Chapter 428: Hanging a Bell on a Cat's Neck

"How many accumulated explosion cases are there in our Qinghe City?"

Jiang Yuan looked at the photos of the case files on the table and suddenly asked a question.

Perhaps because of the supervision of the Provincial Department, there were many photos left by the Qu'an Station explosion case, and the case files were orderly and detailed. However, the clues they could provide were very few.

Jiang Yuan read it from beginning to end, and didn't filter out any useful information. The first thing he thought of was to use the opportunity of exchange obtained by the second-class merit to get an explosion-related skill back.

Since it is an exchange, he naturally hopes that the application surface of the skill he gets back can be larger, so Jiang Yuan asked this question.

The conference room was full of police officers from Jiang Yuan's accumulated case special class, and everyone was performing their duties, each looking for clues.

Wang Chuanxing and Tang Jia were part-time assistants to Jiang Yuan, and they checked when they heard the words.

"No more. Just this one case." Huang Qiangmin sat at the other end of the conference table, just shrouded in the sun, drowsy, and when he heard Jiang Yuan's question, he answered without thinking.

Jiang Yuan was a little surprised: "Is it just one?"

"Do you think it's a serial explosion case?" Huang Qiangmin suddenly woke up. Jiang Yuan had discovered serial murder cases like this before.

Jiang Yuan shook his head: "That's not it, I'm calculating something else."

One skill for one case. If it were like the last kidnapping case, forced by the situation, he would exchange it if he had to, without too much hesitation. After all, having more skills is not a burden. But as far as now is concerned, whether the killer dies a little earlier or a little later is not in Jiang Yuan's consideration at all. And exchanging a skill like explosion trace detection might not necessarily solve this case.

If it were a current case, perhaps there would be a greater chance. It's an old accumulated case of 8 years, so whether it's exchanging for a LV4 major skill or a LV5 minor skill, the help it can provide is limited.

By comparison...

"Call Liu Chu." Jiang Yuan's voice was not loud, which shocked Huang Qiangmin.

"Do you want to call Liu Jinghui?" Huang Qiangmin was more surprised: "Don't you usually look at photos and solve the case?"

"Director Huang, it's not that easy to solve a case." Jiang Yuan looked at Huang Qiangmin strangely, and the police officers in the special class also looked over with some confusion.

Huang Qiangmin dodged Jiang Yuan's gaze embarrassedly, and couldn't help but reflect: Have I been blowing Jiang Yuan too much recently, and believed it myself first!

To say the least, wanting to sell public people to the public for a public price, there is no lack of rhetoric. Huang Qiangmin's multiple experiences over many days, the best selling point is the 100% case-solving rate, the super fast case-solving speed, and the super low case-solving cost—blowing Jiang Yuan like this too much, Huang Qiangmin believed it himself.

Thinking of this, Huang Qiangmin's expression was much more solemn. Being a criminal policeman, you can't be objective. So he said: "I just think you are more powerful than all the experts in the Provincial Department combined. Using Liu Jinghui... it's not impossible to give him a chance."

"It's better to invite Director Liu. The clues of the case are very few, and there is a lot of evidence. If Director Liu takes a look, maybe he can pull out a few lines."

Too much useless information and too little useful information is the characteristic of this case, and it is also the characteristic of most explosion cases.

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Liu Jinghui is obviously very suitable for this kind of application scenario. By comparison, Jiang Yuan has to scan the evidence one by one, which is still relatively time-consuming.

Huang Qiangmin saw this and nodded: "Okay, it was originally a case that the Provincial Department participated in, so it is appropriate to let them send someone."

He went out to communicate after saying that.

Jiang Yuan continued to look down at the photos, pondering them one by one.

Similar to previous accumulated cases, the key problem of this case lies in the fact that most of the clues were tracked and investigated during the current case period 8 years ago. If they were not discovered then, how can they be investigated now?

