribed by a hospital, and the use of this drug is all prescribed by a red prescription.

In any hospital, there is a saying that there is a saying that the medicines prescribed in red have to be seen alive or dead.

Even after more than ten years, you should be able to find the usage records.

Soon, the criminal police in charge of the investigation found relevant drug use information in the drug management system of the No. 1 civilian hospital in QZ City.

From 15 years ago to the present, there are only five patients who have used propylene fentanyl in large quantities.

Two of them are still alive and receiving regular treatment.

Two others died of illness ten years ago and 13 years ago.

Only one person, who entered the hospital for treatment 18 years ago, but abruptly discontinued 15 years ago.

(End of this chapter)