The Clear River Academy faces three streets and one side faces the water.

As a result, students have opened multiple doors on the three sides, with the larger ones being about one and a half meters high, allowing people to bend over and pass through. The medium-sized ones require squatting to squeeze through, and there are even smaller ones that can only be used to deliver takeout.

Looking at the marks where the red walls have been dug out, each hole looks like it's growing.

It can be imagined that if every student who drills a hole makes an effort to touch it, the hole will expand to the size of a normal door.

Every once in a while, Clear River Academy will also crack down on the behavior of students opening holes in the high walls. The discovered holes will be simply filled in, and the surrounding area will be reinforced to prevent students from opening dangerous holes again after a period of time.

The principal's secretary sent the surveillance video from the opposite small restaurant to the criminal police.

When opened, the camera was directly facing the hole, capturing the faces of everyone coming in and out.

"Do the students know about this camera?" Jiang Yuan had only recently graduated from school and could keenly feel the deterrent power of the video.

"Those who want to know will find out," the principal smiled smugly. "In your words, the main purpose of this camera is for investigation, not for evidence."

Using it as evidence can only be done once, but for investigation, it can be used countless times.

Students who sneak out of the door usually don't try to avoid the camera, and even if they want to, they can't. Therefore, as long as it can be confirmed that this incident exists, there are plenty of cameras in the school used as evidence.

Jiang Yuan looked the principal up and down, a man with a square face who looked very upright. Unexpectedly... he was a bit shifty and sinister, with his left nostril smaller than his right.

"Is it useful?" the principal asked with concern, watching the criminal police's actions as if he wanted to learn from them.

His actions at this time were similar to those of the students under Zeng Zhuohu's command.

But this time, the actions of the criminal police were easy for him to understand. Principal Heng Wenxuan also had the look of someone who had learned something.

In fact, there was nothing to learn. The criminal police here were using the most basic functions.

Jiang Yuan looked at Zeng Zhuohu's students and inexplicably felt a slight sympathy for them.

The principal probably had no shortage of daily thoughts.

The criminal police team searched one group of cameras after another, and by the time they found the thieves, they had already found five holes.

Jiang Yuan was getting a little bored of watching, thinking to himself: it would be better to just open a few more doors.

In the video, it was clear to see two thieves bending over and crawling out of the hole, then handing over a suitcase. A passing student even lent a hand.

But when the camera was fixed, it could be seen that the two thieves not only wore masks and sunglasses, but also had the lower half of their faces covered with sun-protective clothing, with almost no skin showing.

The criminal police watching the surveillance footage were both angry and amused. "What are students thinking these days? No one called the police even when they're dressed like this?"

Jiang Yuan felt that what he said was not right, but when he looked at the faces of the two thieves, he felt that what he said made sense.

"By the way, if there's a monkey in the suitcase, wouldn't it make noise?" Jiang Yuan asked Zeng Zhuohu.

"It should make noise," Zeng Zhuohu shook his head.

Jiang Yuan nodded, guessing that they might have used something, but he didn't say it out loud.

"Go and collect fingerprints." Jiang Yuan pointed to the top of the hole in the video image.

The girl carrying the suitcase had to touch the wall when she came out of the hole because she had to lift the suitcase, and she wasn't wearing gloves.

On such a hot day, covering your face can be called sun protection, but wearing gloves would be too uncomfortable.

However, the two of them were probably wearing gloves when they stole the monkey, and only took them off after coming out. They probably didn't expect to be noticed in a place more than ten minutes away from the Animal Protection Building.

Thieves who are exposed like this are not few in number.

An outsider might think, if it were me committing the crime, I would definitely wrap myself up tightly, not even taking it off at the door.

In reality, this is very difficult to achieve, because outsiders only think about it, and have never actually done it - this is where the professionalism of professional criminals can be seen. When they commit a crime, they usually practice.

For the two small thieves who stole the monkey, the reason they didn't wear gloves all the time was probably not because they didn't think of it, but more likely because they couldn't do it.

