Other traces on the note were tested the next morning, and sodium chlorate was found on the note, which happens to be the main ingredient in 84 disinfectant commonly used in schools and homes, while the available chlorine content was additionally detected at 6.1%. The team compared the disinfectant from the school's real building and found that the available chlorine content matched the chlorine content on the note, and it was basically certain that the note had appeared in the real building. The location of the real yàn building is not very far from the location of the library and the school bulletin board, which is the cut-off point between the two buildings, if you look at it from the upper floor of the real yàn building, you can completely overlook and observe the whole situation of the two locations, which is basically consistent with the previous inference of Mr. Lu.

Li Jing told Mr. Lu and Team Xiao about his investigation the day before, and that the suspect may be from the real yàn room, which is consistent with the evidence of the composition of the disinfectant found by the police on the note, so that the scope of the suspect can be initially narrowed down to the actual yàn room. The name tag of the person who had been to the scene was written on the name plate of the security captain who had been to the scene, so the police went to investigate the matter, and the other party was indeed a tall and strong young man, but he had a complete alibi that day, and the night before the incident, he was sent by the school to a research institute in the suburbs to attend a seminar because of the academic report, and he did not actually come back that night, which can be proved by the people who attended the meeting that day.

Wang Qing's testimony was confirmed with the meeting personnel, so who did the security captain see that day? When the police asked Wang Qing if he had recently lost his access documents in the real yàn room, or lent them to others, Wang Qing's eyes flickered, but immediately denied this statement, and the team saw that Wang Qing's expression was abnormal and knew that he was lying. After several persuasions, especially when she said that if she concealed something, she would be regarded as providing false testimony and attaching criminal responsibility, Wang Qingcai told the truth to the police with a blushing face.

The pass for the real building of the medical school is with a chip, and if it is lost, a large compensation will need to be paid. Because many of the results in the building involve the research results of some cooperative hospitals, they are confidential, and if they are lost, the school needs to replace the whole system, which is expensive. And this cost will be borne by the lost personnel, so generally those who can enter and exit the real Yàn building will hide it after losing the key card, and privately assign another key card outside, or go outside to match another one when they get the key card in case of emergency. Although it is a violation of the school's rules to do so, it is not only a high amount of compensation and may never be eligible to enter the real yàn room again. Most people choose this approach. Wang Qing has never lost the door card, but because he was afraid of losing it, Wang Qing privately matched another one when he got the door card. But I didn't expect so many people to do the same thing safely, and when he got there, something went wrong, which not only provided the suspect with the possibility of entering the real building, but also almost made the police suspect that he was the serial killer who used the campus legend.

When they knew about this incident, the police and Mr. Lu became nervous again, if this is the case, it is very likely that the murderer is not a member of the real room, and the scope of suspects who have just been reduced has been infinitely expanded. However, I actually knew that this person could enter and exit the real building, so the monitoring of the real building should be able to record this person's figure. Team Xiao retrieved the surveillance video of the real building. There are a lot of people entering and exiting the real yàn building, and if you check the posture of the people on the surveillance video, there may be a breakthrough. In addition, for the small store provided by Wang Qing to steal the key card of the real yàn building, he sought a location for the door card to make zuò. If the murderer is not a person in the school, he can successfully enter the real building with the access card, and he has the real information of the people in the real building, and he can also copy the card for himself according to the person who is the same size as himself, indicating that this first mover is likely to be able to contact the person who has access to the door machine card system, and it is not excluded that he is a staff member of the company with a copy chip card, and of course, it is still not excluded that other logistics staff in the school can contact the access control card system.

Let's talk about the store first, Wang Qing, who was wilting, took the school leaders and the police to the small shop that had secretly distributed the key card before. When I saw the police coming. The owner of the shop seemed to know the reason for the arrival of the police, and obediently handed over a booklet, which the police and the school opened to see that the one had come with the officer. Just now he also threatened to deal with Wang Qing's behavior of privately matching access control cards, and when he saw the name of the book full of pages and pages, the school leader's lips and hands kept shaking, and the original date actually started 2 years ago, but with good cultivation, he still gently put the booklet on the counter. It took a long time before he asked the boss why he wanted such a booklet.

