Panda Criminal Investigation Team

There is also a brochure next to the dangerous goods counter,

It is a record of the use of dangerous goods,

But there's even less in this brochure,

Because there are sulfides in the cabinet,

Students are afraid of smell,

Every time someone opens the locker,

The surrounding students all fled outwards,

Tell the person who opened the cabinet to close the door quickly.If things go on like this, no one will take records seriously.

When Cheng Bin was flipping through the record book, the dean's face turned livid,

After a while he voluntarily admitted his mistake: "Our hospital's management is not good. In fact, the regulations are not like this. We should write a good record.

Locked at any time.I'll have a meeting with someone tomorrow,

Solve this matter. "

But that's it, the list of people who can get thallium sulfate from students who have access to the key to the dangerous goods cabinet,

It is relaxed to everyone who can enter and exit the laboratory of the chemical building at will.But Teacher Jiang said,

Except that the laboratory on the second floor is open to the public as a teaching venue for experimental chemistry courses,

The laboratories on the third floor and above are not open to the students of the outer courtyard.

Although there is no access control system or monitoring equipment on the floor,

But there are people operating experiments in the laboratory all the time,

When you meet strangers, you will definitely be suspicious.It's not that I'm afraid that someone will plagiarize the experimental design,

It is afraid that someone will operate indiscriminately, which may easily cause accidents.Last year, a student from the Department of Biology borrowed the chemistry building to do an experiment, but the teacher didn't notice it for a while.

She blew up half of the laboratory,

The pipes in the ceiling are still black.And that student's face had a big gash, and her face was disfigured at a young age, and no one could help her restore her appearance.Since then, the departments have strictly managed the laboratory, and no one from the outer courtyard is allowed to enter without permission.Even if there are occasional cooperative experiments or site borrowing between departments, the teachers or doctoral students of the department will watch the whole process, and they dare not relax at all.

"I'm not bragging. The quality of undergraduate experiments taught by our school is different from those outside! Every year, many people from other schools apply for graduate students in our department. Newcomers have to teach them how to do experiments from scratch, their safety awareness is so poor that even the most basic operations are not correct.”

Jiang Xuesong took them back to his office, and asked Xiao Xia to call some other students in his group for questioning.A total of five people came, three of them were girls and two were boys.

"Xia Yu, you have already met, he is a student of Bo Yi, who is in the direction of inorganic analysis. This is Yu Jiao, who is studying in the second graduate school, and is doing the subject of combining inorganic materials with materials. This tall one is Kong Hui, who is also in the second year of research. Recently, I am writing a report on biological applications. And this is a freshman who just joined this year, Yuan Xia..."

Among them, Xia Yu was responsible for the electrochemical experiment and needed to use thallium sulfate in the experiment, that is, the boy who sent them the weighing book, Xiao Xia.But Xia Yu said that it was not he himself who mainly performed the experiments, but his senior student, Xu Ruiwen.Because of his busy schedule, he outsourced the experimental part of his thesis to a junior student, and he was only responsible for the experimental design and data proofreading.Xu Ruiwen wants to continue his postgraduate studies in the group of teacher Jiang Xuesong in the future. He has been doing odd jobs in the group since his sophomore year, and now he has started to participate in key projects.So Xia Yu quickly called Xu Ruiwen and called him out of the dormitory.

Cheng Bin and Yu Renjie borrowed an office on the first floor and called these students in for questioning. Not long after, they made an astonishing discovery——Xu Ruiwen and Li Qianqian's roommate Yang Ying were in a boyfriend and girlfriend relationship.The students in the group reported that they often saw Yang Ying come to the laboratory to find Xu Ruiwen, and the two had a very close relationship.Sometimes Xu Ruiwen was doing experiments, and they invited Yang Ying to sit in their activity room.Although everyone knows to be wary of people from the outer courtyard, the boyfriend and girlfriend of one's own brothers and sisters are not counted in the circle of outsiders.

Xu Ruiwen arrived 10 minutes later. He was a tall, thin and fair boy with a very good appearance, but he inherited the sloppy habits of most men of science and engineering, and came with a pair of plastic slippers.Xiao Xia said a few words to him, he leaned back on a wooden chair in the office indifferently, leaned over and said, "It doesn't matter if you don't do experiments."

"Young people nowadays have stronger personalities," Teacher Jiang Xuesong said to Director Tian with a wry smile, and then told Xu Ruiwen the reason for the police's visit.As soon as Xu Ruiwen heard that a girl in the Management Institute was found to be poisoned by thallium, he straightened his body in an instant, raised his head and glanced at the faces of the crowd, then leaned back and lay on the back of the chair obliquely, just Limbs were still stiff, he asked lightly: "Oh, so what."

