Police Chen Shu

Back at the Criminal University, Chen Shu came to Huang Mao's office and asked Zhu Yiba and Huang Mao if they had noticed anything unusual on the video surveillance.

Video investigation is a technical activity, which is handled by specialized technical personnel in the criminal investigation brigade. In places where individual cases occur frequently, special video investigation squadrons may even be established.

There are two tasks. One is to go to the scene to dispatch the police, and then search for civilian videos near the crime scene. If there is any video surveillance of the scene, you must copy it one by one;

The second is to sit in the office, pour yourself a pot of tea or make some coffee, and then spend a long time studying and making judgments. If you have to compare, it's a bit like playing an advanced version of the "Spot the Difference Game", which consumes brain cells and eyes very much.

Ordinary people think that this video investigation is just surveillance, and that it is a very simple matter, just look at the screen to find the suspect.

In fact, this is not the case. The knowledge in it is very great.

For example, the Public Security University and the Criminal Police College have set up special video investigation majors for local visual investigation personnel to study and further develop. They are often held in several consecutive courses, because it is impossible to understand them in a week alone to strengthen them.

And with the development of science and technology, the information technology included in this thing has increased exponentially. After all, it is a new technology and it is still a blue ocean in this field.

In addition to the necessary knowledge, checking monitoring is similar to pulling call orders. Both require enough patience and a long time, and both are indispensable.

After getting the answer that everything was normal for the time being, Chen Shu copied the video to another computer and started video investigation work at the same time, but he only picked the camera in the corridor where the crime was found.

Then, I started watching slowly, frame by frame.

He stared at the screen for a moment without blinking, but Chen Shu's mind kept spinning rapidly, thinking about the relationship between the curtain cloth and the mud grass.

Curtain cloth, mud grass;

Upstairs, downstairs.

The three of them stayed in the office for a whole afternoon without finding any clues. After Ma Rongcheng came back from the on-site re-examination, he brought back a bunch of fingerprints and planned to throw them all into the fingerprint bank later.

At that time, the person corresponding to the fingerprint will be compared with the hotel check-in information. If there are extra people inside, there is a high probability that they will be criminal suspects.

In the eyes of Ma Rongcheng, a professional technical policeman who came from the provincial department to provide support, this was a relatively stupid method that did not reflect his expert status.

Ma Rongcheng patted Chen Shu on the shoulder and motioned to move.

After sitting down, Ma Rongcheng entered a website address, uploaded the copied hotel video to the website, and hit Enter to end it.

Looking at the steadily rising progress bar and percentage on the screen, Ma Rongcheng smiled easily, showing his masterly demeanor, and then led a few people downstairs for dinner.

In the restaurant, Ma Rongcheng held up his chopsticks and introduced with a little pride.

"The Woan intelligent video investigation system is supported by modern technologies such as big data, cloud computing, and the Internet of Things, and uses artificial intelligence research and judgment as a means to integrate various digital services on the public security intranet to provide comprehensive perception and comprehensive analysis."

"Teacher Ma, is this the Sky Eye system recently launched by our Ministry of Public Security?" Jiang Hai continued to maintain the learning attitude that a student should have.

Ma Rongcheng replied with a smile: "It's different. The Sky Eye system integrates our police's own surveillance equipment, and the Wo'an system is mainly used to analyze civilian surveillance videos."

The two people's questions and answers also made Chen Shu and others who were watching sigh with emotion. With the development of social science and technology in the current society, various investigation techniques are emerging one after another. This is something that can really help.

Unlike in the early years, except for the fact that the police wore uniforms that were different from ordinary people, they basically investigated cases in a hurry-up style, using the most primitive methods, such as platoon visits.

The expenditure on police, material and financial resources and the severity of the case are completely out of proportion.

After the group finished eating, they returned to the office. The system analysis results were already on the computer.

Jiang Hai respectfully pulled out the chair and let Ma Rongcheng sit in front of the computer as if he had it all to himself. The others stood in a semicircle behind the expert and looked at the analysis report on the computer together.

There were words filling half the screen, but when I looked carefully, there was nothing there.

According to the conclusion given by the system, in the videos taken within 20 days of the incident, this intelligent system, which was said to have cost astronomical amounts of money to develop, did not find any suspicious persons.

Everyone couldn't help but feel a little discouraged.

Taking into account the possibility of the suspect returning to the scene a second time, Chen Shu suggested that the video surveillance data within a week after the incident should be copied to the software for analysis.

