"If Tang Meijuan was indeed hurt by others, then between the person who hurt him and Tang Meijuan. If there is any dispute between them, they must be killed. Whether it is emotional, financial or other disputes, we must find out. My opinion is to start with the construction company where Tang Meijuan works. In addition, some people he knows should be carefully investigated.”
"The second key direction of investigation is to re-examine the rooftop. The other party cannot appear on the rooftop for no reason, nor can it disappear for no reason. It must have used some other means. Through our current We don’t know how to enter and exit the rooftop, so we need to conduct a thorough investigation of the rooftop to see if it is possible that all the equipment enters and exits the rooftop through other channels.”
"There are also water stains on the rooftop. It is impossible for this water stain to appear there out of thin air. It was either left by Tang Meijuan or by the criminal suspect who killed him. We saw from the surveillance that Tang Meijuan was leaving When I got out of the elevator and went to the rooftop, I only had a mobile phone in my hand, not mineral water or a water bottle.”
"So for the pile of water stains that appeared on the rooftop, we need to do two things. The first is to test the water to see if we can extract relevant DNA information.
Second, what kind of source does this water come from based on the water test results? Is it mineral water or purified water? ”
Lu Chuan's arrangement made everyone's eyes light up.
Indeed, by analyzing the material composition of water, we can determine whether the water is mineral water or pure water. We can even determine what kind of mineral water it belongs to based on the composition of related substances in the water.
There is also a judgment and arrangement about extracting relevant DNA substances from water, which makes everyone feel that this is also very feasible.
This water stain appeared on the rooftop. No matter what the reason was, why did it appear that it was someone who vomited it after drinking it? Or was it that someone directly poured out a bottle of mineral water, or was it someone who washed their hands or something else? What's going on.
But no matter what happens, this pool of water stains will not appear on the rooftop for no reason. Judging from the current situation, it is very likely that it was left by the person who murdered Tang Meijuan on the rooftop.
"At the same time, arrange for people to conduct inspections and other related tests on several convenience stores under the Yuanfang Building. After the results come out, I will ask for the surveillance videos of all those convenience stores who bought the relevant water, and all the information of everyone All should be included in the scope of key investigations.”
Regarding the relevant work arrangements, Lu Chuan's side was more detailed. Wang Zhaokai and others carried out the relevant work in an orderly manner according to the division of labor.
That afternoon, Lu Chuan and others went straight to the rooftop of Yuanfang Building and came to the crime scene again.
Compared with the first time when they focused on investigating the traces left by Gao Meijuan, this time the relevant personnel started on the rooftop. Investigate whether there are some passages that allow people to enter and exit.
"This... there are some relatively large ventilation ducts on the rooftop, but we are not particularly clear about the internal directions of these ventilation ducts."
The property manager did not expect the police to return to the Yuanfang Building so quickly and inquire about the conditions of some passages on the rooftop that allowed pedestrians to pass.
"Bureau Lu!"
The property management side did not provide any valuable information, but several people brought by Sun Biao made a major discovery when they checked on the rooftop.
"Bureau Lu, the ventilation duct here has signs of being pried."
Lu Chuan immediately went over to check.
Sure enough, there was a dust cover on a ventilation duct in the northwest corner of the rooftop that had signs of being pried.
"The prying marks are very clear and fresh. They should have been done recently. And judging from the prying marks, the other party should have done it from the Libu Bridge hole to the outside." Lu Chuan put on his gloves and observed the marks carefully. It was exactly what the criminal police officer who found signs that the ventilation cover had been pried said.
The traces are very clear, and the prying position is from the inside out. In other words, the other party should start to pry the dust cover inside the ventilation duct. After opening it, you can go back and forth. Moreover, this passage is relatively spacious and can accommodate approximately No problem for two adults.
"Bureau Lu, do you want to go down and check?"
Lu Chuan shook his head.
"We don't need to go down for the time being. Let's uncover the scene first and inspect all the traces on it to see if there are any fingerprints left behind. After that, we will go down and investigate to see if this ventilation duct is actually connected. Wherever it goes, if a criminal suspect really comes in and out from here, he will definitely leave some biological traces and he can be found easily."
After making this discovery, the criminal police immediately came to the scene. The relevant on-site investigation was completed about two hours later.
"Bureau Lu, we have found that at this entrance and exit, we have collected three sets of fingerprints that are relatively clear. Now we will conduct comparison and identification when we go back. In addition, I suggest that all personnel in the building should collect fingerprints, and then it will be convenient for us. For comparison, we also found two hairs inside. We can do DNA identification analysis immediately after we return.”
very good!
Lu Chuan also did not expect that he would make such a big discovery when he surveyed the rooftop for the second time, and they all had directional clues.
The focus of relevant work has all shifted to the investigation of the rooftop, and the investigation of Tang Meijuan's interpersonal relationships has also been temporarily terminated here.
Read the original text in Liu#9@书/吧!
After making this discovery, Lu Chuan and the others spent the night collecting fingerprints from all the people who had entered and exited the Yuanfang Building on the day of the crime, comparing them one by one according to the surveillance cameras.
There is only one entrance to the Yuanfang Building. Everyone has to pass through the surveillance in the hall when entering or exiting, so there is basically no way to hide themselves. The collection work here was soon completed.
At the same time, the criminal police brigade met two criminal policemen who opened the door and began to compare the fingerprints.
"Bureau Lu, I didn't expect that this case was solved so smoothly and such important clues were found."
Wang Zhaokai was still in a relatively relaxed mood. At the beginning, when it was determined that Tang Meijuan's death was a homicide, everyone was still relatively nervous because no trace of the suspect was found in the surveillance cameras. There was nothing left at the crime scene, so all the clues were not very specific.
Unexpectedly, at this moment, such a big discovery was made on the rooftop.
"Let's wait for the results. It depends on whether the fingerprint comparison can be successful."
However, things didn't go as expected.
There were a total of more than 1,000 people in the Yuanfang Building who collected fingerprints for comparison and analysis. Although it took a lot of time, after one day and one night, the entire fingerprint comparison was completed, but no one was successfully compared. (End of chapter)