But it doesn't mean that the police's judgment was wrong. On the contrary, the ventilation duct that Lu Chuan and the others found on the rooftop should indeed be the passage for the suspect to enter and exit.
But the other party should be more careful. He didn't leave any fingerprints inside, so he was probably wearing gloves. And according to Lu Chuan's judgment, the other party should be wearing special non-slip gloves inside, because the entire ventilation duct was covered with Made of stainless steel.
The reason is that according to the description of the worker, they all have professional tools, so the marks on the dust cover of the ventilation duct are not left by him, and they will not leave any marks during installation or removal during maintenance.
Maintenance workers would not leave any pry marks on the dust cover, so this mark must have been left by someone else, most likely the murderer of Tang Meijuan.
At the same time, some clues were found by tracing the situation related to pure water.
It's just that the clues are vague. They did find records of people buying this kind of mineral water in some convenience stores and supermarkets around the Yuanfang Building. After comparing it with the people in the Yuanfang Building, there were also overlaps, but based on this alone, they thought It is still too vague to determine who the murderer is, and the workload is also very heavy.
It is a clue, but it is impossible to identify the suspect in a short period of time. In addition, some companies purchase large amounts of this pure water internally.
If the criminal suspect took the pure water from the company and did not buy it outside at all, then the investigation outside may not be of much value.
But in this situation, no clue can be given up.
"We still need to continue to investigate and pull out the list of all the people in Yuanfang Building who have bought this kind of pure water in convenience stores and supermarkets outside, and then check whether there is any connection with Tang Meijuan. If not, we will put it aside for now. If there is, Those who contacted him should investigate where he was and whether there was any conflict with Tang Meijuan, or whether there was any financial dealings, and not let go of any clues."
Although there are some doubts at the crime scene, there are no pointing clues, so Lu Chuan's plan is to use the traditional investigation method to investigate bit by bit as long as there is hope.
And the first step is to copy back all the surveillance records of all surrounding supermarkets and convenience stores. In this way, even if the case is not solved now, the evidence will be left, and then we can slowly screen it and slowly If you do research, it is always possible to solve the case one day.
It cannot be said that one day a clue was suddenly discovered, and the directional clue was found in the surveillance system. Without this, it would have been missed. Then there would be flaws in the handling of the case, because the case was not handled carefully at that time.
On the night of the third day after the incident, the relevant investigation work had come to an end. The relevant groups from the Criminal Police Brigade were gathering together to discuss the next direction of investigating the case.
"Let me first report on the fingerprints in the ventilation ducts. At present, the fingerprints in the ventilation ducts can be definitely ruled out. They should not be left by the criminal suspect. After comparing these fingerprints with the workers who were working in the ventilation ducts three months ago, It is indeed his, but there is one thing that the hair we found in the ventilation duct is not a DNA match and does not match.”
"So my opinion is that all the people working in the distant building should be tested for DNA next, and then compared with the DNA information of this hair, it is very likely that the suspect can be identified."
This is the current survey report.
"Let me talk about the situation on my side. I am responsible for investigating the various interpersonal relationships between Tang and Mei."
Sun Biao spoke. "Judging from the current investigation, there is no conflict of interest between Tang Meijuan and people in the engineering company. He is usually kind and low-key, and has good popularity. I have not heard of anyone having financial dealings or major disputes with him."< br>
"Tang Meijuan had a boyfriend two years ago, but they broke up. When we investigated the call records, we did not find any connection between the two, and we contacted the other party by phone. The other party left more than a year ago. I don’t live here in Haizhou City.”
"So judging from the current investigation, the other party died due to emotional reasons. This possibility is actually relatively small. In addition, we found a clue during the investigation."
"Tang Meijuan once mentioned buying a BMW or Audi car when having dinner with her friends, and he also said that it is possible to buy a house by the end of this year."
"But I checked Tang Meijuan's bank statements and account balance. Her monthly salary is 6,000 yuan, and her savings are less than 80,000 yuan. This money may not be enough for her to buy a BMW or even a house. ”
"But following this clue, we investigated several BMW and Audi 4S stores in Haizhou City. We found out at the BMW 4S store in the eastern suburbs that Tang Meijuan asked about a situation related to the purchase of BMW cars, and she asked about one of them. A 5 Series model costs more than 400,000.”
"Tang Meijuan's monthly salary is only more than 6,000 yuan, and her savings are only more than 80,000 yuan. With such an economic situation, how can she buy a car worth more than 400,000 yuan? And she also wants to buy a house by the end of the year. I think this matter needs to be paid attention to. , we can investigate from this aspect. It seems that Tang Meijuan’s death has nothing to do with love at present, and it is basically confirmed to be a homicide. So I wonder if we can investigate from the economic aspect.”
There was a discussion on this point.
"I think this direction is feasible. He doesn't have too many emotional problems every day, and his own financial situation currently does not have any large expenses or income, but he actually wants to spend time with his friends. If he proposed to buy a car and went to a 4S store to view the car, is he about to have a large income that can support him to buy a car or a house? ”
"Don't forget that Tang Meijuan is the cashier of this engineering company, and she has been working in this company for a long time. She was there when the company was established."
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"I think everyone who works in engineering knows that there are a lot of things to do, and I think we should start with this engineering company. Did Tang Meijuan master some secrets about this engineering company, which led to her being silenced?"
"I also agree. Let's check it out from this engineering company and see if we can find any clues."
Lu Chuan nodded after hearing this.
This is indeed a direction.
"How is the investigation in other aspects, especially the ventilation ducts?"
Chen Jiang stood up: "There is a clue, it's huge." (End of Chapter)