Chapter 95 Three-hour window period

Zhou Ning followed Xu Dayuan and ran towards a building behind the office building. When he arrived at a room on the third floor, the door had been opened.

The room was full of various test equipment. It was obviously a laboratory. When he saw a few familiar criminal policemen squatting in a corner, Zhou Ning hurried forward. Zhou Xiaoyu was lying on the ground and had fainted, with tape on his mouth.

, his hands and feet were tied with white ties.

Zhou Ning quickly squatted down, cut off the tie, and raised his hand to test Zhou Xiaoyu's carotid artery. His heartbeat was normal. As his fingers passed over his hair, a blow injury on the back of his head was revealed. It was just a crescent-shaped skin injury.

, such a trauma will not lead to coma.

Zhou Ning's heart was already in her throat, and her eyes were a little sore.

Quickly holding the person in his arms, gently patting Zhou Xiaoyu's cheek, Zhou Ning called out.

"Xiaoyu, Xiaoyu wake up!"

Zhou Xiaoyu slowly opened her eyes, and when she saw her opening her eyes, Zhou Ning felt relieved.

"Brother, why are you here? Why am I here?"

"Do you remember what happened?"

Zhou Xiaoyu held her head and sat up, seemingly still a little dizzy.

"I don't know. Wait, Cui Guanglin hit me with a water glass. When I fell, he jumped up and covered my mouth. Then I don't remember it."

Zhou Ning checked the back of Zhou Xiaoyu's neck again and pressed around the wound to confirm that the injury was not serious and that there were no fingerprints on her neck. Seeing that her lipstick was a little smeared, she quickly used a cotton swab to extract the area around Zhou Xiaoyu's lips and nasal cavity.

He put away the cotton swabs and then comforted:

"Okay, everything is over. Now let's think about it. When and where did you meet Cui Guanglin today?"

Zhou Xiaoyu rubbed her wrist. Some of the scars on it were broken. She took a breath in pain.

"I just arrived at school in the morning and saw Cui Guanglin in the corridor of the office building. He waved to me and I put my bag back in the office. I felt that you were right and I had something to say clearly, so I left the office and stood at the corner of the corridor.

location to see him.

He said that whether he continued to prepare for marriage in the future or stopped it, at least he had to make it clear that there were too many people here and it was better to go to the laboratory to be quiet. I followed him to the laboratory on the third floor of the science and technology building.

But as soon as the door opened, he hit me on the back of the head from behind, and then he covered my mouth and nose. I was very panicked and didn't know what Cui Guanglin was going to do. I struggled a few times, but I had no strength, and then I didn't know anything.

Oh, brother, what’s going on?”

Zhou Ning hugged Zhou Xiaoyu who was still trembling, feeling scared for a while, patted her back and comforted her:

"Don't be afraid, brother is here. You and my colleagues will go to the hospital for a checkup first. As for Cui Guanglin, we have caught him. As for his matter, the investigation here will be completed later. I will tell you, Da Zhao, please help me."

Find someone to take Xiaoyu to the hospital!"

Da Zhao had already come over and helped Zhou Xiaoyu up.

"Don't worry, I'll ask Sister Feng to take Xiaoyu to the hospital, and you can call Director He."

Zhou Xiaoyu held Zhou Ning's hand, her face looking a little anxious.

"Don't tell my mother!"

"Don't worry, I won't tell you. If you tell me, it will make them worry. But you have to listen to me and go and check it out."

Zhou Xiaoyu nodded and followed Da Zhao downstairs. Zhou Ning glanced at where Zhou Xiaoyu had just been sitting on the ground. Under a table next to him was a cabinet with all the doors open. There were traces of rubbing and stepping on it.

Ning narrowed his eyes.

"Xiaoyu was stuffed into this cabinet?"

Xu Dayuan patted Zhou Ning on the shoulder. He could feel Zhou Ning's anger. If it were him, he might not be able to control his emotions.

"Not only did they stuff Xiaoyu inside, but they also locked it. The laboratory has been searched once. During the second search, they opened the cabinet and looked inside. Only then did they find Xiaoyu's. Fortunately, she is okay."

Zhou Ning nodded. This sentence is the key. Fortunately, everything is fine. If something happened to Xiao Yu, Zhou Ning wouldn't know how to blame himself.

"I should have let Xiaoyu rest for a few days last night, but I was careless."

"Come here, don't be sad for me. There are so many teachers in the multi-purpose hall. I'll go and deal with it first. Cui Guanglin will be taken away. You can check here and go back to the team. Da Zhao will stay to help.

Actually, I don’t understand why Cui Guanglin controlled Xiao Yu?”

