Chapter 204: Lots of Doubts
Forensic technical work 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 the 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 the missing persons.
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 is to say, they are brothers.
"Send the results to Li Chu first, 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 went as fast as lightning.
All those responsible for the bridge project at that time were unaware of these matters.
Also, one thing is strange. There were three workers in charge of pouring the bridge 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 thirty years ago and has not been heard from since.
My family reported me missing, but I was working in QZ City, but I didn’t make much money, and I haven’t been home for so many years.
The disappearance report that year was naturally ignored.
Unexpectedly, fifteen years ago, Zhang Wanxiang, who was working at the Minghe Bridge construction site, 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.
There is not much difference among the six corpses. They were from the same period as when the cement was poured, but the corpse numbered No. 6 is somewhat different.
Compared with other skeletons, this skeleton took longer to become white.
This 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.
But the time it takes for Skeleton No. 6 to turn into bones seems to be shorter than the time it takes for other skeletons to turn into bones.
In the autopsy room, seven skeletons were lying side by side on the ground. Lu Chuan observed again.
“Anything found?”
Zhang Yuanchao stood beside 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 these two skeletons were found in the second pier. The external environment for the skeletons to be skeletal is the same."
Zhang Yuanchao nodded, seven skeletons, the first four They were all found in the first pier, and numbers 5, 6 and 7 were all found in the second pier.
Generally, 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.
"To ensure the 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 examined the surface 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 done 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 markings of the same bridge pier are highly 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, in reality, very little can be done, unless the supervision is very strict and the supervision is very powerful.
"The bones of this corpse are heavier than those of other corpses, or in other words, it took less time to become bones in the concrete seal."
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 cause this situation."
"Well, we need to analyze the details. I suspect drug abuse and need to be tested."
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.
“Addicts?”
About twenty years ago, fentanyl-based drugs were included in the category of controlled drugs.
These drugs were called new psychoactive drugs at the time, and excessive use can have stimulant, hallucinogenic, narcotic and other effects.
Twenty years ago, any use of this drug needed to be documented and used 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 extensive 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 situation to Director Li. This type of drugs 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."
Seven Among the skeletons, one has been identified, and there are two others. It is currently speculated that they are workers who poured the bridge piers.
People have been sent to collect the DNA information of his relatives and prepare for comparison.
But the identities of the other four corpses are not yet clear.
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 corpse-like.
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 are only five patients who have used acrylonitrile and 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.
(End of this chapter)