Detective: Open your eyes, I am handcuffed in the interrogation room.

Chapter 554: DNA of Four People
five minutes later.

Several police cars quickly drove out of the city police station gate, sirens blaring and police lights flashing, attracting the attention of all pedestrians along the way. It was obvious from the scene that something big had happened.

After Lu Yongqiang hung up the phone, Kou Chaoyi, who was still at the Municipal Bureau, was taken into criminal detention on the spot, awaiting further investigation.

As for Guan Xinmei, she was temporarily handed over to Jiang Xiaoxin.

Chen Yi has contacted a psychologist and is preparing to conduct a comprehensive psychological assessment on Guan Xinmei to find out whether there is any problem with her mental state.

If she really does have Stockholm syndrome, then the confession will be very important.

The entire forensic team was dispatched, and Zhuo Yun and He Shixin also received a notice. Other police officers who had cases on hand were to suspend their work as long as the cases were not urgent, and their target was Qingshi Middle School.

Such a large amount of blood has risen to the level of a major criminal case. It is hard to imagine what happened in Kou Chaoyi's office.

Also, what happened in Guan Xinmei’s dormitory.

Furthermore, where did Du Xun go? Did Guan Xinmei's mother really leave without saying goodbye? With the appearance of huge amounts of blood, the lives and deaths of these two people are in question.

There is no unless and no good news. The bloodstains exist, and the dead are either them or someone else.

Injuried?

Be it the technical detective or Chen Yi, facing such a bloody scene, they really couldn't comfort themselves and strive for the extremely low probability of luck.

The most likely possibility is that someone died, and the death was a tragic one, a most primitive and violent killing, so there was so much blood.

It was very quiet inside the police car and everyone had a serious look on their face.

No one would have thought that the investigation would lead to something big, including Chen Yi.

"Thank goodness I went to the Internet cafe."

Chen Yi felt somewhat fortunate.

If he had not gone to the Internet cafe with his friends all night, he would not have met Du Xun, nor would he have gone to Qingshi, and he would not have discovered the bloodstains in the dormitory and office.

There are quite a number of cases like this around the world: no one reports them, no one investigates them, and they completely disappear in the long river of time.

The police are passively involved in cases and rarely make discoveries on their own initiative.

The law of nature is clear and retribution will come. If you do evil, you must be prepared to bear the consequences when your crimes are exposed.

……

Qingshi has arrived.

"The entire school is sealed off from outside. From now on, no one outside the school can enter, and no one inside the school can leave."

Chen Yi gave the order and led his men into the campus.

The security guard who was not fired had already opened the door when he saw the police car. He was standing there at the moment, looking dazedly at the large number of police officers passing by.

what happened?
Isn't it all over now? The Education Bureau has rectified the situation.

His head was full of question marks, but he didn't dare to ask.

When they arrived at the principal's office, Lu Yongqiang was doing an investigation. Seeing Chen Yi arriving, he quickly told him the whole process of discovering the bloodstains.

I thought it was just a normal search, but I didn't expect to find some bloodstains.

I thought it was just a small amount of blood, but it ended up covering the entire room.

The fluorescence produced by the reagent reaction had disappeared and had no visual impact, but Lu Yongqiang's description on the phone was enough to make the later police officers imagine that when they walked into the room at this moment, they had the illusion that the temperature had dropped and their hair stood on end.

This is no longer an ordinary room, but a bloody crime scene.

Without Chen Yi's instructions, the forensic doctor quickly joined the investigation team and worked with the trace investigator to search for and extract all traces, both visible and invisible.

DNA is extremely stable, and even if it is partially cleaned or degraded, it will not affect the identification results unless the suspect has used specific chemical reagents.

Chen Yi raised his head and looked upwards, asking the trace inspectors not to forget the ceiling, and to wipe and bring back for inspection wherever the eyes could see.

DNA is different from other biological tissues. It is invisible, so we can only guess. If the trace test suggests it is present, then we will wipe it and take it back to the laboratory for testing, which is a test of our level.

The nature of this case is special, and the standard given by Chen Yi is a carpet-style investigation, which means that no corner can be left out.

Normally, it is impossible to do such a detailed investigation of a murder case that happened indoors. It is not that it is impossible, but that it is unnecessary. The workload is too large, and the load on the laboratory must also be considered.

They will only try if they can be sure that the case can be closed by finding DNA from someone other than the victim, which is a relatively rare situation.

Chen Yi looked for a while and walked out of the room.

"Old He."

"You said."

“I have a task for you, Qingshi’s student status and the new teacher.

Go and retrieve all the student records and teacher information from previous years at Qingshi, and check each one to determine their current status. Don't worry about whether they are injured or not, just keep them alive."