Zhou Ning shook his head. He couldn't understand this. If Cui Guanglin was really the murderer of the 3.10 case, he might also be the murderer of the red serial murder case. Such a person has severe obsessive-compulsive disorder and is so rigorous.

The only ones who missed the calculation were the fishermen, but what happened today?

Is it because of the reaction of the Zhou family?

Still, if you don't get it, you will destroy it. Thinking of this, Zhou Ning is even more frightened and takes a deep breath to control his emotions.

"Xu Da, go and do your work. I'll ask Xiao Qu to check the surveillance in the building. As for this place, it's not difficult for a chemistry teacher to create some chemical agents that can make people temporarily comatose."

Xu Dayuan waved his hand and led the people away. Da Zhao ran back quickly.

"Sister Feng sent Xiaoyu to the hospital with the 120 car. Did you call?"

Zhou Ning took out his cell phone and dialed He Shancun's number.

"How good can I be, Zhou Ning."

"Talk about something, I'm busy!"

"My sister Zhou Xiaoyu was sent to your hospital by 120. She will arrive soon. She was hit on the occipital area and checked for fractures and concussion. In addition, I suspected that she was unconscious. I collected samples from the edges of her nasal cavity and lips. I don't know.

If there is any residue, please help me check it carefully with Xiaoyu.

According to what Xiaoyu said, she was knocked unconscious before eight o'clock, and she was awakened by me just now. If it wasn't an anesthetic, what chemical agent could cause such a long coma?"

He Shancun paused, obviously shocked by Zhou Ning's words.

"What, your would-be brother-in-law did it? I remember you said last night that he teaches chemistry, right?"

"Well, give me a direction. I'm in the chemistry laboratory of their school."

"Don't worry, as inhalational anesthetics, we commonly use sevoflurane and desflurane, but there are many similar halothane, enflurane, and isoflurane that can also be used as anesthetics.

I remember reading in some magazine that as long as hexafluoroisopropyl alcohol and dimethoxymethane can be reacted in the presence of a catalyst, and then some strong acid or the like is added, sevoflurane can be obtained. As long as you are a master of chemistry.

, these are not difficult things.

But this thing is a gas and is not easy to store, while halothane is a liquid with an aromatic smell, but its stability is not good."

Zhou Ning was a little confused, but he remembered the names.

"Understood, I found these chemical preparations. If Cui Guanglin's fingerprints are on them, that's fine."

"Well, that's pretty much what it means. By the way, look in the trash can. If he has used it, at least throw away bottles, gauze and other things around. These things will metabolize into hydrohalic acid when exposed to light or heat. This can be tested."

"Thank you, Xiaoyu, I'll leave it to you."

After hanging up the phone, Zhou Ning looked at Da Zhao.

"Let's start looking. Cui Guanglin's fingerprints have just been collected. We need to look for bottles and gauze in the trash can. If we find halothane, hexafluoroisopropyl alcohol and dimethoxymethane here."

Da Zhao nodded.

"Don't worry, I heard it and found the words. Let's do it!"

With that said, Zhou Ning began to search all the test benches. After looking at it, Zhou Ning went straight to the trash can at the door. As soon as he opened it, he saw a piece of gauze and a brown glass bottle thrown on top. He directly picked out the two items.

Fingerprints were collected on the brown bottle, and Zhou Ning discovered without comparing it that there was a mark on the edge of the fingerprint, which was obviously a mark left by a band-aid.

"Dazhao, I found it!"

Da Zhao came over and put the tie into the evidence bag.

"It seems that this person was in a hurry and didn't have time to deal with these things."

Zhou Ning nodded, put all the evidence bags into the investigation box, and stood up.

"In the first class at eight o'clock, Cui Guanglin led Xiaoyu here and stuffed her into the cabinet while she was unconscious. Too much time has been wasted. Let's go see Xiaoqu's place to see if there are any new discoveries."

The two went downstairs and drove towards the guard. It was lunch break and many students were looking at them. The police car was still too conspicuous in the school.

When I arrived at the guard's guard room, I saw Xiao Qu waving his hand as soon as he entered.

"This Cui Guanglin seems to be very familiar with surveillance on campus. He avoids surveillance during get out of class. Even when he cannot avoid it, he hides among the students. I found a few pictures. Look here at 8:45. He walks through the side door. Go out and follow a few students.

Then at 8:59, we entered the staff dormitory building, but there was no surveillance here. The guard who was just on duty said that the surveillance on their faculty and staff floor had been broken for a long time. I didn’t know he was there between 8:59 and 11:50.

where."

What can Cui Guanglin do in the three-hour window?

"Let's go to the dormitory building. Master has already passed by."
Chapter completed!