On the other hand, the information involved in the case is actually very large, and most of it is useless. 8 years ago, hundreds of criminal police were mobilized here to conduct various investigations, and the investigation was carried out three times.

It was not solved even like this, from which it can also be inferred that the impact of the big case on the case-handling personnel. At least, Jiang Yuan had not heard of the name Qiu Yue.

Liu Jinghui arrived early the next morning.

He came by car wearing a police uniform, with a driver beside him. Like Jiang Yuan, since he encountered danger, he has been less and less alone.

When he arrived, he didn't delay, and read a large amount of case file materials during the car ride. When he arrived at the Qu'an Branch, he looked at the photos for a while and said: "As I thought, the residue of the explosive in this case is the biggest evidence, and it is also the most difficult to find information."

"Do you want to search along the source of the residue? The special case team checked it very carefully back then, and I didn't see any obvious flaws." Jiang Yuan was looking at pictures and reading case files. Today, wanting to directly trace the source of the explosive residue is almost impossible. The most important thing is that it was checked back then and not found. If there is no new idea now, walking the old road again, but expecting to walk to a different ending, that is unrealistic.

Liu Jinghui shook his head: "I don't have any ideas now either. However, the residue of this explosive is actually quite interesting."

"Oh, how to say?"

"Most explosion cases, the detonator is a detonator or a fuse. Our province has many mining enterprises, and these two things... normally speaking, if you can't easily get these things, you won't commit explosion cases." Liu Jinghui has his own set of logic.

Jiang Yuan nodded slightly.

Liu Jinghui said: "But from another perspective, this case was done quite powerfully. The explosive used was black powder, battery detonation. It can be said that everything is relatively easy to buy, but the power is still okay. After 8 years, it is rare to have an explosion case with this level."

"Similarly, after 8 years, the killer has not committed a similar explosion case again. This point is worth delving into."

"The killer's purpose was not achieved at the beginning. Since that is the case, why didn't he re-place the bomb? Or did he explode in another place, or did the killer's purpose change? Or? Did the killer encounter any unexpected situation?"

Jiang Yuan was stunned for a moment. He is not familiar with explosion cases, and as for the types of detonators, he is not very clear. But what Liu Jinghui said makes sense. The killer was not caught. As a quasi-terrorist explosion, why didn't the killer continue to commit crimes?

This was originally the line that the special case team was most worried about. The Provincial Department intervened in the first time to avoid this situation.

In fact, because the killer does not need to participate directly, the probability of continuous occurrence of explosion cases is originally very high. For example, Hu, who once manufactured three explosion cases because his girlfriend broke up and took away 20,000 yuan, and had nowhere to ask for it, in order to gain attention...

What was the purpose of the killer of the Qu'an Station explosion case? And did he achieve his goal?

"Time is our biggest disadvantage relative to the special case team, and it is also our biggest advantage." Liu Jinghui combed his big back, the collar of his shirt was clean, his image and temperament were standard, and his expression was very confident.

"If everyone has no ideas, I suggest starting from the periphery and doing some investigation work first." Liu Jinghui said he had no ideas, actually he had ideas, but his idea was a bit like scratching an itch through a boot.

After all, if you want to blindly guess the killer's intention, sometimes thoughts are really hard to guess. Still using the mastermind of the three explosions, Hu, as an example, his real purpose might be that he was just not smooth, wanted to vent, or he just wanted to ask for an explanation from his ex-girlfriend, but these are all inner dramas belonging to him alone. The truth that the police can trace is: he manufactured three explosion cases because his ex-girlfriend took away 20,000 yuan.

Who can guess this kind of answer?

A few people looked at each other and felt that the difficulty was quite large.

Huang Qiangmin couldn't help but sigh and said: "A mouse hangs a bell on a cat."

This is his evaluation of Liu Jinghui's reasoning. The reasoning is good, but how to execute it?

