Technical work in forensics has progressed and major discoveries have also been made.
"Teacher, the identity of one of the seven skeletons has been confirmed."
Extracting DNA information from skeletons has become more and more mature with the development of technology.
Previously, skeletal DNA could only be extracted from bone marrow, but later it could also be extracted from bone.
Of course, this requires higher requirements for the purification of bone genetic material and higher instrument accuracy for genetic material analysis.
Zhang Yuanchao was a little surprised when he received the appraisal report.
The identified skeletons were not selected from among the missing people.
It is the result of a DNA paternity test done in the system. The DNA of the skeleton and the father in the paternity test belong to the same source of inheritance.
That means they are brothers.
"Send the results to Chu Li first, so they can use them."
In less than five minutes, the comparison results were sent to Li Donglin.
The arrests and interrogations on the front line were carried out as fast as lightning.
All those responsible for the bridge project at that time were unaware of these matters.
Moreover, one thing is strange. There were three workers in charge of pouring the bridge piers at that time, 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 thirty years ago and has not been heard from since.
The family member reported him missing, but he was working in QZ City, but he didn’t make much money, and he hasn’t returned home for so many years.
The disappearance report that year was naturally ignored.
Unexpectedly, fifteen years ago, Zhang Wanxiang, who was working at the construction site of the Minghe Bridge, ended up being poured into the bridge pier he had poured.
With clues about the identity of the first person, the identification of the other skeletons quickly became clear.
The three workers who were responsible for pouring the bridge piers suddenly resigned, and now they can't find them.
Looking at it now, it seems that it has all been poured into the bridge piers.
Forensic laboratory.
Lu Chuan's experiment on the bones' whitening time also got the desired results.
Combined with the chicken leg experiment of pouring bridge pier cement, Lu Chuan speculated the time of bone formation in the bridge pier.
Six of the corpses didn't have much difference. They were from the same period as when the cement was poured, but the corpse numbered No. 6 was a little different.
Compared with other skeletons, this skeleton took longer to skeletal.
There is a problem.
According to the forensic examination of the skeleton's surface, the deceased was poured into the bridge pier after a short period of death.
And based on the injuries on the bones, the cause of death of the deceased was roughly determined.
However, the bone formation time of Skeleton No. 6 seems to be shorter than that of other skeletons.
In the autopsy room, seven skeletons lay side by side on the ground, and Lu Chuan observed again.
"Anything found?"
Zhang Yuanchao stood next to Lu Chuan and watched Lu Chuan carefully observe the seven corpses.
Lu Chuan nodded and pointed to Skeleton No. 5 next to Skeleton No. 6.
"Both skeletons were found in the second pier, and the external environment in which the skeletons were skeletal was the same."
Zhang Yuanchao nodded. Among the seven skeletons, the first four were found in the first pier, and No. 5, 6 and 7 were all found in the second pier. .
Generally speaking, under the same external conditions, the time it takes for a corpse to turn into bones should be about the same, or even if there is a difference, it shouldn't be too big.
At the very least, it is unlikely that it will be able to be observed with the naked eye fifteen years later.
"In order to ensure quality, the pouring of the bridge piers must be done in one go."
Lu Chuan understood what Zhang Yuanchao meant.
Just like the conclusion that several students of Zhang Yuanchao came to when they did a surface examination of the skeleton.
When these bones were poured into the bridge piers, whether they were alive or dead, they were poured at the same time.
Of course, the watering here is at the same time, not in an instant.
Instead, it is poured before the cement solidifies, and in most cases, the concrete used is pulled by the same truck.
At least they are produced in the same batch.
The reason is to ensure that the concrete marking height of the same pier is consistent to the greatest extent.
Because, even with the same standard and mechanical control, there will be subtle differences in concrete from different batches.
Of course, very little can be done in reality unless the supervision is very strict and the supervision is very powerful.
"This corpse's bone formation marks are heavier than those of other corpses, or in other words, it took less time for bone formation in the concrete enclosure."
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 before his death, had special physical diseases, etc., which may have caused this situation."
"Well, we need to analyze it in detail. I suspect drug abuse and need to be tested."
In the identification and analysis of skeletons, in many cases, it is difficult to make accurate judgments and analyzes with the naked eye.
In most cases, instrumentation is required.
The verification results surprised Lu Chuan and Zhang Yuanchao.
There was a large amount of acrylic fentanyl in the bones of Corpse No. 6.
"Addict?"
About twenty years ago, fentanyl-related drugs were included in the category of controlled drugs.
These drugs were called new psychoactive drugs at the time. Excessive use can have stimulant, hallucinogenic, narcotic and other effects.
Twenty years ago, any use of the drug had to be documented and available in limited quantities.
Zhang Yuanchao has been practicing law for so many years and has seen more than one drug addict.
Moreover, it can be detected in bones fifteen years later, which must be the result of long-term and heavy use.
"After using a large amount of this kind of substance, the remaining components will corrode the bones, so the color of bone No. 6 is different from other bones."
"Report this to Director Li. This type of drug was controlled fifteen years ago. If it is used in large quantities, there should be records. If you check it, you may find the identity of the other party."
Among the seven skeletons, one has been identified, and the other two are currently speculated to be workers who poured the bridge piers.
Now, people have been sent to collect the DNA information of his relatives and prepare for comparison.
But the identities of the other four bodies remain unclear.
After Li Donglin learned the news, he immediately arranged for the Qinzhou Criminal Investigation Detachment to investigate.
A large amount of acrylic fentanyl is used. If it is not a drug, it is a hospital prescription, and the use of this drug is always with a red prescription.
In any hospital, red-prescribed drugs are said to be life-threatening or fatal.
Even after more than ten years, the usage records should still be available.
Soon, the criminal police responsible for the investigation found relevant drug use information in the drug management system of QZ City First People's Hospital.
From fifteen years ago to now, there have been only five patients who have used acrylonitrile-fentanyl extensively.
Two of them are still alive and receiving regular treatment.
Two other people died of illness ten and thirteen years ago respectively.
Only one person entered the hospital for treatment eighteen years ago, but it was suddenly interrupted fifteen years ago.