When Xin understood what Chen Yi meant, he began to suspect that someone had died in the school.

"Okay, I'll go right away."

The task was heavy, so he took everyone away except Qin Fei, and he might need to draw police forces from the nearby police station.

Although Qingshi has not many students, the total number over the years should be several thousand. If one phone call is made per minute, it would take nearly a hundred hours to check them all, not to mention the time spent getting the phone calls.

"Captain Chen, have we underestimated Kou Chaoyi?"

Qin Fei said at the door of the room.

A large amount of blood was found in Kou Chaoyi's office, and it was almost certain that he had committed a serious crime. However, this was not apparent in the previous contacts, and the impression given was that he was just a lustful and obscene old man.

I opened a school to make some money, and the management of the school was handed over to the student union. I flirted with girls when I had nothing to do. It was simply a godly life.

Before the bloodstains were discovered, no one would have thought that this old man could be so dark and dangerous inside.

Chen Yi came to the corridor window, took out a cigarette, lit it, and said, "We haven't seen enough criminals who are good at disguise."

Qin Fei nodded: "That's right, some people have great acting skills, and it would be a waste of talent if they don't become actors.

Captain Chen, do you want to go and interrogate the principal and other teachers?"

The school director has been fired by Kou Chaoyi. He might know something about the inside story and at least notice that something is wrong, right?
Chen Yi slowly exhaled a puff of smoke and said, "Go find Kang Qin."

"Kang Qin?" It took Qin Fei three seconds to retrieve his memory. "Okay, is that all?"

Chen Yi: "Yes."

Kang Qin is the president of the Student Union. For many years, Qingshi’s rules have been controlled by the Student Union, and Qingshi’s discipline has also been regulated by the Student Union. Teachers have to stand aside in this matter.

Need to ask.

Qin Fei: "I'll go right away."

He came back quickly, and Kang Qin followed behind him. There was a hint of doubt in her calm face, and she kept looking around.

"Captain Chen, the people have arrived."

Chen Yi turned his head, Kang Qin also looked over, and the two looked at each other.

"My last name is Chen." He introduced himself first, and then asked, "You have been in Qingshi for five years, right?"

Kang Qin nodded: "Yes, I came on the first day of the new year."

Chen Yi: "In a place like Qingshi, you, a girl, can become the president of the student union. To be honest, I'm quite surprised. It's amazing."

What kind of students are there in Qingshili?
They smoke, surf the Internet, fight, and some even secretly get tattoos on their bodies.

Not afraid of the sky, not afraid of the earth.

We cannot say that every student is bad, but relatively speaking, most students have relatively big problems.

It was in this kind of group and in this kind of environment that Kang Qin, a girl, crushed everyone and took the position of student union president. Even Chen Yi was a little impressed by her and thought she was quite capable.

You can tell from her temperament that Kang Qin is very precocious and can communicate just like an adult.

Facing Chen Yi's praise, Kang Qin smiled and said, "It's nothing, they are all stupid. Force can't solve the problem, we need to rely on brains."

"Hmm?" Chen Yi was surprised. It felt strange to hear this sentence coming from a student. "You are right. You do need brains. I have a few questions to ask. I hope you can answer them truthfully."

Kang Qin: "You say."

Chen Yi: "During these five years, has anything major happened in the school, such as someone getting injured, someone missing, an ambulance coming, etc." Kang Qin thought about it and shook her head: "No."

Chen Yi: "Are there any students who dropped out of school?"

Kang Qin: "Yes, but not much."

Chen Yi: "What do you think of the principal?"

Kang Qin: "I haven't seen it many times, so I can't comment on it."

Chen Yi: "Is there a problem between him and Guan Xinmei?"

Kang Qin shook her head: "No."

Chen Yi narrowed his eyes slightly, took a step forward and stared at Kang Qin.

Kang Qin was not prepared and stepped back subconsciously: "What's wrong?"

Chen Yi: "You and Guan Xinmei are not in the same class at all, and you have nothing to do with each other, but it seems like you know her very well?"

Kang Qin was slightly stunned and said, "I'm not familiar with her. She lives in a single dormitory. No one in the school dares to mess with her. The principal takes good care of her. I'm just familiar with her name."

Chen Yi asked back: "Since the principal is so caring towards her, it means there is something wrong. Why did you deny it just now?"

Kang Qin: "I didn't deny it. I just said I don't know."

Chen Yi: "You said no, it's not that I don't know. We have audio and video recordings of the whole process. Do I need to play it back for you?"

Kang Qin's tone choked, and she said helplessly: "Uncle police, can we not be pedantic? What's the difference between [no] and [don't know]? Let me change it now. I don't know if there is any problem between him and Guan Xinmei."

