Detective: Start with capturing and retrieving the dog

Chapter 219 Delayed Ignition Device
The situation was so serious that Han Xin didn't care so much and took Zhao Linshan directly to the Public Security Department.

"Captain Huo, this man's mental state is very dangerous..." Han Xin said breathlessly.

"I know. We consulted a psychological expert and he said this person has severe pyromania." Huo Gang frowned.

Han Xin shook his head: "No, this person is not a pyromaniac."

"Isn't it!?" Huo Gang asked in surprise.

"First of all, we have to make it clear that the purpose of pyromaniacs is just to set fires. Such people are satisfied as long as they see the fire burning. But what about this case?" Han Xin took two deep breaths to calm himself down, "From the point of origin of the fire. It can be seen that the prisoner is obviously targeting 'people', which means that his purpose is not to 'set fire', but to see people being 'burned to death'."

"Hiss..." Huo Gang took a breath, "In other words, this bastard just wants to burn people to death, right?"

Han Xin nodded: "The degree of danger between the two is not at the same level."

"Oh, what kind of expert is this!? He's self-taught, right?" Huo Gang suddenly became angry.

"Ordinary psychology and criminal psychology are completely different concepts." Han Xin explained, "Such criminals usually have serious mental illness or personality defects, and their psychological patterns are often different from ordinary people, and they cannot follow conventional methods. To infer.”

Huo Gang took Han Xin and Zhao Linshan to the office, and then signaled everyone in the office to pay attention to them.

Not only were members of Huo Gang's team present, but Zhong Li and her team were also present.

Huo Gang briefly explained Han Xin's theory, then turned to Han Xin and asked, "Teacher Han, can you explain in detail what the difference between the two is?"

"There is a big difference. The character profiles of the two are completely different." Han Xin replied, "Pyromaniacs are mostly affected by events in their childhood, which leads them to feel satisfied when setting fires. The purpose of this kind of behavior is actually the same as that of normal people eating food, falling in love, and playing games, it is to obtain satisfaction.”

"So?" Zhong Li said thoughtfully, "This kind of person is very dangerous, right?"

"It's not that the risk is very small, but the behavior patterns are completely different." Han Xin shook his head, "Pyromania and antisocial personality are different. The purpose of pyromania and arson is not to destroy or hurt people, but simply to He wants to see the fire. This means that after the fire breaks out, he will definitely be at the scene, watching the flames burning, and sometimes even participating in putting out the fire in order to be close to the flames."

"What about the one you mentioned to burn others to death?" Zhao Linshan asked curiously.

"This kind of person has an antisocial personality or suffers from a mental illness. He is just obsessed with burning to death." Han Xin explained, "It is very likely that he can only obtain sexual satisfaction through specific methods, that is, burning to death." Kill others. The essence of this phenomenon is the murderer’s antisocial personality, and the trigger is that he had witnessed similar situations in his childhood, which left a deep impression on him.”

Therefore, it can be seen from this aspect that the profiles of the two types of people are completely different.The first is due to psychological trauma, while the second is due to congenital defects.

The former may have a documented history of arson, be emotionally unstable, and stay at fire sites for long periods of time.

The latter should have burned insects and animals with fire, so it will not be recorded. His mood is relatively stable, and he will leave the scene as soon as possible after arson.

The difference between the actions of the two is huge.

"Are you saying that he might have witnessed someone being burned to death in his childhood?" Zhong Li asked happily, "This is still a very obvious feature. With this feature, the scope of the murderer has been narrowed a lot. He wanted to see Those people who were burned to death will definitely stay at the scene, and maybe they can help us find this person from the surveillance video at the scene."

"Not necessarily." Han Xin shook his head. "It would be too dangerous for him to stay at the scene and watch those people being burned to death. He may have left some equipment for live broadcast at key locations on the scene, such as in the emergency escape passage. Put a cell phone in it."

"There is generally no monitoring on the emergency escape route, and his actions will not be recorded." Wei Bin echoed, "It sounds reasonable, but how did this guy set the fire?"

"We checked the surveillance and found that there was no one at the scene when the fire broke out. It just caught on fire for no apparent reason." Lu Wenbo explained.

"If that's the case," Han Tuo said to himself, holding his chin, "this person may be using some kind of delayed ignition device."

With that said, Han Xin turned to Huo Gang: "Captain Huo, can you go to the scene and have a look? It's very important. Since the crime occurred in a relatively short period of time, the evidence may not have disappeared. We need to go and have a look quickly. Maybe we can find something. .”

"Of course, let's go." Huo Gang nodded cheerfully, and then waved.

Next, Han Xin followed the police to the point of fire.

