In line with the principle of not destroying evidence, he brought the computer into the conference room and cleared a large area of ​​the table. Wang Liang quickly took apart the display screen.

More than ten years ago, it was a technical job to assemble computers, and you could collect money once assembling them. Nowadays, most people who play computers are in the city. But this does not mean that everyone can also disassemble the display screen for inspection.

Most people have never taken apart the display.

It took Wang Liang more than half an hour to disassemble the display screen very meticulously. All the wires that can be removed were removed.

"This display has been dismantled once. It was dismantled by Wang Huadong a few days ago. There was only one trace of dismantling." Wang Liang finally said.

"You can see this?" Wang Huadong leaned closer, obviously distrustful of Wang Liang's level of trace science.

"Basically, the sellers of mobile phones can see if there are any traces of disassembly of the mobile phone. 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: "This Is it okay to pretend? There is no value for investigation."

"Okay." Bai Song nodded, and said blankly: "Next, check the main box."

Bai Song had already noticed that Wang Liang's dismantling was much more thorough than Wang Huadong's dismantling. After Wang Huadong opened it, he unloaded the big piece, and then took a closer look at whether there was any special structure, that's it.

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

All the people are here. The people who stayed in the hotel came here on business for this case. I heard that this matter must come to see the excitement.

"The main box has been dismantled many times." Wang Liang said: "The memory module was also added, but this is normal. This is originally an assembly machine. I guess I bought a new one after playing for a few years without enough memory."

"This is normal. Be careful of the dust and remove it slowly." Bai Song said.

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

"I'm not sure either." Bai Song frowned, watching Wang Liang take apart the computer.

"Take out the CPU and let me see." Bai Song said.

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

"Dismantle." Bai Song didn't say much.

"Okay." Wang Liang found that someone ordered him to be very happy.

When there is no clue in handling a case, the whole person will collapse, but being able to figure out the clue and arrange useful work, Wang Liang feels that he is working hard. Over the years, Wang Liang has become accustomed to listening to Bai Song when handling cases.

There is a fan outside 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 a copper core, which is probably aluminum.

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

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

"Is this normal?" Bai Song asked.

"Normal. Everything in this kind of broken computer is normal, and a few dangling hairs in this fan are normal." Wang Liang said, feeling a little sick to himself: "I installed it."

"Unplug the CPU," Bai Song continued.

"This thing fits closely. If there is something missing, the computer won't turn on," Wang Liang continued, afraid that Bai Song would not believe it.

Seeing that Bai Song was unmoved, Wang Liang could only gently remove the CPU. With this simple movement, more than a dozen people poked their necks and looked over.

"Look, there's nothing." Wang Liang raised the CPU.

Nothing is normal. If there is something useless between the CPU and the motherboard to make the computer run normally, then if you have this technology, you can simply build 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. If it weren't dark around it, it wouldn't be visible at all.

As soon as Bai Song said this, everyone stood up and gathered around.

Wang Huadong immediately took out a magnifying glass and leaned over, Wang Liang hurriedly walked away.

You can see from the magnifying glass that there is a little bit of white powder infiltrating the side of the CPU. If you don't look closely, you can really see it clearly.

There is too much dirt and dust in it, and the CPU fan keeps spinning when the computer is powered on, and there is still hot air here, and basically everything has been blown away, but there is still some in this gap.

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

Wang Huadong was struck by lightning!

Yes!

Many traces of the scene will be destroyed.

In the Yao Xin case, 99% of the evidence at the scene was lost due to the fire and fire fighting. Only a little styrofoam was found in the two closely fitting aluminum alloy doors and windows, which became the key evidence to solve the case.

In this case, everyone thought it was very peaceful. There was no possibility of loss of evidence, but they had never thought that the computer that was turned on was the best way to continue to lose evidence.

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

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

"What is this white powder?" someone asked.

"Could it be cyanide?"

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

"Fuck it, this is too scary", and someone was going to open the window immediately.

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

There seemed to be a kind of magic in Bai Song's words. Everyone immediately stopped worrying. Someone directly asked, "Inspector Bai, what is this?"

"This requires a final test." Bai Song saw everyone's expressions a little disappointed: "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 oh, how come there is this..."

Bai Song ignored the others and asked Wang Liang, "Based on your experience, what temperature can the CPU reach for this broken computer to run those legendary games?"

"Generally, the temperature of the CPU does not exceed 55 degrees Celsius when the game is running, 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 70 degrees or more." Wang Liang estimated.

"Yeah." Bai Song looked at everyone: "Of course this could also be potassium formate, etc. In fact, this matter is not so troublesome. What I want to say is that the murderer relies on this CPU."

"Inspector Bai, do you mean that the murderer put cyanide here?" Zhao Detachment asked: "If that's the case, when was it put in? If it was put in fifteen days before the incident, then what? Can cyanide be stored for that long?"

