Chapter 428: Hanging a Bell on a Cat

"How many cold cases of explosion 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, but 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 exchange opportunity obtained from the Second-Class Merit to get a skill in the field of explosion.

Since it was an exchange, he naturally hoped that the skill's application surface could be larger, so Jiang Yuan asked this.

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

Wang Wang Chuan and Tang Jia were part-time assistants to Jiang Yuan, and they checked when they heard this.

"None. Just this one case." Huang Huang Qiangmin sat at the other end of the conference table, just shrouded in sunlight, drowsy, and when he heard Jiang Yuan's question, he answered without thinking.

Jiang Yuan was a bit surprised: "Just one?"

"Do you think it's a serial explosion case?" Huang 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 kidnapping case last time, forced by the situation, he would exchange it if he had to, without too much hesitation. After all, more skills don't weigh you down. 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 for 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 cold case from 8 years ago. Whether it's exchanging for a major LV4 skill or a minor LV5 skill, the help it can provide is limited.

By comparison...

"Call Liu Chu (Liu Liu Jinghui)." Jiang Yuan's voice was not loud, but it shocked Huang Huang Qiangmin.

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

"Director Huang, solving a case is not that easy." Jiang Yuan looked at Huang Huang Qiangmin strangely, and the police officers of the special team also looked over with some confusion.

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

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

Thinking of this, Huang Huang Qiangmin's expression became much more solemn. As a criminal police officer, you can't lose objectivity. So he said: "I just think you are more powerful than all the experts from the Provincial Department combined. Using Liu Liu Jinghui... it's not impossible to give him a chance."

"Still, please invite Liu Chu over. There are very few clues to the case, and there are many evidences. Liu Chu can take a look, maybe he can pull out a few lines."

Too much useless information and too little useful information are the characteristics of this case, and also the characteristics of most explosion cases.

【Novel app that has been running stably for many years, comparable to the old version of the source-changing app, huanyuanapp.】

Liu Liu Jinghui was obviously very suitable for this type of application scenario. By comparison, Jiang Yuan had to scan the evidence one by one, which was relatively time-consuming.

Seeing this, Huang Huang Qiangmin nodded: "Fine, it was a case that the Provincial Department participated in anyway, so it's appropriate to let them send someone."

After he finished speaking, he went out to communicate.

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

Similar to previous cold 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 weren't 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 officers were mobilized here to conduct various investigations, and the investigation was carried out three times.

Even so, the case wasn't solved, which also allows one to infer the impact of a big case being expensive but not solved on the case-handling personnel. At least, Jiang Yuan hadn't heard of the name Qiu Yue.

Liu Liu Jinghui arrived early the next morning.

He came by car in his police uniform, with a driver by his side. Similar to Jiang Yuan, since encountering danger, he had been traveling alone less and less.

When he arrived, he didn't waste any time. During the car ride, he read a large amount of case file materials. When he arrived at Qu'an Branch Bureau, he looked at the photos for a while and said: "Just as I thought, the residue of the explosive is the biggest evidence of this case, and it is also the hardest 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 looked at the pictures and read the 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, is unrealistic.

Liu 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 so?"

"Most explosion cases generally use detonators or fuses as detonators. There are many mining enterprises in our province, and these two things... normally speaking, if you can't easily obtain these things, you won't commit explosion cases." Liu Liu Jinghui had his own set of logic.

Jiang Yuan nodded slightly.

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

"Similarly, 8 years later, the killer hasn't committed a similar explosion case again. This point is worth delving into."

"The killer's original purpose was not achieved. The victim triggered the explosive in advance. If so, why didn't he re-place the bomb? Or did he explode it elsewhere, or did the killer's purpose change? Or? Did the killer encounter any unexpected situation?"

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

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

In fact, because the killer doesn't need to participate directly, the probability of continuous occurrence of explosion cases is originally very high. For example, there was a Hu who, because his girlfriend broke up and took away 20,000 yuan, and had nowhere to ask for it, continuously manufactured three explosion cases to gain attention...

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

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

"If everyone has no ideas, I suggest starting from the periphery and doing some investigation work first." Liu Liu Jinghui said he had no ideas, actually, he had ideas, but this idea of his was a bit like scratching an itch through a boot. After all, you want to blindly guess the killer's intention, but things like ideas are sometimes really hard to guess. Still using the three-explosion mastermind Hu as an example, his real purpose might be that he was just unhappy and wanted to vent, or he just wanted to ask for an explanation from his ex-girlfriend, but these were all inner dramas unique to him. The truth the police could trace was: he manufactured three explosion cases because his ex-girlfriend took away 20,000 yuan.

Who could guess this kind of answer?

Several people looked at each other and felt that the difficulty was quite great.

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

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

Liu Liu Jinghui laughed "Hehe" twice and didn't care about Huang Huang Qiangmin's evaluation. What do these Muggles know about reasoning? 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 obtaining the correct result.

Even if it is really letting a mouse hang a bell on a cat, it is not an impossible task. There is always a way. Decomposing this task can be 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 Liu Jinghui looked at Jiang Yuan with full expectation and said: "I'll make some reasoning, you see which one is suitable as a breakthrough point?"

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

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

"If it's the first point, we can check the list of personnel arrested and detained within 2 years of the 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 in mining enterprises, people with corresponding background capabilities..."

"The second, environmental problem, 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 this is the case, we should look for more passive factors. For example, further education, studying abroad, being sent to other places for business trips, or being admitted to civil service or teaching positions, and being hired to positions in companies in other places."

"The third, life aspect, during this period, fell in love? Got married? Had children? Or divorced, broke up, children or family members got sick, had a sudden illness... Also, promoted and salary increased, won the lottery, had a sudden windfall..."

Huang Huang Qiangmin and the others' expressions were okay at first. For example, criminals who were imprisoned for other crimes, but escaped screening or investigation, occurred from time to time. They didn't know how many they had seen in the police reports. This kind of thing was relatively easy to check, the time and name were very certain, and it was just a matter of spending time to screen.

But as they listened, Huang Huang Qiangmin felt that Liu Liu Jinghui was becoming more and more excessive. If even things like further education and studying abroad had to be checked, even if Qu'an was a small place, it was still a vast amount of work.

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

With the scope expanded so much, Huang Huang Qiangmin felt that Liu Liu Jinghui wanted to touch everyone in Qu'an County.

If it were like this, finding Liu Liu Jinghui would be better than finding Xu Xu Taining.

Liu 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 start checking from two directions. One is the list of criminal personnel. The time can be extended a bit. Crimes within 2 years of the killer's crime all count. Another one, let's compare with other explosion cases in other places, including similar ones, and unfinished ones."

Huang Huang Qiangmin nodded slowly when he heard this.

The criminal police captain of Qu'an County also agreed: "Liu Chu still has a level."

These two points were parts that the special case team back then had no way to investigate.

Although the personnel sent by the Provincial Department back then were as urgent as fire, after three or four months of investigation, large-scale investigation almost stalled. On 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 doesn't mean there is none. The killer of some explosion cases, his concept of time is different from the killer of ordinary cases. He might spend months, or even a year or two, to improve the explosive, modify and perfect his plan.

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

And explosion cases or attempted explosion cases in other provinces might also be committed by the same killer, which can also explain why he didn't continue to commit crimes.

Compared to other messy guesses, the two directions proposed by Liu Liu Jinghui both 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 =====

Compared to other messy and chaotic speculations, the two directions Liu Liu Jinghui proposed both fell within a limited and controllable scope, and the cost of investigating them wouldn't be too high; they were exactly the type that criminal police captains liked.