Although the thin little boss had been prepared, it was the first time he had seen such a big battle, and he trembled and said that he was afraid that one day the school would blame him for helping students with access control cards, in order to alleviate his own guilt, he recorded every teacher and student who came here with access control cards, in case he really encountered a situation that could not be handled, he would let those who violated the school rules take responsibility with him, or provide some evidence to make up for the mistakes in the police. In the end, he even proudly said that he had to be prescient, otherwise he would have to bear the consequences alone.

Hearing his words, the police officers present at the time were simply crying and laughing and had to know what to say, the school leader was so angry that he could only open his mouth to the side, and Wang Qing, who saw the roster, was not as timid as he was just now, as if he was justified, after all, now that there is conclusive evidence, everyone in the whole building does this, and it is indeed unreasonable to punish him alone. In the end, Wang Qing said aggrievedly that he was a victim, and one of the deans was immediately dizzy by her irresponsible words.

After the chaos, the police officer who investigated the case at that time asked him which company he usually copied the door from and looked at it, and the owner of the small shop told the police with a look of embarrassment that in order to be cheap, he always found the company from the Internet casually, because everyone knows that it is illegal to copy this kind of access control card privately, so some stores only ask once and can no longer find it, but he still left the contact information of all the entrusted companies. The police saw that there were more than 20 of them, and because they were not sure which one the suspect might come from, the police had to bring back the roster and contact list. In addition, the school's logistics staff who had access to the access card were also investigated by another group of police officers, and even asked the security guards to confirm Zhang Yiyi one by one, but it turned out that they did not alert any suspicious people who were comparable to Wang Qing. Even the police did not give up and expanded to all the logistics staff, except for a few cooks and a few department heads, and did not find any reminders that it was a tall and strong man. After letting the security captain identify them one by one, he denied the possibility of knowing the suspects, and these people had clear alibi evidence at the time, so the clues of the school personnel to commit the crime were completely interrupted.

On the other side, Team Xiao took Teacher Lu with him. Li Jing and Shi Hao and their entourage began to study the surveillance video in the real building, and did not find any particularly useful clues, the real building has blind spots, but the front and rear doors of the real building are equipped with surveillance cameras. If you want to enter and exit the real yàn building and don't want to attract attention, the only way is to enter through these two gates, but unfortunately, neither gate has photographed tall and strong people entering and exiting, and this clue seems to have been interrupted. At a time when everyone was a little disappointed. Li Jing suddenly asked to watch the surveillance footage again. Although everyone didn't understand what he meant, but seeing Li Jing's eyes shining as if he had thought of something, Shi Hao still played the surveillance video again, and when he watched it again, everyone noticed that something was wrong - none of the employees who were photographed by the camera were fat.

This is too abnormal, if it is not a supernatural event, why is there no fat man in the surveillance video? Li Jing asked Shi Hao to keep freezing the picture, and then called another group of investigators to confirm to Wang Qing that he had been to the real yàn building on which day and at which time, Li Jing asked Shi Hao to keep rummaging in freeze frames, and finally when a certain one appeared, Li Jing shouted a pause. He pointed to the screen and asked Shi Hao to keep zooming in and out of the picture, and then pointed to one of the people on the screen and asked Team Xiao and Teacher Lu if they didn't think that person looked familiar.

Team Xiao and Teacher Lu looked at it, and in the enlarged picture, a slender version of Wang Qing walked into the real yàn building was clearly displayed. What's going on, could it be that Wang Qing gained weight like a balloon overnight? This is of course nonsense, but when it was determined that it was forgetfulness, Shi Hao immediately saw the clues, and he speculated that it may be that the angle of the camera lens is constantly stretching people, and all the surveillance pictures they see are deformed because of the camera angle, so they can't find a tall and strong suspect in the surveillance picture.

