When Yu Fei came, he brought over the three stones, which were considered as one of the physical evidences. Ding Taotao also had the surveillance camera in his hands and showed it to the police.

Yu Fei's inference and analysis ability was even recognized by the police, because some ordinary police officers are often not as strong as Yu Fei's analysis ability.

They thoroughly adopted Yu Fei's suggestions. According to the results of Yu Fei's analysis, they quickly eliminated many teachers and quickly narrowed the scope of suspects to only five or six people.

In the end, Yu Fei felt that the nail was a clue, but he didn't know which part of him was wrong, and his sense of smell was hard to explain. Yu Fei kept strengthening the clue of the nail and told the police that the nail was definitely a clue.

Then Yu Fei changed his expression, saying that when he observed the nails at close range, he smelled a special smell on them, and then when he entered the school building, he also smelled the smell in other places.

Yu Fei's expression made the police feel the need to take a look, and then asked Ding Taotao some questions, which were similar to what Yu Fei asked. They mainly considered using the surveillance here to see if they could find out the person who came here to get nails.

However, they asked the same questions as Yu Fei and got the same answers. In the end, they found that this clue could not be investigated. Many teachers had been to this building recently, and there was no targeted surveillance installed here, so in the past few days,

Everyone who entered the building seemed to be suspicious.

Yu Fei and a group of police officers stood at the corner of the corridor, staring at the utility room that Yu Fei kicked open. It was cluttered with countless things stacked inside. Because it was in the corner and had not been opened all year round,

The musty smell was very strong and there were all kinds of things inside.

So it is quite normal for people to find nails from inside. Everyone thinks that the nails are a clue, but this clue seems to be difficult to use. Everyone is brainstorming to see if they can dig out valuable information.

"I have an idea!"

An old policeman suddenly spoke.

Everyone quickly looked at the old policeman, waiting for his next words.

"The result of our previous inference is that the perpetrator is a woman or a teacher. In fact, he is just an ordinary person!"

"The locked range is very small. Now we can delve deeper into the opponent's purpose of using this nail!"

"Most people commit crimes on a whim and don't have a long-term or complete plan!"

"So the other party was still using stones to hit the car yesterday, so it means that she may have been confused after smashing the car, and then started to think about it when she got back. Next time, she wanted to change the method, and then she thought of placing nails on the road!"

"Since she came up with the idea out of nowhere, did she think about the origin of the nail and then remember that she had seen nails before moving things here, so she came here to take the nails back?"

"If this is the case, this time period will be shortened a lot. It was probably after everyone had finished their work yesterday and had a rest. The other party will definitely avoid picking it up when there are many people!"

"We will look at the surveillance and study this later!"

"There is another possibility, that is, she took the nails back in advance. She had this nail before, but as Mr. Liu Chuanwen said, this nail is more suitable for repairing tables, chairs and benches. She plans to find someone to help her repair it!"

"Then it's hard to tell when the nail was taken, but since she wants to hire someone to repair the tables, chairs and benches, there's a good chance it'll be a man, and she's already said it!"

"We can ask the male teachers, or go to their residences or offices to see if any of these suspects have damaged tables, chairs and benches and need to use nails to repair them, so we can narrow down the scope!"

The veteran policeman used rigorous thinking to handle this matter

Various possibilities, mixed with changes in the timeline, were analyzed.

When these words were said, many people showed expressions of admiration, because originally there was no progress and they felt that the clues were useless, but the other party suddenly analyzed them and found out the value!

"You're right! Let's check the surveillance first. From yesterday afternoon to today, the tires of vehicles have been punctured, and see if we can find any suspicious persons!"

A young policeman was deeply inspired. Although he didn't think of a way, he could execute it well.

"Yesterday, everything was tidied up in the teaching building. Since then, no one has been coming to the teaching building. If the other party came to pick up nails after throwing stones yesterday, then not many people have entered this building. Plus,

If you eliminate other conditions, you can easily analyze who it is!"

Ding Taotao hurriedly provided some information again.

Suddenly everyone became more confident, feeling that if the old police officer's first guess was true, he might be able to find the real culprit.

Everyone hurriedly walked to the school's monitoring room, turned on the monitoring in the teaching building, adjusted the progress to after yesterday afternoon, and turned on double-speed viewing. A group of people stared at the computer screen.

Sure enough, after being busy during the day yesterday, there were very few people coming in the afternoon. Even though I was driving at double speed, there was not a single person in the surveillance camera for a long time.

Finally, we arrived at the first figure, a man. He went up to the third floor, walked into the office, picked up a folder, and left. He went up and down the stairs very quickly.

Yu Fei and the others had already targeted women, so they didn't pay too much attention to this man. In fact, there was nothing suspicious about this man.

A female teacher soon came and went upstairs to the office to get something. However, Ding Taotao said that this female teacher was basically impossible and that the previous conditions could be eliminated. This female teacher was also transferred from the village school and had a big child and a family.

