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

Criminal Police Brigade.

The atmosphere in the meeting room was rather depressing. Everyone thought that the case would be able to find a good conclusion, but the result was unexpected.

Fingerprints found in the ventilation duct at the crime scene were not successfully matched to anyone in the building.

"Is it possible that we missed someone? Is it possible that the other party entered and exited the building in other ways without being captured by the surveillance?"

Sun Biao asked a question.

Chen Jiang shook his head.

“That’s not very likely.

There are only two entrances to the building. One is from the main entrance lobby. All people entering the lobby need to swipe their cards.

There are security guards in the hall, so if the other party wants to enter without swiping the card, it is unlikely. Of course, even if the other party does not swipe the card, it can be seen in the surveillance. However, we checked all the surveillance and compared all the people who entered the hall one by one. We are sure that no one is missed. "

"The other exit is the underground parking lot. There are a total of 6 elevators in the underground garage. One of them is broken. There are surveillance cameras in the elevator halls of these 5 elevators, and license plate scanning is required when entering and exiting the building."

"In order to prevent anyone from being missed, we compared all the vehicles with the person captured by the elevator hall surveillance camera."

“Nothing is missing.”

Chen Jiang can guarantee this. All personnel who entered Yuanfang Building through the two formal channels have been screened.

Not only that.

In addition to monitoring the personnel above, the property company also conducted a check on the internal personnel of all leasing companies facing Yuanfang Building.

On the one hand, the police conduct investigations through surveillance, and no one can fake this. On the other hand, the police conduct investigations through each company’s management of its own employees. Comparing the two, there is no way out.

Everyone in the building knew about Tang Meijuan's death by jumping off a building, so when the police asked for cooperation in the investigation, everyone actively cooperated very quickly. The relevant personnel information was compiled in a short period of time, and some companies even compiled the information more than once.

Not right.

If Tang Meijuan really committed suicide by jumping off the building, then the police might have just asked her questions and the case would have ended there. However, now that a large-scale investigation has been conducted on the people in the building and people who frequently go in and out of the building, many people have speculated that Tang Meijuan's death might not be that simple.

"Don't be discouraged. If the fingerprints haven't been matched, we still found hair inside and tested it through DNA testing to see if there are any clues."

Lu Chuan originally returned to the High-tech Zone Branch, but the fingerprints there were not matched successfully, so he came back again. Since this clue could not be matched, he had to start from other aspects.

"How's the flood situation?"

"No results yet."

Wang Zhaokai shook his head: "The equipment we use to test water quality here is relatively simple and cannot detect some of the subtle components in it, so we took some of it to a special testing agency, and the results will not be available until tomorrow morning."

When Lu Chuan's people went upstairs, they found that the puddle of water was quite large, about two to three hundred milliliters.

After being collected, it was more than 100 milliliters. "We need to speed up the identification of water quality. At present, the fingerprint has not been successfully matched, and the DNA identification analysis will take a day to get the results. So if the water analysis can be completed earlier, we can proceed to the next step earlier."

"Yes!"

The fingerprint was not matched successfully, and other work needs to continue. Tang Meijuan's personal interpersonal relationships are also being investigated intensively.

The next morning, the relevant work results were summarized again.

"Director Lu, let me first tell you the test results of the water.

We detected a small amount of saliva in the water, and the DNA component of the saliva has been found, but it has been compared with the saliva of the four Tang Meijuan, and it is not Tang Meijuan's saliva. That is to say, there was indeed another person at the front desk at the time. This person drank the water and may have spit it on the ground. "

This result made everyone very excited. When Wang Zhaokai first received the test results, he slapped his thigh.

"This test result is being compared with the test result of the hair found in the ventilation duct. After testing, the DNA information components that can be extracted show that 99.99% are the same. In other words, based on the DNA identification, the channel through which the second person on the rooftop left was the ventilation shaft.

Moreover, this person has definitely had contact with Tang Meijuan, and he definitely drank the water."

"it is good!"

This clue is important.

Although it is not necessarily possible to identify the suspect through DNA screening at present, it confirms the police's judgment on the nature of Tang Meijuan's death.

Although the police have determined that the true nature of Tang Meijuan's death may be homicide rather than suicide or accidental death, there is currently no real evidence to prove this.

All the evidence supports the police's speculation, but support and real proof are different.

At present, the police have found the DNA information of another person in the mineral water, and it is consistent with the definition information of the hair found by the ventilation management. This is enough to strongly prove that there was a second person on the rooftop when Tang Meijuan died.

Let’s not talk about whether this person is a criminal suspect for the time being, but as long as he tried his best to avoid the camera and appeared on the rooftop, then Tang Meijuan’s death is not unrelated to him.

After all, if Tang Meijuan died of natural causes, he would not have to hide from surveillance cameras.

"How's the internal investigation going in the ventilation duct?"

At that time, the police did not go directly into the ventilation duct. The first reason was not to destroy anything that might be inside. The second reason was that the scene was indeed dangerous. According to the information obtained from the property management, there was a section of the ventilation duct that was about 1 to meters long and was vertical. If it was slippery, the person might slide directly down, and the damage might be relatively large.

"I applied for two pipeline robots yesterday. They will arrive this morning. By then, we should be able to investigate the situation inside."

"Okay, we need to hurry up and get a result this morning. We need to detect the entire pipeline. In addition, we need to combine the architectural drawings from the property management company to determine where the ventilation outlets of the pipeline are. We need to check all the ventilation outlets clearly."

"In addition, all ventilation openings should be checked, and those that show signs of being pried open should be inspected closely."

"Yes!" (End of this chapter)