In line with the principle of not destroying the evidence, he brought the computer into the conference room, emptied a large number of tables, and Wang Liang quickly dismantled all the display screens.

More than ten years ago, assembling a computer was a technical job, and you could charge money for assembling it once, but now basically everyone who plays with the computer will do it. But that doesn't mean everyone can take the display apart and inspect it.

Most people never dismantle the display.

Wang Liang spent more than half an hour disassembling the display screen very carefully, as long as the wires could be removed.

"This display screen has been dismantled once, it was dismantled by Wang Huadong a few days ago, and there is only one trace of disassembly. Wang Liang finally said.

"Can you see this?" Wang Huadong leaned closer, obviously a little distrustful of Wang Liang's level of trace science.

"Basically, anyone who sells mobile phones can see whether there are traces of disassembly of the mobile phone, and many of your screws have only traces of the current one, and they are the same screwdriver, who else can you be?" Wang Liang finally confirmed: "Is this okay to install, there is no value in investigation." ”

"Good. Bai Song nodded, and said expressionlessly: "Then check the main chassis." ”

Bai Song has already seen that Wang Liang's dismantling is much more thorough than Wang Huadong's dismantling. After Wang Huadong opened it, he removed the large pieces, and then carefully looked at whether there was any special structure, and that's it.

At this time, the large round table in the conference room was already full of people.

All the people came, and these people who stayed in the hotel came here on a business trip for this case, and they must have come to see the excitement when they heard about it.

"The main chassis has been dismantled many times. Wang Liang said: "The memory module has also been added, but this is normal, this is originally an assembly machine, it is estimated that after playing for a few years, the memory is not enough and I bought a new one." ”

"It's normal, you take care of the dust and remove it slowly. Bai Song said.

"Inspector Bai, what can I find here?" Captain Wang here asked, "What can be a problem here?"

"I'm not sure. Bai Song frowned and watched Wang Liang dismantle the computer.

"Take the CPU out and I'll take it out. Bai Song said.

"Why are you dismantling this? Isn't it dismantling the memory?" Wang Liang asked curiously.

"Demolition. Bai Song didn't say much.

"Good. Wang Liang found that he was very happy to have someone order him.

When there is no clue about handling a case, the whole person will collapse, but being able to come up with a clue and arrange useful work, Wang Liang feels that he is energetic in his work. Over the past few years, Bai Song has become accustomed to listening to Bai Song when handling cases.

There is a fan on the outside of the CPU, and there is a very rudimentary heat sink underneath, which is the CPU after it is removed. The heat sink of a good computer is copper-core, and this is estimated to be aluminum.

It was full of soil, and Wang Huadong didn't clean it up at all. It's not that Wang Huadong is lazy, but the previous dismantling was carried out in the room where the computer was placed, and there was no need to clean up the soil.

The CPU is dirty and greasy, and it looks disgusting, and it is estimated that it has not been cleaned for at least four or five years.

"Is this normal?" asked Bai Song.

"Normal. It's normal to have anything in this broken computer, and it's normal to have a few D hairs wrapped around this fan. Wang Liang said, feeling a little disgusting: "I installed it." ”

"Unplug the CPU," Bai Song continued.

"This thing is tightly fitted, if there is a lost thing, the computer will not be able to turn on", I am afraid that Bai Song will not believe it, Wang Liang continued.

Seeing that Bai Song was unmoved, Wang Liang could only gently take off the CPU, and with this simple action, more than a dozen people leaned their necks over to take a look.

"Look, nothing. Wang Liang held up the CPU.

It's normal to have nothing, something as delicate as the CPU, and if you can stuff something useless between the motherboard and make the computer run normally, then if you have this technology, you can simply save a lithography machine by hand.

"What's that?" Bai Song pointed to a white line under the CPU slot. "This white line is very, very thin, and if it weren't for the darkness around it, you wouldn't be able to see it at all.

As soon as Bai Song's words came out, everyone stood up and gathered around.

Wang Huadong immediately took out a magnifying glass and came over, and Wang Liang hurriedly got out of the way.

