Not long after, Zhao Ming and the technical team arrived at the scene.
"Excuse me, Team Zeng, I'm late." Zhao Ming scratched his head.
"Why did you go, boy? It took so long to come here."
"I went to play live CS with my friends, the venue is a bit far from the city."
"Okay, life is quite colorful." Zeng Ping said with a smile.
"I want to practice the experience of gun battles, which will be useful in arresting criminals in the future." Zhao Ming said.
Zeng Ping didn't hold back on this, and found Lu Wen from the technical team and asked him to go to the toilet to collect fingerprints from the camera.
"Do you have anything from your boyfriend at home?"
"There is his water glass under the table." After speaking, Chen Luyan was about to reach for it.
"Don't move, let me do it." Wearing gloves, Han Bin took out a water glass from under the table.
"There are fingerprints." Han Bin handed the water cup to other members of the technical team to collect fingerprints.
"Team Zeng, are there any fingerprints on the envelope and USB flash drive?"
"No obvious fingerprints."
After a while, Lu Wen and another colleague of the technical team collected fingerprints, and used a portable police fingerprint comparison machine to compare fingerprints on the spot.
In this way, the investigation direction can be determined as soon as possible, and the time for solving the case can be shortened.
"Team Zeng, the fingerprints on the camera and the fingerprints on the cup are not the same person."
Zeng Ping responded, and handed the envelope and USB flash drive to Lu Wen. There were some inconspicuous fingerprints that could not be seen with the naked eye, but that didn't mean they didn't exist. They could be detected by chemicals and instruments.
Of course, if you're wearing gloves, or if you've been wiped, you won't leave fingerprints.
"Comrade policeman, can my boyfriend be cleared of suspicion?" Chen Luyan breathed a sigh of relief.
If this matter was really done by his boyfriend, she would feel even more terrifying.
Zeng Ping didn't answer. Although the fingerprints didn't match, he couldn't be ruled out as an accomplice. His boyfriend had the house key, so he was still suspected.
"Team Zeng."
At this moment, Li Hui, who was checking the surveillance, came back.
"Have you found anything?"
"I went to the monitoring room and asked. There are surveillance cameras at the front door, the hall on the first floor, and the elevator, but there are no surveillance cameras on the stairs, back door, and corridors of the apartment building." Li Hui said.
"That is to say, as long as the suspect knows the situation of the apartment, or checks the location in advance, he can completely avoid surveillance." Tian Li analyzed.
"Apartment buildings are different from residential buildings. There are usually only one or two buildings, and the security is worse." Han Bin said.
"According to the existing monitoring, have you found any possible personnel?" Zeng Ping asked.
"No."
"I think Miss Chen should check the surveillance to see if there is anyone she knows." Han Bin suggested.
Zeng Ping nodded: "In this case, it is more likely that an acquaintance committed the crime."
"I copied all the videos." Li Hui took out a USB flash drive.
Afterwards, Chen Luyan used the computer to watch the surveillance.
Han Bin and others discussed the case in a low voice from a little distance away.
"Captain Zeng, there are too many loopholes in the monitoring. Any suspect with a little brain will climb the stairs, so it is unlikely to investigate the monitoring." Li Hui discussed.
"I think, but her boyfriend is still suspicious. There is no sign of the door lock being picked, and there is no key to enter the door. There is no way to install the camera." Tian Li said.
"Isn't the fingerprints incomparable?" Zhao Ming said.
"Before the camera was installed, someone else might have touched it, and it might even be the fingerprint of the person who sold the camera." Tian Li explained.
"If this is the case, the case will be complicated." Li Hui said.
"Han Bin, tell me your opinion."
"I saw that camera just now, and I think the camera can be used as a direction for investigation."
"What kind of investigation method?"
"Since the camera is installed, it must be watched. The video in the camera must be copied or uploaded through the Internet, so that it can reach the suspect." Han Bin said.
"This is a good starting point." Zeng Ping nodded and analyzed:
"If it is a copy, the USB flash drive needs to be replaced frequently, and the suspect may have visited the victim's house more than once; if it is uploaded on the Internet, the camera must be connected to the wireless network."
"I saw it just now. The camera should be a video uploaded through the Internet. The suspect can monitor it with his mobile phone or computer." Han Bin said.
"The camera is hidden so secretly, surrounded by walls, the network signal is too far away to get through, which means that the suspect used the surrounding network." Li Hui said.
Han Bin took out his mobile phone, he just took a few photos of the camera, and observed carefully: "342"
"What's the meaning?"
"Internet account used by the camera."
"Are you talking about 342?" Chen Luyan interrupted.
"Do you know who's wireless network this is in the neighborhood?"
Chen Luyan opened her mouth wide: "This is my home, the network I linked to is 342."
"Does anyone know your network password?" Li Hui asked.
"Just me and my boyfriend."
"The network is also your boyfriend, did you help install it?"
"No, the landlord has already installed it when I came here." Chen Luyan said this, as if thinking of something: "By the way, the password is also set by the landlord, and he knows it."
"It seems that besides Ms. Chen's boyfriend, the landlord is also suspected." Zeng Ping said.
"But the landlord doesn't have a key either." Tian Li said.
"This is a bit preconceived. The landlord doesn't have a key now, but he had it before. Before Ms. Chen moved in, a camera may have been installed." Han Bin said.
"That's right." Tian Li suddenly realized: "The fingerprints collected on the camera should be compared with the landlord's fingerprints."
Zeng Ping walked over and checked: "Miss Chen, have you wiped the router?"
"The router is placed on the desk, and when the window is opened, it gets dusty. I often wipe this."
"The router is usually installed by people from the Internet company, and the fingerprints collected may not be my own." Han Bin said.
"Think about it, is there anything belonging to the landlord at home, or has his fingerprints been left behind." Tian Li said.
Chen Luyan frowned and thought for a moment, then shook her head: "The house has been rented for two months. After I rented it, I have already cleaned it. I can't remember it for a while."
"Did you press your fingerprints when you signed the rental contract?" Han Bin asked.
"I remembered that when I signed the contract, I didn't want to press it. The landlord suggested that both parties should be fingerprinted. He said it would be safer and more at ease."
"Take the contract."
A while later, Chen Luyan brought the lease contract, and the fingerprints were stained with inkpad, so there was no need to collect them, just compare them directly.
After some comparisons, Lu Wen confirmed: "The fingerprint on the rental contract completely matches the half of the fingerprint collected on the camera. This person is very suspicious."
Because only half of the fingerprint was captured on the camera, Lu Wen couldn't be 100% sure that it was the fingerprint of the same person.
However, this was enough for Zeng Ping and Han Bin.
In a case, the possibility of two people having the same half fingerprint is almost negligible.
(end of this chapter)