Everyone pays more attention to the situation on the pipeline side, but due to special circumstances yesterday, Lu Chuan still did not let the criminal police in.
From the current point of view, it is true that the ventilation duct is the passage for the suspect to enter and exit, so if the other party enters and exits through the entrance on the rooftop, then there is another entrance and exit.
Investigate the entrances and exits of all ventilation ducts to see if there are any signs of unauthorized prying. You may be able to locate the location where the suspect first entered the ventilation ducts and thus the identity of the suspect.
"As for the fingerprint screening, we still need to continue. On the one hand, although we have investigated all the people who entered and exited the Yuanfang Building on the day of the incident, is there such a situation? If the suspect entered the building in advance and did not come out in the middle, then this In this case, he may have entered the building at this time a few days, two or even three days ago, and we may not be able to check the other party's fingerprint information. "
Lu Chuan made the following arrangements.
"So regarding Chen Jiang, you still need to be more meticulous in your work. You need to adjust the monitoring of the Yuanfang Building for the first two days and three days, and check with various companies to see if these people are in the building. If you have been on duty for a few days and haven’t gone out, you need to sort out this situation again.”
"Yes, I will arrange it after the meeting."
Lu Chuan nodded and continued: "There are also property staff in the building. They must be on duty. Let's see if these are mentioned. There happens to be a shift change or someone who is on duty. situation.
It is impossible to analyze the situation thoroughly, and whether maintenance personnel from outside the building have come over in the past two days to sort out these situations. Everyone who enters the building must not miss anyone, and they must be checked. ”
"Yes!"
Lu Chuan looked at Sun Biao.
"What is the status of the water damage investigation and analysis now?"
Sun Biao quickly said: "Pure water!"
"After we collected the water stains on the rooftop, although some impurities were mixed in, the appraisal agency could confirm that the water stains were pure water. We roughly checked that this kind of pure water is currently sold more widely than Hahawa pure water. Selling. There are more. We have reviewed the videos of all nearby supermarkets and convenience stores that sell Hahawa purified water. We can complete the research on all the videos this morning and then we can come up with a result.”
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Lu Chuan nodded.
There are many possibilities here.
There is no container for storing water found on the platform, so the other party may be using plastic bottles or other thermos bottles. No matter which type it is, as long as the water quality is identified, it is possible to find it based on this. suspect.
The results obtained so far are also relatively good. The results identified it as pure water, so there is no way to get pure water by boiling water in normal households.
Currently, there are more purified water on the market, or the only brand Lu Chuan has heard of is Hahawa purified water.
Of course, there is also a possibility that although the criminal suspect drank this kind of pure water, he did not necessarily buy it near Yuanfang Building, nor did he buy it. Maybe he works in a company in the building and drinks this kind of water, so it's possible that he just picked it up.
But no matter what, this is a clue. Now that you have this clue, if you follow it, you may get unexpected results.
The understanding of solving a crime and not a single detail should be missed. No matter whether there is a possibility of finding a good result in the end, as long as you find some clues, follow them and investigate until you find the suspect, or Keep checking until this clue is completely broken.
Lu Chuan studied a case before when he was in the police academy. There was once a case in which three people were killed. The suspect left five mineral water bottles at the crime scene.
Two of the five bottles were used by him, and three water bottles were blocked in the mouth of the deceased, causing him to suffocate to death.
The conditions for investigating this case were very good at that time, because the suspect left his own body fluids when he raped and killed the other party, which meant that it was very convenient to extract DNA. In addition, there were also skin flakes and hair left by the suspect. .
Therefore, the police subconsciously ignored some other clues at that time, and everyone focused on DNA identification.
As a result, this case has not been solved for 10 years. The reason is that the DNA results have not been compared.
On the contrary, when the provincial department was sorting out the backlog of cases from various places, after the case was retrieved, an expert asked why the origin of the mineral water bottle was not investigated at that time.
Because when this case occurred, mineral water was not very popular. After final testing of the five mineral water bottles found at the crime scene, the suspect's DNA was indeed found, which means that this mineral water bottle The child should be the suspect brought to the scene.
There is a small shop less than 1 kilometer away from the crime scene, and this mineral water is sold by that small shop.
At that time, the tuck shop was equipped with surveillance cameras, but when we looked for this clue 10 years later, we found that the surveillance cameras had long been corrupted. Even the owner of the tuck shop had forgotten all about some of the situations 10 years ago. .
If other clues at the scene could also be tracked and analyzed while doing DNA identification at that time, it is very likely that this person would have been caught that year.
It's a pity that this clue was missed at the time, and only DNA identification analysis was done, thinking that this would be able to identify the suspect.
6◇9◇Book◇Bar
As a result, all men within 200 kilometers of the crime scene were killed. After folding, no suspect was found, so we had to wait 10 years for this case to finally be implicated in another case.
Therefore, Lu Chuan learned this lesson in the process of handling the case, no matter what method it was, whether it was high technology or traditional interviews and investigations.
As long as there are clues discovered, then send people to pursue and investigate until the case is solved or the clues are interrupted.
This time the case briefing and analysis meeting will be very short.
The meeting ended just as the pipeline robot arrived.
The distant building.
There are staff on the rooftop controlling the pipeline robot to go into the pipeline to check the relevant situation.
"There's a fingerprint here."
Soon, the surveillance camera in the robot fed back very clear picture information, and a very clear fingerprint was found.
"Take pictures and let them compare." (End of Chapter)