As you can see from the magnifying glass, there is a little bit of white powder seeping into the edge of the CPU, and if you don't look closely, you really can't see clearly.

There's too much dirt and dust in it.,The computer is powered on.,The CPU fan keeps turning.,And it's still hot air here.,Basically, everything has been blown away.,But there's still some in this crack.。

"Hua Dong, do you remember the aluminum alloy doors and windows in Yao Xin's case?" asked Bai Song.

Wang Huadong was struck by lightning!

Oh, yes!

A lot of traces of the scene will be destroyed.

In the Yao Xin case, the fire was combined with fire extinguishing, and 99% of the evidence at the scene was lost, and only a little remnant of styrofoam was found in the two tightly fitting aluminum alloy doors and windows, which became the key evidence to solve the case.

In this case, everyone felt very calm, and there was no possibility of the evidence being destroyed, but they never thought that the computer turned on itself was actually the best means to continuously destroy the evidence.

The deceased was only found hours after his death, and the computer was running all the time.

At a micro level, a high-temperature CPU and fan are no less than a fire and water.

"What's this white powder?" someone asked.

"Could it be cyanide? ”

"Then don't open the window quickly, don't get so close. ”

"Damn, this is scary", and immediately someone wanted to open the window.

"Don't move!" Bai Song shouted to the policeman who was about to open the window: "Cyanide can decompose quickly in the air, how can it be stored for so long?"

Bai Song's words seemed to have a kind of magic, and everyone immediately stopped worrying, and someone asked directly: "Inspector Bai, what is this?"

"This one needs to be tested finally. Bai Song was a little disappointed when he saw everyone's expressions: "However, there is a high probability that this thing is sodium formate." ”

"What?"

"What is sodium formate?"

"It's baking soda, soda ash. ”

"That's sodium formate..."

"Oh oh, how could this be..."

Bai Song ignored the others and asked Wang Liang: "With your experience, what temperature can the CPU reach when this broken computer runs those legendary games?"

"Generally, the temperature of the CPU will not exceed 55 degrees Celsius when running games, but this computer is not good for heat dissipation, the CPU is not good, and the motherboard is not good, it is estimated that it can reach more than 70 degrees. Wang Liang estimated.

"Hmm. Bai Song looked at everyone: "Of course, this may also be potassium formate, etc." Actually, this thing is not so troublesome, what I want to say is that the murderer kills people by relying on this CPU. ”

"Inspector Bai, do you mean that the murderer put cyanide here?" Detachment Zhao asked, "If so, when did you put it in?" If it was put in fifteen days before the crime, what cyanide can be stored for so long?"

"Originally, it didn't work, but wax-sealed sodium cyanide do. Bai Song's words are astonishing: "Many substances that can react with air will be stored in paraffin wax or kerosene, and many things in our daily life can also be melted and sealed with household candles." If you take a small amount of sodium cyanide, seal it with wax, and put it between the CPU and the fan, there will be no problem on weekdays. You know, household candles will soften at more than 40 degrees, and they will simply melt at 70 or 80 degrees. Sodium cyanide will be naturally hydrolyzed to produce hydrogen cyanide in humid air, and it can be quickly decomposed above 60 degrees. ”

"It can be like this!" Wang Liang was a little excited: "In that case, the murderer entered this room fifteen days in advance, and then put the wax-sealed sodium cyanide here, and then waited for Xiao to turn on the death button himself!"

Thinking of this, Wang Liang looked at the boot button with some trembling and muttered: "I didn't expect that this is actually the death button..."

Wang Huadong was speechless when he looked at Wang Liang's second middle school appearance, and looked at Bai Song: "Why is there sodium formate left?"

"Sodium cyanide encounters water and carbon dioxide in humid air, can produce sodium formate, hydrogen cyanide and other substances, hydrogen cyanide is highly toxic, a few milligrams per cubic meter are dangerous to the human body, in a humid environment above 60 degrees, the concentration of hydrogen cyanide will quickly reach a lethal dose. Sodium formate does not continue to decompose at this temperature, so these things should be the remaining potassium formate. Everything else was blown around by the fan and mixed in the dust. Bai Song explained: "This is the method of killing. ”

"Inspector Bai, I look at you, you seem to be confident, do you have anything else to say, let's say it together. An expert from the higher level looked at Bai Song and said with some interest.

