When did Lu Weiwei become so smart? Officer Wang suddenly felt that he was a little marginalized?

He looked at Lu Weiwei, then at Gu Chen, and couldn't help but exclaimed: "Is that so?"

"It should be." Gu Chen didn't say anything too harshly, he just analyzed the problem from his own perspective: "Senior Brother Wang, that's what I think."

"We found no dangerous nitroglycerin, no flammable and explosive substances at the scene, and no traces of burning."

"But how did this explosion occur? For example, it was pressure."

Gu Chen showed him the content of his repeated deductions and graffiti in the notebook: "Brother Wang, look, the only clues we can find at the scene are big rocks, piano wire tied to the glass bottle cap, and water and alcohol.

."

"Putting these four things together can completely present such a picture."

In order to express his reasoning better and more straightforwardly, Gu Chen turned the notebook to a blank page again.

Using my good drawing skills, I drew the scene I just deduced using my entry-level imagination on a blank piece of paper.

Gu Chen first drew a glass bottle, and then drew some wavy lines at the mouth of the glass bottle, marking it as water.

Lu Weiwei immediately moved closer, looking straight at the page.

Gu Chen then marked the mouth of the bottle as sealed, and then drew a larger glass bottle with a larger mouth on the outside.

"Gu Chen." Officer Wang was a little confused and asked him hurriedly: "You mean, you want to put this sealed glass bottle filled with water into this large-mouthed glass bottle?"

"That's right." Gu Chen nodded and added, "But now is the most critical time, because I need to put dry ice and alcohol around the sealed glass bottle."

Based on his own narration, Gu Chen drew some square objects between the large-mouthed glass bottle and the sealed glass bottle filled with water and labeled them as dry ice, and drew some wavy lines to label them as alcohol.

Then, Gu Chen put a lid on the large-mouth glass bottle, pressed a stone on top, and tied the stone firmly to the lid with piano wire.

"I understand." Looking at Gu Chen's paintings clearly, Lu Weiwei's reasoning just now was instantly reflected in Gu Chen's paintings. She immediately smiled and said: "At this time, when alcohol and dry ice are put together, the temperature can be lowered.

to about -80 degrees Celsius.”

"The water in the glass bottle freezes, expands in volume, and explodes."

Glancing at the still damp bookshelf, Lu Weiwei added: "At that time, this specially treated glass bottle had been secretly placed on the bookshelf when I was on duty in Gaocheng."

"At that time, Liao Feng was inexplicably called away, so there was only one person in the laboratory, Gao Cheng. If he was injured, it was very likely that no rescuer could be found."

Officer Wang also walked to the bookshelf, suddenly turned around and said: "It was Zhang Hao. It was Zhang Hao who called Liao Feng away. If the murderer only targeted Gao Cheng, then he would definitely not let anyone else stay in the laboratory."

."

"Yes, it's Zhang Hao." Gu Chen also snapped his fingers, and then said: "This can explain why when Gao Cheng was injured, Zhang Hao was eating with Liao Feng and other friends."

"Because he cleverly used the difference in reaction time between dry ice and alcohol to stagger the time to create the explosion."

"And Liao Feng and other Zhang Hao's friends became his alibi witnesses in a daze."

"So that's it." Officer Wang raised the corner of his mouth, and then he said with relief: "I mean, how could the person with the most murderous motive not be at the scene? It turns out that he used the properties of dry ice and alcohol to have a good time with our police.

, we were all deceived by him.”

Gu Chen also said: "For now, the most important thing for us is to find evidence of Zhang Hao."

"Because there is no dry ice substance at all in this office, nor is there any alcohol. If he wants to create this explosion, he must obtain these two substances, and he also needs to complete the arrangement in a very short time."

"So I think he should have secretly simulated it a few times, otherwise it wouldn't have been so smooth."

"But since there is a simulation, it will definitely reveal its flaws. After all, we now know that the form of explosion is related to the fusion of dry ice and alcohol."

"But Zhang Hao doesn't know that we know it yet, so this is also an opportunity."

"Yes." Lu Weiwei agreed 200% with Gu Chen's opinion: "Zhang Hao is cunning enough, but he will be unlucky when he meets us."

"That old man." Officer Wang suddenly looked out the window, pointed outside the door and said, "He is the only person who knows the distribution structure of Nanshan Laboratory. Let's call him over to help and investigate the nearby surveillance overnight."

"Okay." Gu Chen agreed.

After leaving the crime laboratory, Gu Chen and Lu Weiwei went to ask the old guard, and under the leadership of the old guard, they went to the lower floor of the crime laboratory and met Officer Wang.

"This is the office where experimental items are stored. Because they are all chemicals, the professor usually doesn't let us come in and out at will. Only when you come to me with the professor's approval note, will I open the door for these people."

While the old doorman explained, he also took out the key from his body, and then opened the door to the room where the items were stored.

Lu Weiwei walked in first and turned on the light.