She is also very happy, she is a sunny and cheerful elder sister, and there is no way she would do such a despicable thing.

Finally, a female teacher came who they had not ruled out, but this female teacher did not enter the corridor at all, because she rushed to the teachers on the first floor, moved a stool for herself and went back to the dormitory.

After the surveillance went to night, no one came at all. When everyone was looking bored, suddenly a sneaky figure came out of the darkness. He turned around and looked around while walking. The guilty look made

The policemen suddenly became interested, and their eyes widened.

"That's wrong! How can this be a man!"

"That's right! The light is reflected on his forehead, what is he doing here?"

"Why did he go straight to the toilet!"

…

A group of police officers discussed it eagerly. They thought this was a new case that had been discovered. They even suspected that this person was a thief. However, the thief went from floor to floor to the toilet for a long time in the middle of the night. They couldn't understand it. This guy stole shit.

come yet?

Yu Fei and Ding Taotao suppressed their laughter because they recognized that this was Lu Feng. Lu Feng went upstairs to clean the toilet after avoiding other teachers.

"Ahem, you may have misunderstood. This person actually made a bet with me before. If he lost, he would have to clean the toilet for five consecutive days. He was embarrassed, so he came to clean it in the middle of the night!"

Yu Fei quickly explained to the police officers to prevent them from thinking too much, wasting their brains, and getting distracted.

After hearing this, the policemen looked at Yu Fei speechlessly. This guy made a bet with someone, which really made people speechless.

However, when Yu Fei explained this, they suddenly realized that since it was cleaning the toilet, it was quite reasonable, and they could understand if it was still embarrassing.

So they continued to fast forward the camera until after dawn, then adjusted the speed to a reasonable speed.

Keep checking.

Ding Taotao said that the work here was over, and it was true that few people entered. Everyone kept watching the surveillance camera and saw that at noon, a total of four people entered the building, two men and two women. These two men can be ruled out as suspects.

A woman eliminates one person, and the remaining person is a suspect who has not been ruled out before.

However, after everyone played and watched several surveillance cameras together, they basically ruled out the suspicion that this person was picking up nails during this time period, because after calculating the speed of her going downstairs, it was found that she did not have time to go to the utility room to pick up nails.

The time for monitoring the blind spot is very reasonable. Even running while monitoring the blind spot seems to be difficult for a woman to do with her physical strength.

In the end, no one appeared on the surveillance camera. It was time for Ding Taotao's tire to be punctured, and everyone finally stopped checking the surveillance camera.

This shows that the old policeman's analysis was correct. The woman may have suddenly come up with an idea, but she may have prepared nails early. The possibility of preparing nails was to repair tables, chairs and benches, and then she thought of using nails to prank Ding Taotao.

idea, so I used this nail.

Then you can only perform the second guess, asking anyone who has heard of a female teacher whose desk, chair, and bench is broken and plans to repair it, or whether a female teacher has asked a male teacher to help repair the desk, chair, and bench. Of course, no

Even if there are women who are capable, please ask.

Except for the teacher who accompanied the injured person to the hospital, other teachers were quickly summoned, and then the men and women were separated and began to inquire individually.

The inquiry is very efficient because there are very few questions to ask and the teachers are generally very cooperative.

We even allocated manpower to call the teachers in the hospital and inquire with them individually.

However, after all this questioning, there was still no clue. No one said that they had heard that someone's desk, chair or bench was broken and they planned to repair it, and no male teacher was asked by a female teacher to do this.

Finally, they discovered a problem. These teachers still have some privileges in the school. If the desks and chairs are broken, they can directly ask for them to be replaced. There is no need to repair them at all. Even if they are repaired, the school will take them back and find someone to repair them.

The matter suddenly reached a deadlock again, the clues to the nail were broken again, and the veteran policeman's wonderful analysis turned out to be fruitless.

This shocked everyone. Such a simple case could not be solved even after brainstorming. It really made them doubt their lives.

Letting other teachers leave their doubts, Yu Fei and the others sat in the conference room with the police, and they all fell silent. Their brains kept recalling the whole incident and looking for clues.

Yu Fei was bored, so he stood up and planned to move around to see if he could find any clues.

After walking not far, he suddenly found a very special classroom, or art room!

It seems that this is a classroom specially opened for learning. It is full of painting supplies and there is a small corner, which is a photography corner, where a large number of photos are displayed.

The reason why Yu Fei noticed this place was because he found that there were many places where nails were used!

The door was locked, but the anti-theft lock on the window was broken, so Yu Fei opened the window and entered.

In this teacher, the nails are mainly used on the wall, because after the nails are driven into the wall, the rope can be fixed on it, and then the students' works can be hung on the rope. The same is true for the photography area, where many ropes are fixed on the rope.

Some of the photos taken were of small animals, and some were of landscapes.

It stands to reason that after students are on vacation, it is useless to lock them. After the new semester starts, they can just open the doors and clean them.
Chapter completed!