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

Everyone paid more attention to the situation through the pipeline, but due to special circumstances yesterday, Lu Chuan did not let the criminal police in.

From the current point of view, there is indeed a ventilation duct, which is the passage for the suspect to enter and exit. If the other party enters and exits from the entrance on the rooftop, then there must be another entrance and exit.

Investigate the entrances and exits of all ventilation ducts to see if there are any signs of unauthorized prying. This may help determine the location from which the suspect initially entered the ventilation duct, thereby identifying him.

"As for the fingerprint screening, we still need to continue. On the one hand, although we have investigated all the people who entered and left the Yuanfang Building on the day of the crime, is there a situation where the suspect entered the building in advance and did not come out in the meantime? In this case, he may have entered the building a few days, two days, three days or even longer before the crime. In this case, we may not be able to find his fingerprint information."

Lu Chuan made the following arrangements.

"So Chen Jiang, you still need to be more meticulous in your work. Check out the surveillance footage of Yuanfang Building from the previous two days and three days. Also, check with various companies to see if there are any of these people who have been on duty in the building for several days and have not left. You need to investigate this situation again."

"Yes, I'll 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 there are any of these people. There is a shift change or a cover shift.

If the situation cannot be analyzed thoroughly, we should also check whether there are any maintenance personnel from outside the building in the past two days to investigate the situation. All people who enter the building must be investigated without exception."

"Yes!"

Lu Chuan looked at Sun Biao.

"What's the status of the water damage investigation and analysis?"

Sun Biao quickly said: "Pure water!"

"After we collected the water stains on the rooftop, although there were some impurities mixed in, the identification agency was able to confirm that the water stains were pure water. We roughly checked and found that the most popular pure water currently sold is Hahawa Pure Water. It sells more. We have reviewed the videos of all the supermarkets and convenience stores nearby that sell Hahawa Pure Water. This morning, we were able to review all the videos and come up with a result."

Lu Chuan nodded.

There are many possibilities here.

No water storage containers were found on the platform, so the other party might have used plastic bottles or other thermos bottles. No matter which one it was, as long as the water quality can be identified, it is possible to find the suspect based on this.

The results obtained so far are relatively good. The water has been identified as pure water. However, it is impossible to get pure water by boiling water in a normal household.

Currently, the most popular brand of purified water on the market, or the only brand that Lu Chuan has ever heard of, is Hahawa purified water.

Of course, there is also a possibility that although the suspect drank this kind of purified water, it was not necessarily bought near the Yuanfang Building, and it was not necessarily bought by him. It is also possible that he drank this kind of water when he worked in a company in the building, so it is also possible that he just picked it up.

But no matter what, this is a clue. Now that we have this clue, we may get unexpected results if we follow it.

Solving a case requires knowledge and not a single detail can be missed. Regardless of whether there is a possibility of finding a good result in the end, as long as certain clues are found, they must be followed up and investigated until the suspect is found, or until the clue is completely interrupted.

When Lu Chuan was in the police academy, he had studied a case in which three people were killed and 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 stuck in the deceased's mouth, causing him to suffocate to death.

The conditions for investigating this case were very good at the time, because the suspect left his body fluids when he raped and killed the victim, which meant that it was very convenient to extract DNA. In addition, there were also dandruff and hair left by the suspect.

So the police subconsciously ignored some other clues at the time and focused all their attention on DNA identification.

The result is that the case has not been solved for 10 years because the DNA results have not been matched.

On the contrary, when the provincial department was investigating backlogged cases in various places, this case was retrieved again and an expert raised the question of why the origin of the mineral water bottle was not investigated at that time.

Because when this case happened, mineral water was not very popular. After the final testing, the suspect's DNA was indeed found in the five mineral water bottles found at the crime scene. That means the mineral water bottles must have been brought to the scene by the suspect.

There is a convenience store less than 1 kilometer away from the crime scene, and this mineral water is sold in that convenience store.

There were surveillance cameras installed in the convenience store at the time, but when people went to look for clues 10 years later, the surveillance cameras had already been damaged. Even the owner of the convenience store had completely forgotten some of the circumstances from 10 years ago.

If other clues at the scene could have been tracked and analyzed at the same time as the DNA identification was done, it is very likely that this person would have been caught that year.

Unfortunately, this clue was missed at the time, and they only did a DNA analysis, thinking that this would be enough to match the suspect.

As a result, all the men within 200 kilometers of the crime scene were arrested. After the comparison, no suspect was found. The case had to wait for 10 years. Ten years later, another case finally implicated this case.

So Lu Chuan learned this lesson in the process of handling the case, no matter what means he used, whether high-tech or traditional visits, investigations and screenings.

As long as any clues are discovered, people will be sent to track them down and investigate until the case is solved or the clues are interrupted.

This case report and analysis meeting will be very short.

The meeting was over and the pipeline robot arrived.

Distant Building.

On the rooftop, staff were operating a pipeline robot to go inside the pipeline to investigate relevant situations.

"Here's a fingerprint."

Soon, the surveillance camera inside the robot fed back very clear image information and found a very clear fingerprint.

"Take a photo and have it compared with the camera." (End of this chapter)