The question found the answer. But another question surfaced in the hearts of Team Xiao and Teacher Lu, could the suspect also know this feature of the surveillance camera, so that he could confidently and boldly enter and exit the real building without worrying about being discovered? After thinking of this, Team Xiao began to ask the school about who could enter and exit the monitoring room of the real building at will. Among these people, did anyone remind them to be the same as Wang Qing, but they got a negative answer.

If it's not the staff in the real building, then who else knows this secret? This time, even the founding board and some other leaders of the school were also suspected, and while they were still investigating, Li Jing put forward a different point of view. (I asked Shi Hao, and he also said that since then, Li Jing has always played a straight ball to solve crimes.) Sometimes they are very embarrassed, but everyone accepts Li Jing's straightforward style of doing things, but they still have an appreciative attitude towards a certain Cheng dù, which also makes Li Jing completely unaware that his style of acting may make others very unhappy. So later, when Li Jing and I first worked together, I would express all kinds of disgust with his poisonous tongue and conceit, and after Li Jing and I got along for a while, he understood why I always lost my temper with him at the beginning of the cooperation, and before that, he always thought that my character was just as hot as Xiàn in front of it, so that when he saw that I was gentle to others, he would have an illusion that the person he saw was only suitable for me to have the same face, but that's for later).

He thinks that the person who should be suspicious should not be the person who can come into contact with these videos every day, thinking that if they are really suspicious, the gray jujube will delete all the videos, so that everyone can not find any clues, obviously, these surveillance videos are usually not seriously inquired about, so there has been no deviation from the angle of the head. So now the suspicion should be that he can't have frequent access to the video, and there are people who know about this vulnerability, so he speculates that this suspect may have been in contact with the surveillance camera under some circumstances, and found this opportunity. What kind of situation does it take for outsiders to have access to surveillance cameras? The four people present immediately thought of the person who was maintaining the monitor.

When I asked the school for verification, sure enough, half a year ago, they had found someone to repair the camera, and re-wiring the computer room, and it was the school's information department that was responsible for this at that time, and the Xiao team went to the information department to ask the person in charge at the time to replace the surveillance camera, and the person in charge at that time had left the school and returned to his hometown. After some searching, I finally contacted the person in charge of this matter at that time. With his help, he was able to find the company that was repairing the cameras in the files he handed over.

I found the company that was repairing at the time, and found the person in charge to learn that two of the workers who participated in the maintenance at that time had left their jobs, and according to the identity information registered at the time, it was confirmed that the two had no possibility of committing a crime at all. But something strange happened, and one of the people under investigation said that he had never been to the city to do any maintenance work, which immediately aroused the suspicion of the Xiao team. In order to prove that he was telling the truth, that person also went to the local public security bureau to make a record. This laugh is really telling the truth to the doubters. He is a small contractor in charge of building houses in the local area, and usually helps people repair houses in the village. At that time, when the school was repairing the camera, he himself was helping the neighboring village to repair the road, and during that time, all the villagers could help him prove it, and because of the road repair, he was also on TV, not only the villagers could prove it, but the staff of several TV stations that interviewed him could also help prove that he was telling the truth. So many people don't all lie, and after watching the TV interview at the time, it is impossible to fake the actual interview.

If this is the case, then why does this person appear in the maintenance company, at the same time as the maintenance surveillance video of the medical school's real yàn building, the person is not going to doppelganger. So why are there two of them at the same time?

Team Xiao's first thought was that the identity information of this little brother was stolen, and when the company helped these employees to declare insurance, they only needed the employees to show their ID numbers, and only needed copies of their ID documents. Moreover, many informal maintenance companies do not require applicants to show the corresponding qualification certificates, as long as they can repair, they can be hired, so it will make people take advantage of loopholes. Later, the person in charge of the maintenance company recalled it, and remembered that it seemed that the person who had stolen someone else's identity had only been working in the company for a period of time, and suddenly came and left suddenly, and the company was changing managers at that time, so the management was also chaotic for a short time, so the suspect took advantage of the loophole in identity information. (To be continued.) )