The second return to the scene mentioned here means that after the criminal leaves the crime scene, there is a high probability that he will return to the crime scene after a period of time.

This is supported by real-life cases, and there are quite a few.

In the first category, criminals may have a high tendency to seek stimulation, and their purpose of committing crimes is to seek adventure, excitement, and inner satisfaction.

After the crime left the scene, he returned to the crime scene. This behavior will give them a stronger psychological stimulation than the crime.

In the second category, offenders return to the scene to confirm the consequences of their previous criminal behavior. For example, was there any evidence left at the scene that could identify them, or was it possible to destroy evidence they accidentally left behind during their previous crimes, or to observe the progress of the police investigation.

From a psychological perspective, it is to avoid the police.

Probably the above two categories, the first category is extremely rare, and most of them belong to the second category.

Jiang Hai, who also belonged to the police academy faction, seemed to understand. He habitually moved in the direction of Chen Chuan next to him. When he got closer, he asked in a low voice: "Brother Chuan, why do these people return to being police officers after committing crimes?" At the scene? Isn’t this looking for death?”

Chen Chuan hugged his chest, looked at his junior brother with squinting eyes, and said disdainfully: "Small, will you look back after you poop?"

The words are rough and the reasoning is not rough.

While Jiang Hai was shocked, he actually recalled it.

After the reaction, he felt a little confused. The young police academy student didn't know whether he was right or wrong to ask this question to this unreliable senior brother.

Here, as an expert, Ma Rongcheng immediately agreed to Chen Shu's suggestion, and then asked Huang Mao to go to the hotel to retrieve the recent video again. After Huang Mao came back from the hotel, he put the video into the software and analyzed it again. .

The computer fan was blowing hard like an old cow panting, but the results of the analysis still showed that there was no suspicious person.

Ma Rongcheng couldn't help but feel a little embarrassed. He had just been promoting the Wo'an system for a long time, but after a fierce operation, he found nothing useful at all. This expert from the provincial department couldn't help but feel embarrassed and intuitive. The chair was hot under my butt.

"Why don't you let Old Tang dissect the corpse?" Ma Rongcheng chose to escape and suggested.

Jiang Hai immediately took out his mobile phone, looking forward to it, but he still knew that he couldn't make the decision, and his tone was inquiring: "I'll contact Teacher Tang when I come?"

As he spoke, he suddenly lost his temper and murmured: "I guess the family may not agree to the autopsy."

Ma Rongcheng looked at the little brother with an unusually expressive expression in front of him and said cheerfully: "For an autopsy of an abnormal death, you only need to notify the family of the deceased, and there is no need to obtain their consent."

"Is there still such a thing?" Jiang Hai jumped up, picked up his cell phone and made a dialing gesture, but looked at his senior brother aside.

Chen Shu didn't express his position. He just stared at the analysis report on the computer monitor, held his chin, and thought.

I have to say that this Woan smart video is still a bit high-level. Although the analysis conclusion seems a bit rigid and mechanical, some tedious data are clearly counted by this system.

Pulling up the form, the time, place, and people are clear.

After it is connected to the personnel information of the public security intranet, as long as the person's face is clearly shown in the surveillance, even the person wearing a mask can display their personnel information one by one.

Then, behind each person, the total length of time they appeared in the surveillance is marked.

Click on a person's name, and a list of the time the person appears in the video and the corresponding videos will pop up.

The top ones are naturally the hotel staff, and the following ones are Kunming locals who often come to the hotel. According to normal investigation logic, these people should be investigated one by one.

But Chen Shu and the others were policemen from other provinces after all, so it was really hard to do this kind of investigation work without permission.

Chen Shu stared at the names on the screen and subconsciously looked at the person ranked first among them, that is, the person who had been in the video the longest.

Amei Zheng.

As a hotel cleaner, Zheng Amei's job is to clean the rooms on each floor that have been checked out by guests. Those who run up and down are naturally the staff members who have been there the longest and passed through the most areas among everyone.

This man was also the first person to discover the murder scene.

That day, since Chen Shu, Chen Chuan, Jiang Hai and others were all present at the scene, after Zheng Amei opened the door and screamed when she found the body, the three of them quickly entered the room and discovered the deceased.

Therefore, Chen Shu and others took it for granted and subconsciously believed that they were also the first to discover the body, thus ignoring Zheng Amei who was the first to discover the body.

This hotel staff has extremely low presence.

The problem lies here.

Chen Shu raised his eyebrows. This case seemed to be starting to take shape, but he also knew in his heart that the real challenge had just begun.