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

Qin Chuan discovered that some of the detailed information left by the suspect at the crime scene seemed to be coincidental, as if the suspect had really left it by accident.

Whether it is fingerprints or footprints, they all need to be judged and even identified and analyzed before they can be pointed to all of them.

So it is impossible that every time is a coincidence. Lu Chuan believes that there must be an intersection between the suspect and Gao Zhiyuan.

"What I don't understand now is that the murderer put the victim's severed finger into the plastic bag that Gao Zhiyuan used to throw away the garbage. Why were there some tea leaves in it? These tea leaves can't be Gao Zhiyuan's. Could they be the suspect's or did he get them from somewhere else?"

Lu Chuan never figured out this question.

This tea doesn’t belong to Gao Zhiyuan, so whose tea does it belong to?

Is it the murderer's? Why did he put these tea leaves in? Isn't this deliberately exposing his identity?

"So my suggestion is to investigate Gao Zhiyuan's interpersonal relationships, and also to compare and contrast Gao Zhiyuan's interpersonal relationship background with that of the victim Zhu Panpan."

In addition to this job, Lu Chuan also did some other work.

"Whether it's tea leaves or other garbage in plastic bags, I'm working on it. I've extracted some trace evidence and the Technical Identification Center will probably give me some results this morning."

Lu Chuan has basically finished his report.

He sat down and said, "Now we have to see if we can extract some DNA information from the trace evidence analysis of the things in the garbage bag. Then we can compare it with the DNA information left by the murderer in the victim's body. In this way, we may be able to find the real suspect."

Even if Lu Chuan is not found, we can still classify the DNA information in the black garbage bag.

The bag was thrown by Gao Zhiyuan, and there are his fingerprints on it, so the things inside should also belong to him or his family.

It would be interesting if DNA information that did not belong to any member of his family organization was detected in these things, such as the genetic information left on the Dahongpao tea stems that Lu Chuan was most concerned about, which cost tens of thousands of yuan per tael.

Of course, the possibility of detecting DNA information on tea stems is very small, unless the tea leaves have been chewed and some saliva remains.

Otherwise, it is difficult to determine ownership.

This is what Lu Chuan is most worried about.

After listening to reports from all sides, especially Lu Chuan's on-site survey technology report, Li Donglin readjusted the direction of solving the case.

The interpersonal relationships of senior employees of Aijia Supermarket were included in the key investigation scope.

At the same time, Li Donglin asked Wang Song to take the lead in checking all surveillance cameras near Gao Zhiyuan's home, especially places where trash cans could be seen.

As for Gao Zhiyuan himself, we also need to have detailed contact with him, find out from him where he usually throws garbage, and then identify all the people at that location.

Now that the staff has expanded to more than 3000 people, we don’t mind adding another thousand or two thousand people.

Li Donglin even made up his mind that if there was no major discovery at Gao Zhiyuan's home, he would collect DNA information from everyone in the community where he lived and then conduct a comparison.

Since there is no way to accurately snipe the suspect, Li Donglin's strategy is to use a shotgun, fire as many bullets as possible, and expand the clearing range as much as possible.

In this case, even if the other party hides deeply and does not leave any obvious clues, as long as they are within the suspect's range, they will have no chance of escaping.

Within three or four hours, the results of the identification of trace evidence on the black plastic bag from the provincial department's technical center were sent to Lu Chuan.

What Lu Chuan was most worried about happened. No genetic material was detected on the Dahongpao tea stems.

As a result, Lu Chuan's hope of identifying the suspect by comparing the genetic information on the tea stems with the genetic information in the victim's body fluids was dashed. However, the trace evidence analysis at the Technical Identification Center was not without any clues.

There are water stains left on the white stems.

By testing the water quality, it was found that it contained selenium content exceeding the normal level.

Selenium-rich water?
A place suddenly flashed in Lu Chuan's mind.

Dongzhou City is a major grain-producing province in the province, and its selenium-rich millet is particularly famous.

Not to mention that the province is well-known throughout the country and even the world, a lot of its grain is exported abroad.

At the same time, there is a selenium-rich spring in the northern suburbs of Dongzhou City.

Brewing tea with selenium-rich spring water is said to have the effect of delaying aging, and people who drink it can live longer.

Especially in Dongzhou City, drinking tea with selenium-rich spring water is a high-end enjoyment.

However, because the water flow of this selenium-rich spring water is relatively small, not much selenium-rich spring water is sold each year, and much of it is consumed internally.

Therefore, these selenium-rich spring waters are never sold on the market.

Dongzhou City even has a rationing system for these selenium-rich spring waters, and there are corresponding records of who gets the spring water.

This is interesting.

As for the information extracted from all the garbage in the plastic bag, such as saliva, feces, etc., it was basically confirmed that they belonged to Gao Zhiyuan's family.

A few years ago, the technology for extracting genetic information from carriers such as feces and urine was not yet fully developed.

Because the main method of extracting genetic information from feces and urine is to identify genetic information through the blood cells remaining in these carriers.

Normal human urine does not contain blood cells, but there will be some impurities such as cell walls remaining, which will be excreted from the body during the urination process.

This small amount of cell wall impurities can be determined through RNA genetic information.

As for feces, they generally contain blood cells, it’s just a matter of quantity. This is because when feces pass through the large intestine, they rub against the intestinal wall and will definitely cause skin damage.

However, normally this kind of damage is very small and invisible to the naked eye, but it does not mean that it does not exist.

Over the years, as the technology level of trace evidence identification has been continuously improved, the genetic information and carriers that were previously difficult to identify can now be identified more accurately.

The contents of the black plastic bag have been roughly analyzed, and now the key focus is on the distribution of selenium-rich spring water.

Li Donglin had no objection to Lu Chuan's application to investigate and review the distribution list of selenium-rich spring water.

However, what surprised Li Donglin was that these selenium-rich spring waters were basically allocated to some powerful people in Dongzhou City.

Either they are rich or they are powerful.

How could the Red Killer be related to such a person? (End of this chapter)