Chapter 554 DNA of Four People

Five minutes later.

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

After Lu Yongqiang hung up the phone, Kou Chaoyi, who was still in the city bureau, was taken into criminal detention on the spot and awaited follow-up investigation.

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

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

If she really had Stockholm syndrome, then the confession would be very important.

The entire forensic team was dispatched, and Zhuo Yun and He Shixin also received a notice. As long as the case was not urgent, all other police officers with cases on hand would be suspended, and the target was Qingshi Middle School.

With such a large amount of blood, the severity had risen to a major criminal case. It was hard to imagine what had happened in Kou Chaoyi's office.

Also, what had happened in Guan Xinmei's dormitory.

Furthermore, where did Du Xun go? Did Guan Xinmei's mother really leave without saying goodbye? The appearance of a huge amount of bloodstains puts the lives of these two people in question.

There is no unless, and there is no good news. The bloodstains exist. If they are not dead, then they are dead.

Injured?

Whether it is the technical detective or Chen Yi, facing such a bloody scene, it is really impossible to comfort themselves and strive for the extremely low probability of luck.

Someone died, which is the biggest possibility, and died miserably, the most primitive violent killing, so there is so much blood.

The police car was very quiet, and everyone had a serious face.

No one would have thought that they would find out something big during the investigation, including Chen Yi.

"It's a good thing that I went to the Internet cafe."

Chen Yi was somewhat fortunate.

If he hadn't gone to the Internet cafe with his friends all night, he wouldn't have seen Du Xun, nor would he have gone to Qingshi, and it would be even more impossible to find bloodstains in the dormitory and office.

A considerable number of cases around the world are like this, no one reports the case, no one investigates, and they completely disappear in the long river of time.

The police are passive in approaching cases, and rarely take the initiative to discover them.

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

…

Qingshi has arrived.

"The entire school is blocked from outside. From now on, people outside the school cannot enter, and people inside the school cannot leave."

Chen Yi gave an order and led people into the campus.

The security guard who was not expelled had already opened the door when he saw the police car. At this moment, he stood there, looking at a large number of police officers passing by in front of him with a dazed look.

What happened?

Isn't it over? The Education Bureau has rectified it.

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

When he came to the principal's office, Lu Yongqiang was doing an investigation. When he saw Chen Yi arrived, he quickly told him the whole process of discovering the bloodstains.

I thought it was just an ordinary search, but I didn't expect to find a little bloodstain.

I thought it was just a small amount of bloodstains, but it ended up spreading all over the room.

The fluorescence produced by the reagent reaction has disappeared, and there is no visual impact, but Lu Yongqiang's description on the phone is enough to make the later police officers imagine that they have an illusion of temperature drop when they walk into the room at this moment, and their hair stands 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 went with the trace inspection to find and extract all traces, including visible and invisible ones.

DNA is extremely stable, and even partial cleaning and degradation will not affect the identification results unless the suspect uses specific chemical reagents.

Chen Yi looked up and told the trace inspection not to forget the ceiling. As long as the eyes can see, they must wipe it and take it back for testing.

DNA is different from other biological tissues. It is invisible, so it can only be guessed. If the trace inspection thinks it is there, then wipe it and take it back to the laboratory for testing, which is a test of the level.

The nature of this case is special. 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 murder case indoors. It is not impossible, but it is unnecessary. The workload is too large, and the load of the laboratory must also be considered.

Unless it is certain that the case can be closed by finding DNA from someone other than the victim, they will try, which is rare.

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

"Lao He."

"You say."

"I have a task for you, the student records of Qingshi and the new teachers.

Go and retrieve all the student records and new teachers' information from previous years at Qingshi, and check their current conditions one by one. Don't worry about whether they are injured or not, just be alive."

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

"Okay, I'll go right away."

The task was heavy, he took everyone away except Qin Fei, and he might need to mobilize police from nearby police stations.

Although there are not many students in Qingshi, there are thousands of them all year round. If one phone call is made every minute, it will take nearly a hundred hours to check them all, not to mention the time it takes to get the phone.

"Captain Chen, did we underestimate 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.

Open a school to earn a little money, leave the management of the school to the student union, and flirt with girls when you have nothing to do. It's like a fairy life.

Before the blood stains were discovered, no one would have thought that this old guy's heart would be so dark and dangerous.

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 true. Some people are very good at acting. It would be a waste of talent not to become an actor.

Team Chen, do you want to review the school director and other teachers? "

The school director has been fired by Kou Chaoyi. He may know something inside, or at least notice something is wrong, right?

Chen Yi slowly exhaled a puff of smoke: "Go find Kang Qin."

"Kang Qin?" Qin Fei spent three seconds retrieving the memory, "Okay, shall we call here?"

Chen Yi: "Yes."

Kang Qin is the president of the student union. For many years, the rules of Qingshi have been controlled by the student union, and the discipline of Qingshi has also been controlled by the student union. In this matter, teachers have to step aside.

Need to ask.

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

He came back very quickly, and Kang Qin followed behind him, with a trace of doubt in his calm face, and kept looking around.

"Team Chen, we're here."