Then Gu Chen, Officer Wang, and the guard entered last.

"Has anyone been here this afternoon?" Gu Chen asked.

The old guard scratched his head and thought: "It seems that only Zhang Hao came here in the afternoon. He said he was going to conduct some freezing experiment and asked me to bring some alcohol and dry ice."

"You also know these things?" Lu Weiwei was curious.

The guard smiled, waved his hand and said, "Hi! Do you know anything about this? I also helped in the school laboratory in the early years, so I still know some things."

"It is indeed Zhang Hao." Gu Chen smiled at Lu Weiwei and Officer Wang, feeling that everyone's reasonable reasoning was absolutely correct.

This chapter is not finished yet, please click on the next page to continue reading the exciting content! Indeed, Zhang Hao, the most suspect, has been to the laboratory, and the materials needed are exactly dry ice and alcohol.

This just confirmed everyone's previous suspicions.

"Uncle." Gu Chen smiled and said to him: "Zhang Hao took away the dry ice and alcohol this afternoon. Do you have any records?"

"Yes, both." The old man responded readily, and then found a marked key on another set of keys.

Use it to open the desk drawer at the door and take out a thick record book from inside.

"Come over and take a look. Everyone who has been to the material room has a record here with the date and time." The old man began to flip through the latest one.

At this moment, the record of Zhang Hao receiving materials appears at the bottom.

This also shows that Zhang Hao was the last person to receive chemicals before the explosion in the laboratory.

Afterwards, Gu Chen flipped through other records, and time moved forward one by one.

It is not difficult to see that in just half a month, Zhang Hao went to the material room many times to collect alcohol and dry ice.

Apart from this, everyone else received other substances. Although there was also alcohol, Zhang Hao was always the only one who received dry ice.

"That's it." Gu Chen tapped his hand on the record book, then quickly took out his mobile phone and took pictures of these scenes.

The guard was a little confused and asked Gu Chen: "Comrade police, what do you want these for? Is it to collect evidence? Do you suspect Zhang Hao?"

Seeing that the guard was a little curious, Gu Chen couldn't tell her right away. He could only smile and ask: "By the way, sir, is the surveillance above your head useful?"

"Yes, they are all useful. What if a thief breaks in if they are not useful?"

"Then help us remove the surveillance camera." After hesitating, Gu Chen added, "By the way, just adjust the video of Zhang Hao receiving the materials. As for the time, just check it according to the registration date."

"Well..." The guard was a little embarrassed, but he still agreed: "That's okay, but the control room is usually empty at night, but the machines are always on."

"It doesn't matter, we can do it ourselves." Lu Weiwei said.

For Lu Weiwei, who often goes to the branch dispatch room to break in, she already knows the various operations of these monitoring instruments, and there is no big problem.

The old doorman immediately took off another key from the key board, pointed to the end of the corridor and said, "The control room is at the top of the stairs. Go check it out yourself."

"Thank you, uncle."

After a few people said goodbye briefly, they opened the door to the monitoring room.

Gu Chen then used the date and time he took to retrieve various scenes of Zhang Hao.

After completing all the work, it was already four o'clock in the morning.

The old man, who had been wearing a military coat and standing at the door, yawned from time to time, and his eyes were bloodshot.

When he saw these energetic police officers coming out, he asked with relief: "Is there anything else you need help with?"

"Where is Zhang Hao's home?" Officer Wang asked.

"It's not far from here, just in that community over there." In order to provide the police with detailed directions, the guard pointed to a building on the side and said, "Did you see it? It's on the far left of that building, on the 27th floor."

Lu Weiwei smiled: "Sir, you remember it so clearly. You even know the specific location of Zhang Hao's house."

"Zhang Hao didn't tell me himself. He likes to show off. I may not be able to remember it after hearing it once, not even two or three times. But when he just told me the location of his home, he told me the location of his home for at least ten times.

times, so I remembered it." The guard told the truth.

Thinking about the harvest tonight, Gu Chen was also very happy from the bottom of his heart.

The doubts at the time seemed to have been solved now, and in the evening everyone also collected various evidences of Zhang Hao's collection of materials.

In this way, even if he wants to quibble, he will be full of mistakes and omissions.

"Junior Brother Gu." Lu Weiwei walked up to Gu Chen and showed him her lady's watch: "It's almost dawn now, do you want us to catch him tomorrow?"

"No, it should be today, and it should be that night." Gu Chen had no room for negotiation.

Officer Wang also agreed: "At this time, Zhang Hao's energy becomes less concentrated. Taking him back to Furong Branch for interrogation at this time may have better results."

"Then it's settled." Gu Chen also said.

After the three of them said goodbye to the guard for a short time, they drove together to the nearby Meilin Community.

This is a mid-range community. The housing prices in Jiangnan City are ranked medium, and the property is not very attractive.

When Gu Chen parked the car at the door, he explained the situation to the security guard on duty and went directly to Zhang Hao's house.
To be continued...