"What about it!" Xiao Xia excitedly pulled him up from the chair, and Xu Ruiwen's collar was pulled up to his chin: "Did you take thallium sulfate out to others when you were doing the experiment?"

Xu Ruiwen was stunned for a while with his mouth open, and finally said firmly: "No! I don't know Li Qianqian, so I hurt her only when she was sick! Yang Ying didn't do anything, she didn't understand chemistry at all, and I never Tell her what experiment I do, not to mention, she doesn't enter the laboratory at all."

At this time, all the teachers and students in the room were relieved, and even Xia Yu smiled, but Yu Jiao in the group exposed him: "You are lying! She obviously often comes into our laboratory, and sometimes flirts with you , chatting with us sometimes. At the end of last semester, she also came, chatted with me in the lab, and ate Pizza Hut with us."

The brothers and sisters around her wanted to cover her mouth, but it was too late. Yu Jiao's brain would not be bent, and her intestines went all the way: "What's wrong with saying it? I believe Yang Ying will say that! At worst, go check it out." Well, the result is the same anyway, even if Yang Ying is standing in front of me right now, I would say the same, but I haven’t done it anyway, so what are you afraid of!”

She really believed that the younger brother's girlfriend was innocent, but she really sold her out. Before she could react, Yu Renjie called her into the closed office alone, and praised her After the personality, a few additional questions were added.

In just ten minutes, Yu Jiao sold everyone out.She told them that the students in the courtyard often brought their boyfriends and girlfriends into the laboratory for a walk. For example, Kong Hui once brought his girlfriend from another school into the laboratory building on weekends, and accompanied him to do experiments for a whole day.My girlfriend didn't put on a lab coat or gloves, and just helped pour the reagents with her bare hands.

In addition, the amount of reagents used in the experiment was not properly recorded, and there were many cases of under-reporting and under-reporting. Anyway, there is money in the department, and they can be bought after use. Many students wash the flasks with acetone, and they are one bottle after washing... But these No one cared about it at all, so from the records of the hospital, it is impossible to see how much thallium sulfate was missing. It can neither prove that someone stole some, nor that it was not stolen. It is all a mess.

But Yu Jiao still firmly believed that the junior brother and his girlfriend were innocent. She said that even if the whole school could only find thallium sulfate in the Chemical Institute, it did not mean that the thallium element that poisoned Li Qianqian came from the laboratory.

"Thallium can be found in the whole city, the whole of China, and even the whole world. Anyone can poison that girl!"

Although her statement is far-fetched, it is not unreasonable.From a narrow point of view, the teachers and students who can hold the key to the dangerous goods cabinet are the main suspects, and Yang Ying, as the girlfriend of the experiment operator, makes her stand out as the only suspect in this case.

But from a broad point of view, anyone in any corner of the world, as long as they have access to thallium and are able to commit crimes during the period when Li Qianqian was poisoned, may become a criminal.

Therefore, a person cannot be regarded as a murderer just because he has the motivation and conditions to commit a crime, but he cannot easily let go of any suspect because of a broad perspective.At this time, the police must rely on evidence to make a judgment, including witness and physical evidence.

After leaving the chemistry building, it was evening again.

Cheng Bin hypocritically asked if he needed a car to take the two young men to the underground station. Hao Jinyang just nodded, but was dragged away by Xiao Mi: "The subway station is just a short walk away, don't bother the captain!"

After Hao Jinyang and Xiao Mi left, only Cheng Bin and Yu Renjie were left. They were strolling in the campus covered with green grass and dense ginkgo trees.The surrounding buildings are not tall and are brick red. At this moment, the setting sun is inlaid with a layer of gold, making the whole campus look warm and fluffy.Also fluffy is Yu Renjie's side face. Cheng Bin caught a glimpse of the tiny fluff on his face hiding behind the dark glasses. This Yu Renjie looks very soft and warm, which makes Cheng Bin can't help but want to say everything, To get his forgiveness.Such beautiful scenery gave him another illusion. If he confessed his feelings to him at this time, Yu Renjie might hug him gently.What kind of mood is this - wanting to walk with him in this ginkgo tree, and then go on like this, without end... probably this is the mood.

"That night..." Cheng Bin said slowly, he suddenly stopped, took a deep breath, and turned his head to look at the person he was thinking of.As he thought, Yu Renjie also looked at him, his eyes flickered and his lips parted slightly.

Cheng Bin thought of the absurd scene of the two of them ups and downs, of Yu Renjie's avoidance and indifference towards him in recent days, and also of Yu Renjie's childish appearance when the little fat man bullied him many years ago, spreading his hands to protect him behind him...His Adam's apple moved I moved, and finally said: "I ate your pancake that night, I'm so sorry!"

"Cake?" Yu Renjie opened his mouth, pointed at the crowd 200 meters ahead and said, "The egg-filled cake is there, let's go buy it!"