The top of the building has been blackened by smoke and the entire building has been fenced off and a safety assessment is being carried out.The three floors were basically burned to the ground, and various losses amounted to tens of millions.

Because the elevator was also affected by the fire, Han Xin could only climb the stairs with the police.

After finally reaching the sixteenth floor, the place was already in a mess, the stairs were burnt black, and there was water and fire-fighting foam everywhere.In such a chaotic situation, it is difficult to find anything from here.However, Han Xin had his target in mind. Now that he knew where the fire started, the search would naturally be much easier.

Turning on the eagle eye sight and taking a glance, Han Xin found two highlights.He came to the corner and looked up. There was something wrong with the ceiling above his head. The surrounding area was burnt black, but only a small circle of white here seemed to have not been burned.

"Captain Huo, can you send someone to check there?" Han Xin pointed to the ceiling, "There may be some surveillance equipment hidden."

"Come a few people, go up and take a look inside!" Huo Gang ordered the people below.

Then Han Xin came to the second highlight and squatted down to check it carefully.He reached out and picked the dust and wall coverings on the ground, and then found a cigarette butt inside.

But this cigarette butt is a little different. It seems to be much thicker than ordinary cigarette butts.Han Xin then took out the tweezers he carried with him from his pocket, carefully picked up the cigarette butt, and observed it carefully. Only then did he realize that the reason why it looked thick was because the cigarette butt was tied with several wooden sticks with a rubber band. Together.

Judging from the thickness of the stick, it should be a match, with only part of the tail remaining.

"This must be a delayed ignition device, but..." Han Xin frowned and looked at this thing, "How does this thing delay ignition? Is it using smoke to light the match? But the fire of the match is too weak, right?"

"Ah, I know!" Zhao Linshan raised her hand excitedly, "Wrap a few matches around the outside of the cigarette, then make the match head shorter than the head of the cigarette, then wrap a circle of paper around the outside, and use an eraser to wrap it around the outside of the cigarette. The tendons tie them together. When the cigarette burns to a certain level, it will light the match wrapped outside, and then the match will light the paper, and it can be used as an ignition device!"

"How do you know? You are not a hidden criminal boss, are you?" Han Xin poked her forehead.

Zhao Linshan rolled her eyes at him: "I'm with you 24 hours a day, you damn criminal! There was an arson case abroad that was done this way. I used this case before when I wrote a novel."

"Okay, you are great." Han Xin touched her head, "You really always know some strange knowledge."

"That's what writing novels is like. If you keep changing the subject, you have to keep learning all kinds of strange knowledge." Zhao Linshan said happily.

However, this way we will know what method the prisoner used to delay the ignition.

However, this cut off their clues, because these things are too common, and the time is difficult to determine. People come and go in this building, and the surveillance does not know who placed this thing.And there was no surveillance over the emergency escape route, so it was even more impossible to know who did it.

"There is nothing we can do. Let's go back and do experiments." Han Xin put the cigarette butt in the bag and handed it to Huo Gang. "We will put the matches and cigarettes in the same position as the evidence and conduct several sets of experiments. It should be able to Find out the time of ignition and narrow down the range of possible murderers. By the way, take this cigarette back for identification, maybe you can find something."

This kind of experiment is a typical application of basic deduction method.

After returning to the Public Security Bureau, Huo Gang and others immediately started the experiment. They placed the matches and cigarettes in the same position, tied them with rubber bands, and then lit them. Five sets of experiments were compared. The final result was 5 minutes. about.

The cigarette itself can burn for about 10 minutes if it spontaneously ignites, and the match will be ignited in about 4 minutes, burning the paper wrapped outside.

Considering that it takes a certain amount of time for the fire to spread, it can be inferred from the monitoring time that the fire on the [-]th floor became larger that the delayed ignition device should have been placed there around seven o'clock.

Through this, they called up surveillance, and settled on a possible inmate.

"Teacher Han." Lu Wenbo hurriedly came over from the technology department, "According to the surveillance, the only people who entered the sixteenth floor from six to seven o'clock were the building cleaners and security guards. But I called I checked the surveillance and checked with the building management and found that there was a cleaner inside who was not from their building, so someone must have been impersonating her."

As he said that, Lu Wenbo showed Han Xin the screen on his mobile phone. The cleaner who passed by on the surveillance camera seemed to be about 30 years old. He pushed a cart full of cleaning supplies into the office, and it took about half an hour. Just came out.

Obviously, this guy is very suspicious.Those bottles filled with cleaning supplies are likely to contain something flammable.

"Then why are you still standing there? Go check on this guy immediately!" Huo Gang ordered.

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