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

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

Kang Qin nodded: "Yes, I'm in the first year of junior high school."

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

What kind of students are there in Qingshili?

Smoking, surfing the Internet, fighting, and some secretly getting tattoos on their bodies.

Don't be afraid of the sky, don't be afraid of the earth.

It cannot be said that every student is not good, but most students still have considerable problems.

It was in this kind of group, in this kind of environment, that a girl from Kangqin overcame everyone and took the position of president of the student union. Even Chen Yi was a little impressed by her ability.

You can tell by looking at his temperament that Kang Qin is very precocious, and his communication is no different from that of an adult.

Faced with Chen Yi's compliment, Kang Qin smiled and said, "It's nothing. They are all stupid. Force cannot solve the problem. It depends on the brain."

"Huh?" Chen Yi was surprised. It felt strange to hear this sentence coming from a student's mouth, "You are right, it does require brains. I have a few questions to ask. I hope you can answer them truthfully. "

Kang Qin: "Say."

Chen Yi: "In the past five years, have any major events happened in the school, such as who was injured, who went missing, ambulances came, etc."

Kang Qin thought for a while, shook his head and said, "No."

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

Kang Qin: "That's true, not much."

Chen Yi: "How do you evaluate the principal?"

Kang Qin: “I haven’t seen it a few times, so I can’t comment.”

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

Kang Qin shook his head: "No."

Chen Yi narrowed his eyes slightly and took a step forward to stare at Kang Qin.

Kang Qin was not prepared and subconsciously backed away: "What's wrong?"

Chen Yi: "You and Guan Xinmei are not in the same class at all, and they are incompatible with each other, but it seems like you are very familiar with her?"

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 takes great care of her, it means there is a problem. Why did you deny it just now?"

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

Chen Yi: "Didn't you say that? It's not that you don't know. We have audio and video of the entire process. Do we need to play it back for you?"

Kang Qin's tone was choked, and he said helplessly: "Uncle policeman, can we stop talking about words? What's the difference between [no] and [don't know], then I will change it now. I don't know if there is a problem between him and Guan Xinmei."

The girl lied.

After all, students are students, no matter how mature they are, they are still students, and they cannot be flawless 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 represent yes.

She knew something was wrong but denied it.

"Classmate Kang Qin." Chen Yi said, "Your principal Kou Chaoyi has been arrested and will spend a long time in prison in the future. If you have anything to say, you can tell us and the police 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 more ordinary.

Does Kou Chaoyi choose his target based on appearance? uncertain.

There is something special about Kang Qin. It is difficult to encounter him in school. This is also a kind of charm. At least he is very lethal to his peers.

Just imagine when you were young, didn’t everyone admire the mature girls in the class? Even more touching than the appearance.

Missing Silly Baitian is a regret in adulthood, and I was completely unaware of it at the time.

Being silly and sweet as an adult is an advantage, but being silly and sweet as a child is a disadvantage.

"It's nothing. I've never been bullied in school. They can't bully me." Kang Qin was very confident.

Chen Yi believed this.

If you can bully someone casually, how can you become the student council president?

Kang Qin left.

He didn't ask anything, but he most likely knew something and chose to lie.

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

Next, we will wait for the on-site investigation to be completed, and then return to the Municipal Bureau to interrogate Kou Chaoyi and ask him what happened to the bloodstains in his office.

This time, he can't hide in his own office.

The workload is relatively large, 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 have begun to emerge.

One person's DNA was completely extracted.

As time went by, the second person's DNA was completely extracted.

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

There was no fourth different DNA.

Three people.

In Kou Chaoyi's office, three people's blood was spilt, the scene was tragic, and life and death 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 an order before interrogating Kou Chaoyi, "Also, go and extract Du Xun's father's DNA and continue to do DNA paternity tests."

After leaving two words, he entered the interrogation room.

Kou Chaoyi was already handcuffed and sitting quietly on a chair. Chen Yi came in and did not let him look up.

It was a preliminary hearing.

The source of the bloodstains was unknown, the identity of the owner of the bloodstains was unknown, and the owner of the bloodstains was unknown. It was actually difficult to get a confession.

However, the bloodstains existed, and Kou Chaoyi could not deny it.

Everyone hoped that this was just a case of intentional injury.

It was enough to be alive.

Chen Yi stood in front of Kou Chaoyi.

"Raise your head."

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 again with a blank expression and answered: "I don't know."

"Raise your head."

Kou Chaoyi didn't move.

Chen Yi reached out and grabbed his hair, pulled it up hard, and then leaned in to stare into his eyes: "Three people's blood was found in your office, and you didn't tell me?"

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 seems that this will be a long-lasting interrogation.

Three hours later.

The Municipal Bureau Laboratory.

The testing police officer picked up the last printed paper, confirmed that all the information was correct, opened the door and walked out of the room 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: I don't know.

It was just the discovery of bloodstains. The police didn't even know what the situation was, and it was far from the point of conviction. Anyone with a strong psychological quality would not choose to confess at this time.

There was a knock on the door, and the police came in and handed the comparison results in his hand to Chen Yi.

"Captain Chen."

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

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

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

Chen Yi's eyes suddenly became sharp.