The girl lied.

Students are students after all. No matter how mature they are, they are still students. It is impossible for them to be completely foolproof when facing the police.

If she really doesn't know, she can just answer "I don't know", but answering "no" means she knows.

Is it there or not?

Change the answer to indicate yes.

She knew there was a problem but she denied it.

"Student Kang Qin," Chen Yi said, "Your principal Kou Chaoyi has been arrested and will spend a long time in prison. If you have anything to say, just tell the police. They will help you."

Kang Qin's situation may be the same as Guan Xinmei's, but her appearance is not very good and she is rather ordinary.

Does Kou Chaoyi choose his targets based on their appearance? Not necessarily.

There is something special about Kang Qin that is hard to come by in school. This is also a kind of charm, at least she is very lethal to her peers.

Think about it, when we were young, didn't we all admire the mature girls in our class? Even more so than their looks.

Missing out on the naivety of life is a regret after adulthood, but I was completely unaware of it back then.

Being naive and innocent is an advantage when you grow up, but it is a disadvantage when you are a child.

"It's okay. I've never been bullied at school. They can't bully me." Kang Qin was very confident.

Chen Yi believed this.

If he could be bullied at will, how could he have become the student union president?

Kang Qin left.

I didn't ask anything, but there is a high probability that I know something and chose to lie.

The more we investigate, the more clues we find, but they don't help much in advancing the case.

The next step is to wait for the on-site investigation to be completed and then return to the Municipal Bureau to interrogate Kou Chaoyi and ask him about the bloodstains in his office.

It was his own office, and he couldn't hide this time.

The workload is quite large, lasting from day to night, and from night to early morning. During this period, samples are constantly sent back to the Municipal Bureau laboratory for testing, and the results are already beginning to emerge.

A complete DNA extraction of a person.

Over time, the second person's DNA was extracted intact.

The next afternoon, the third person's DNA was completely extracted.

There was no fourth different DNA present.

three people.

In Kou Chaoyi's office, the blood of three people was shed. The scene was tragic and their lives and deaths were unknown.

Including Guan Xinmei’s dormitory, there are four in total.

This is a very scary number.

"Do DNA paternity tests separately to see if Guan Xinmei's mother is among them." At the Municipal Bureau, Chen Yi gave the order before interrogating Kou Chaoyi, "Also, extract the DNA of Du Xun's father and continue the DNA paternity test."

After saying two words, he entered the interrogation room.

Kou Chaoyi was already handcuffed and was sitting quietly on a chair. Chen Yi walked in without letting him look up.

Now it's the preliminary hearing.

The source of the bloodstain is unknown, the identity of the owner of the bloodstain is unknown, and whether the owner of the bloodstain is dead or alive is unknown. It is actually very difficult to get a confession from him.

However, the bloodstains are there and Kou Chaoyi cannot deny it.

Everyone hopes that this is just a case of intentional injury.

Just stay alive.

Chen Yi stood in front of Kou Chaoyi.

"Keep your head up."

Kou Chaoyi slowly raised his head.

Chen Yi: "Let's get straight to the point. Whose blood is in your office and where did it come from?"

Kou Chaoyi didn't seem surprised. He lowered his head expressionlessly and replied, "I don't know."

"Keep your head up."

Kou Chaoyi didn't move.

Chen Yi stretched out his hand and grabbed his hair, pulling it up forcefully, then leaned in and stared into his eyes: "Three people's blood was found in your office, and you didn't tell me that?"

Looking at Chen Yi who was so close, Kou Chaoyi rolled his throat hard and repeated, "I really don't know."

Chen Yi let go of his hand, and Kou Chaoyi's head drooped.

It looks like this will be a protracted trial.

Three hours later.

Municipal Bureau Laboratory.

The inspector picked up the last printed paper, confirmed that all the information was correct, opened the door, walked out of the room and went to the interrogation room.

At this moment, Chen Yi was still in the interrogation room.

He was very patient and talked with Kou Chaoyi for three hours, but the other party only had three words to say: I don't know.

The police only found bloodstains and they don't even know the whole situation, so it's far from being enough to convict someone. Anyone with a strong mental state would not choose to confess at this time.

There was a knock on the door. The police officer walked in and handed the comparison results to Chen Yi.

"Team Chen."

Chen Yi sat at the interrogation table with his chin in his hand. Kou Chaoyi in front of him looked a little listless. Everyone was very tired.

"Just tell me the result." He didn't look at it.

The police officer bent down and whispered: "There are three people's bloodstains. One of them belongs to Guan Xinmei's mother, another belongs to Du Xun, and the third one is unknown."

Chen Yi's gaze suddenly became sharp.

(End of this chapter)