Liu Jinghui laughed "hehe" twice and didn't care about Huang Qiangmin's evaluation. These laymen understand what reasoning is. Reasoning also requires information, step-by-step reasoning, step-by-step advancement, step-by-step acquisition of information, and then reasoning again, forming a positive feedback loop, and finally getting the correct result.

Even if it is really a task of letting a mouse hang a bell on a cat, it is not impossible to complete. There are always ways. Decomposing this task can be pre-setting traps, or multiple mice attacking, or night operations, etc...

Of course, if some mice are particularly outstanding and really hang the bell on the cat...

Liu Jinghui looked at Jiang Yuan with expectation and said: "I'll do some reasoning, you see which one is suitable for a breakthrough point?"

"It's best to have something real." Jiang Yuan said.

Liu Jinghui smiled, pondered slightly, and said: "I'll say a few possibilities first. The first is about the killer. The killer suddenly stopped committing crimes. The most common situation is that freedom is restricted, the environment is restricted, or life and emotions have changed."

"If it is the first point, we can check the list of personnel arrested and detained within 2 years of the killer's crime. Secondly, we can check the list of deaths and serious injuries, including those who were seriously ill during this period, those who had traffic accidents, especially accidental deaths, especially mining enterprises, people with corresponding background capabilities..."

"The second, environmental problems, the killer is likely to have gone abroad and left the local area. It is also possible that he was discovered by people around him—this point cannot be verified, but I think, if it is this situation, we should look for more passive factors. For example, further education, studying abroad, being sent to other places on business, or being admitted to civil service, or being hired to a company position in other places."

"The third, in terms of life, did he fall in love during this period? Got married? Had children? Or divorced, broke up, children or family members were ill, he had a sudden illness... Also, promoted and raised salary, won the lottery, sudden wealth..."

Huang Qiangmin and others' expressions were okay at first. For example, criminals who were imprisoned for other crimes instead avoided screening or investigation, which happened from time to time. I don't know how many times I have seen it in police reports. This kind of thing is also relatively easy to check. The time and name are very certain, and it is just a matter of spending time to screen.

But in the ears of Huang Qiangmin and others, Liu Jinghui has a tendency to say more and more excessively. If things like further education and studying abroad have to be checked, even if Qu'an is a small place, it is a vast amount of work.

In the end, even promotion and salary increase count. How much salary increase counts? Does fifty yuan count?

The scope is expanded so large, Huang Qiangmin feels that Liu Jinghui wants to touch everyone in Qu'an County.

If so, finding Liu Jinghui is not as good as finding Xu Taining.

Liu Jinghui also felt that there were too many bells tied to the cat's neck. He touched his neck and pondered: "Then let's check from two directions first. One is the list of criminal personnel, the time can be extended, and crimes within 2 years of the killer's crime are counted. The other is that we compare other explosion cases in various places, including similar ones, and unfinished ones."

Huang Qiangmin nodded slowly when he heard it.

The captain of the criminal police brigade in Qu'an County also agreed: "Director Liu still has a level."

These two points are parts that the special case team back then could not investigate.

Although the personnel sent by the Provincial Department back then were as urgent as fire, after three or four months of investigation, the large-scale investigation almost stalled. On the one hand, the clues had been checked and there was no result. On the other hand, the risk of serial explosions was also decreasing.

However, decreasing does not mean there is none. The killer of some explosion cases, his concept of time is different from the killer of ordinary cases. He may spend months, or even a year or two, to improve explosives, modify and perfect his plan.

Therefore, people who accidentally lost the ability to commit crimes during this period belong to the scope of suspicion, and the special case team has not investigated them.

And explosion cases or attempted explosion cases in other provinces may also be committed by the same killer, which can also explain why he did not continue to commit crimes.

Compared to other messy guesses, the two directions proposed by Liu Jinghui belong to a limited and controllable range, and the cost of investigation will not be too high, which is exactly the type that criminal police captains like. ===== CHAPTER 429 =====