In the large office of the special case team, a seminar on the explosion in the chemical laboratory of the University of Technology began.

Forensic doctor Yu Jing's task this time was very easy. She only had to report the number of deaths and the cause of death.

After the rest, Song Wa came to the big screen, and a blackened block appeared on the screen.

Song Wa said: "After comparison and analysis, we believe that the block in the picture is the heating plate in the instrument. We analyzed the material of the heating plate and found that the material of this piece is the same as the material of any component of the instrument.

no the same."

"Does that mean someone really replaced this heating plate?" Xia Lan asked in a deep voice.

Song Wa nodded, "Not only that, I compared the structural diagram of the instrument and found that replacing this heating plate requires several processes. If you are not familiar with this instrument, it will be difficult to complete the replacement.

In addition, students will conduct a simple inspection before each use, which means that the killer must not only complete the replacement, but also achieve perfect restoration."

Xia Lan understood, "The murderer is familiar with the detailed structure of the instrument, and also knows its principles and dangers."

"The murderer is really Professor Ming's student?" Xiang Fei was a little hard to accept. After a morning of adjustment, Xiang Fei had recovered a lot.

"Those who know the structure of the instrument are also workers involved in the production of the instrument." Meng Yuan analyzed, "But those people have no conflict with Professor Ming. In comparison, his students are more suspected."

After taking over the conversation, Meng Yuan continued: "Ma Youran and I investigated the school's surveillance. There is a surveillance camera at the entrance to the laboratory building. There are basically people in the building during the day. Even if the laboratory is not using instruments, there will be students during the day.

.

Therefore, our focus of investigation is after the students left the experimental building at night and before class the next day. At present, we can only confirm that the murderer did not enter through the main entrance.

I studied this experimental building and found that all the windows on the first floor have anti-theft windows and each floor is three meters high. There are two ways for the murderer to enter the laboratory."

The first is that the murderer is very skilled and climbs the security window on the first floor from the outside to enter the laboratory, provided that the laboratory window is open.

The second is that the murderer enters the laboratory building during the day, hides in places such as toilets, and waits until the students leave at night before entering the laboratory. The door of the laboratory is a fingerprint password lock, and the main board was damaged in the explosion, making it impossible to check the murderer.

Have you ever entered the laboratory by cracking the password?

After listening to Meng Yuan's clear analysis, Sun Yu nodded with satisfaction.

Just as he was about to speak, Meng Yuan added, "I prefer the second option. We are currently screening outsiders who entered the laboratory building during the day in the past three days. The focus is on those who did not leave the laboratory building on the same day after entering, or even the second day.

There are days that leave records but do not enter records.

However, the laboratory has a large flow of outsiders, and there are people delivering goods to various laboratories every day, so the workload is very heavy and it takes a long time."

After saying that, Meng Yuan smiled at Sun Yu. Sun Yu had nothing to say this time and extended his thumb to Meng Yuan.

"The word outsider is a bit harsh." Xia Lan raised a question.

Meng Yuan explained: "We are considering whether the murderer may be someone in the laboratory. Through the death list, it has been determined that the students in Laboratory 206 were present when the explosion occurred today, as well as their instructors. No one was spared. I don't think the murderer was

I went to great lengths to create an explosion just to die together with my classmates and teachers.”

Xia Lan looked at Wang Lan again. Wang Lan now looked sick and haggard, which made people feel distressed just looking at her.

Wang Lan said: "I haven't contacted Guo Xian here yet. Another student who sued Professor Ming is named Li Zekun. He has been contacted. He is now delivering food in Mengshan City. He lives alone and lives not far from the University of Technology.

In a village within a city not far away.”

"Several other students should also investigate. They all know about the problem with the heating plate and are all suspicious." Xia Lan felt that Wang Lan should not ignore such a simple question. If it was normal, she would definitely reprimand her, but now she can only

A friendly reminder.

Xia Lan glanced at Xiang Fei again, "You are so free, so accompany Wang Lan to check on those students!"

Xiang Fei nodded understandingly.

Xia Lan glanced around and her eyes naturally fell on Sun Yu, "Come with me to visit this Li Zekun?"

After the meeting, Xia Lan and Sun Yu drove away from the special case team.

Sun Yu leaned on the passenger seat with a cigarette in his mouth, "I can't figure it out!"

"What?" Xia Lan drove seriously without looking away from the front.

Sun Yu said: "If the murderer is a student of Mingbo and he wants to take revenge on Mingbo, why would he start an experiment that has nothing to do with him?"

There were six graduate students in Experiment 206 that exploded. Their instructor was not Mingbo, but an associate professor named Zhao Peng. The six students and Professor Zhao Peng were present when the incident occurred, and they all died on the spot.

Sun Yu checked Mingbo. Mingbo is now the dean. He also has graduate students under him and has his own laboratory. The laboratory also has the same type of instruments.

Akihiro is busy with official duties and rarely goes to the laboratory. There is almost no chance of killing him in the laboratory.

But even so, if Sun Yu is the murderer, he will definitely choose the laboratory of Mingbo students, which can satisfy a little bit of revenge!

"Isn't this untargeted?" Xia Lan asked puzzledly, "The murderer wants to use this to reduce his suspicion. Is this a normal approach?"

"But he didn't lower it!" Sun Yu shook his head in confusion, "Mingbo could tell at a glance that the explosion might be caused by a problem with the heating plate, so he naturally contacted Guo Xian and Li Zekun. If the murderer was among them, what do you think about this disguise?

Was it successful?"

Xia Lan was persuaded by Sun Yu, and she nodded repeatedly, "That's right! To say the least, if the murderer really wanted to take revenge on Mingbo, wouldn't it be enough to just attack Mingbo directly? He dared to blow up so many people, why didn't he dare to directly attack him?

What about killing Mingbo? And now we all know that the murderer wants to target Mingbo, and there are people on the criminal police team to help protect him. The murderer has lost the best opportunity to kill Mingbo."

As he spoke, Xia Lan suddenly turned his head to look at Sun Yu, "Let's make a bold guess, could the murderer be Mingbo, who calls "catch the thief?"

Sun Yu moved Xia Lan's head with his fingers, asking her to continue looking forward, and said angrily: "Dear Team Leader Xia, my ideas are all based on factual clues. If you want to imitate, please be more reliable.

a little."

In the blink of an eye, Xia Lan's car had already got off the viaduct and arrived at Peking University Town.

The urban village where Li Zekun lives is called Liuzhuang. It is located in the northeast corner of the university town and has a large area.

Just as Xia Lan's car drove into Liuzhuang, a loud noise suddenly came from the sky.
Chapter completed!