"Sun Lao is good", Bai Song greeted this first, and then said: "At present, I think that the murderer may be one of the people who stole the electric car battery. ”

When Bai Song said this conjecture, no one had any surprised expressions, that is, a few people had more doubts. Because in the beginning, many people thought about this question, but there was no other evidence to support it.

"I continue", Bai Song cleared his throat: "The reason why we didn't find this when we checked the family where the battery was stolen is most likely because this household didn't call the police." Over the years, except for some people who don't care about the battery of electric vehicles, the others have not called the police, and there is a high probability that they do not trust the police. Why do I say that this man did it? Because there are several good conditions for committing the crime.

First, Xiao's key was lost, as a new thief, he was likely to fall in the process of stealing things, and was picked up by the owner; second, the police have visited many communities and asked if there was any electric car battery stolen, and the suspect has been caught. Third, the police went to Xiao's home to check, if the murderer wanted to know where Xiao's home was, he could find out by tracking the police, and the police station would not care about anything else at all, and he would not pay attention to it if he was secretly followed. ”

"It doesn't make sense, why don't you trust the police, and if the people who lost the electric car already know that the police have caught the thief, why don't they call the police?" someone asked.

"This one is almost a given. There is a high probability that a person who can commit such an act as a murderer, and it is such a sophisticated behavior, that person has a big problem in itself, for example, he is a murderer on the run, and it is impossible to take the initiative to contact the police. I don't know if you can approve of this reverse explanation?" Bai Song looked at everyone, and then said: "If he commits a crime, he can make this kind of case, and the traces can be cleaned up, and when Xiao goes back after fifteen days, he will definitely close the door and play on the computer, then he will basically die." ”

"Then why did Xiao run out?" asked the Zhao detachment.

This is a point of miscalculation by the murderer. Bai Song explained: "The murderer thought that Xiao would be quickly poisoned and then die at home. According to Xiao's otaku nature, no one will know that the corpse stinks. Once seven or eight days have passed, everything in the house has been covered up, and the hydrogen cyanide is long gone. If the computer runs for seven or eight days, it is estimated that this sodium formate will not be found. And at the scene of high corruption, our focus may be on the corpse. It's winter, and it may even take more than ten days to be discovered.

After Xiao showed very uncomfortable sensations such as chest tightness and shortness of breath, he felt that something was wrong, and then ran out and went up the stairs, but fell there, never got up, and died of acute cyanide poisoning. In this way, the door is open, so even if there is hydrogen cyanide gas, it will quickly drift away, and by the time someone finds it in the hallway, that is, a few hours later, the scene has already run out of hydrogen cyanide gas. ”

The Zhao detachment nodded with satisfaction, and arranged for someone to collect this milligram-level white powder, and arranged for someone to go for testing overnight tonight.

"Why would you kill someone because of a trivial matter? I really can't figure it out. Someone asked.

"Tonight's suicide was actually because of a trivial matter. Bai Song said: "I don't know if you have experienced a difficult time, sometimes when you are having a hard time, someone provokes you, and you even want to stab the sky and kill the other party." We don't show it here, in some areas, some homicides really come from the sentence 'what do you see'. ”

"Yes, what Inspector Bai said is reasonable, we don't know what happened to the murderer at the time, but it is estimated that we attach great importance to this electric car or have an urgent matter that has been delayed, plus what Inspector Bai said, the murderer himself may be a murderer on the run or something, and he is angry, so he designed such a scene. It doesn't require much knowledge of chemistry, just clever design. The superior expert nodded affirmatively: "I think this idea is very reasonable, now that we have so many people, we might as well go and check, how many households are there in these communities, who have not reported the case but lost their batteries." ”

"Good!" all the teams geared up.

This posture has a feeling of red and blue confrontation.

(This cup is two cups, and today's 10,000-word update is OK)