For example, dragging a suitcase, wearing gloves, walking in the scorching sun for more than ten minutes, they would probably get tired, their hands would slip, and they wouldn't be able to move the suitcase.

At this point, would they take a break on the side of the road with gloves on, or take off the gloves, wipe off the sweat, and continue walking?

Or, when they were walking on the road, they might need to make a phone call, use their phone, and wearing gloves would be inconvenient.Additionally, during the process of boxing up the monkeys, is it necessary to remove gloves? Feeding the monkeys or administering injections might also require such measures.

In summary, criminal activities are both mental and physical endeavors. In practice, it's inevitable to encounter unexpected problems and difficulties.

If one can perfectly overcome these challenges without any prior rehearsal, it would require a considerable level of expertise.

If a rookie could achieve this, they are actually better suited to be a secret agent.

As a forensic expert, I never believe in perfect crimes.

Even ordinary police officers don't believe in them. Everyone is more convinced that increased investment leads to greater output.

From the perspective of ordinary police, someone like Jiang Yuan is also considered an investment.

...

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A large group of people arrived at the entrance of the cave, where Jiang Yuan personally lifted the fingerprints.

It must be said that these fingerprints were not easy to extract.

Firstly, the location was difficult to determine, and secondly, there were overlapping fingerprints from multiple people, which required some professional technique to process.

Jiang Yuan's method was to first determine the position of the bricks, then photograph the entire brick, label it, and then directly remove it to be sent to the laboratory for extraction.

This was also because the case did not belong to Ningtai County Bureau, but was handed over to the Qinghe City Bureau's laboratory, which made it easier to store a copy of the evidence later.

After completing these tasks, Jiang Yuan leisurely returned to Zeng Zhuohu's office to continue helping him with video editing.

The students admired him greatly, studying imaging technology even more diligently while serving Jiang Yuan tea and water, attending to him hand and foot.

Later in the evening, a few more young girls poured into the office.

Zeng Zhuohu turned a blind eye, as he had no grounds to object, and just watched from the side, trying to maintain control.

To the girls, the tall and imposing Jiang Yuan might only score 80 in looks, but with today's halo effect, he seemed different.

"Forensic Jiang, you took the bricks to extract fingerprints from them, right?" the girls asked as they watched Jiang Yuan enter some incomprehensible commands into the computer, inquiring about today's news event.

Jiang Yuan hummed in affirmation, saying, "That's roughly the idea."

The girl who asked the question was slender and flat-chested, with a sharp chin and the makings of an internet celebrity face. She had applied a nice makeup, looking quite pretty, and asked in a sweet voice, "After extracting the fingerprints, will you know who it is?"

"If we extract them, we'll do a comparison."

"What does comparison mean?"

"It means comparing them with the fingerprints in the database."

"Fingerprint database? So if they're not in the database, you can't compare them, right?"

"Correct." Jiang Yuan answered while turning to look at the girl who had asked the question.

Several people had asked similar questions today, but she was the first to ask in such detail.

At this moment, a girl from the student council boasted, "If it's a student from our school, they won't be able to escape."

"Why is that?" the internet celebrity-faced girl asked curiously.

The student council girl sneered, glancing at her and said, "Don't you have to check in with your fingerprint when you run in the morning? Your fingerprint is stored in the check-in system."

The internet celebrity-faced girl was taken aback, her complexion changing.

This reaction was a bit beyond normal, and Jiang Yuan couldn't help but lower his head to look at the girl's feet.

After a glance, Jiang Yuan silently took out his phone and sent a message to the detective leading the team this time.

"I need to go," said the girl, perhaps noticing Jiang Yuan's actions, and she turned and left the room.

Jiang Yuan didn't budge an inch.

At this point, Zeng Zhuohu also sensed something was amiss and hurriedly said, "Aren't you going to stop her?"

"No need, she won't get far," Jiang Yuan replied and immediately made a phone call.

It's too dangerous for a single officer to apprehend a suspect; the team doesn't allow it.