"It wasn't possible, but wax-sealed sodium cyanide would do." Bai Song said astonishingly: "Many substances that can react with air are stored in paraffin or kerosene. Many things in our daily life can also be used at home. Seal the candle after it melts. If you take a small amount of sodium cyanide, seal it with wax, and place it between the CPU and the fan, you won’t have any problems on weekdays. But when Xiaomou came back to play the game, the CPU became hot and the problem It's big! You know, household candles will soften above 40 degrees, and they will simply melt at 70 or 80 degrees. Under this fan, the melted paraffin wax has long been blown away and dust is fused into a greasy state. And cyanide Sodium is naturally hydrolyzed in moist air to produce hydrogen cyanide, and it can be quickly decomposed even if the temperature is above 60 degrees."

"It could be like this!" Wang Liang was a little excited: "Then the murderer entered this room 15 days in advance, then put the wax-sealed sodium cyanide here, and then waited for Xiao himself. Turn on the death button!"

Thinking of this, Wang Liang looked at the power button tremblingly, and muttered: "Unexpectedly, this is actually the death button..."

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

"Sodium cyanide can produce sodium formate, hydrogen cyanide and other substances when it encounters water and carbon dioxide in humid air. Hydrogen cyanide is highly toxic. Several milligrams per cubic meter are dangerous to the human body. It is still humid above 60 degrees. The concentration of hydrogen cyanide will quickly reach a lethal level in an environment where the sodium formate will not continue to decompose at this temperature, so these things should be the remaining potassium formate. The others are blown around by the fan and mixed in the dust. "Bai Song explained: "This is how to kill."

"Inspector Bai, I look at you, it seems that you have a clear mind. Is there anything else to say? Let's say it together." An expert at a higher level looked at Bai Song and said with some interest.

"Hello Sun," Bai Song greeted this man first, and then said: "For now, I think the murderer may be one of the people who stolen the battery of the electric car."

When Bai Song said this conjecture, no one had any surprised expressions, that is, several people had more doubts. Because at the very beginning, many people thought about this issue, but there is no other evidence to support it.

"I will continue," Bai Song cleared his throat: "The reason why we did not find this in the family where the battery was stolen was probably because this household did not call the police. In recent years, except for some people who don't care about electric car batteries, others If you don’t call the police, you probably don’t trust the police. Why should I say that this person did it? Because there are several good conditions for committing crimes.

The first is that Xiao has lost a key. As a new thief, he was likely to fall into the process of stealing and was picked up by the owner; second, the police have visited many communities and asked if No electric car battery was stolen, and the suspect has been captured. Therefore, the person who lost the electric car also learned who the electric car was stolen. There is not much place around here. You may know that Xiao Mou was detained if you ask anyone. Third, the police go to Xiao Mou. If the murderer wants to know where Xiao’s home is, he can find out by following the police that the police station handles a theft case, and he doesn’t care about anything else at all, and it is estimated that he would not pay attention if he was secretly followed. "

"This doesn't make sense, why don't you trust the police? Since 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 is almost inevitable. There is a high probability that a person who can commit a murder such as this kind of behavior, and such a precise behavior, has a big problem in himself, for example, a murderer is on the run, and it is impossible to take the initiative to contact. Police. This is the reverse explanation, I don’t know if you can accept it?” 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. After 15 days, Xiao When a certain goes back, he will close the door and play on the computer, which is basically dead."

"Then why did Xiao run out?" Zhao Detachment asked.

"This belongs to the murderer's calculation error." Bai Song explained: "The murderer thought that Xiao would be quickly poisoned and then die at home. According to Xiao's otaku's nature, someone must know that the corpse is smelly. Once seven days have passed. For eight days, everything in the house was covered up, and the hydrogen cyanide was long gone. If the computer runs for seven or eight days, it is estimated that this sodium formate will not be found. And the high decay scene may be our focus on the corpse~ lightnovelpub.net~ This is winter, and it may take more than ten days to be discovered.

After Xiao showed very uncomfortable feelings such as chest tightness and shortness of breath, he felt a problem, then ran out and up the corridor, but fell there, never got up again, and died of acute cyanide poisoning. In this way, the door is open, so even if there is hydrogen cyanide gas, it will quickly evaporate. When someone finds it in the corridor, that is, a few hours later, the hydrogen cyanide gas is already gone on the spot. "

Zhao Detachment nodded in satisfaction, arranged for someone to collect this milligram-level white powder, and arranged for someone to go to the laboratory overnight tonight.

"Why did you kill someone because of a little thing? I really can't figure it out." Someone asked.

"The suicide case tonight is 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 pierce you. Heaven killed the other party. We don’t see it here. In some areas, there are real homicides that originated from the phrase'what are you looking at'."

"Yes, Inspector Bai's words are reasonable. We don't know what happened to the murderer at the time, but it is estimated that the electric car is very important or delayed in an emergency. In addition to Inspector Bai's words, the murderer may be a fugitive. Murderer or something, so furious, so he designed such a scene. It does not require advanced chemical knowledge, only a clever design." The superior expert nodded affirmatively: "I think this idea makes sense. Now that we have so many people, we might as well check the number of people who have lost their batteries in these communities who have not reported the case."

"Good!" All the teams are gearing up.

In this posture, there is quite a feeling of red and blue confrontation.

(This cup tops two cups, and today’s 10,000 words update is OK)