Chapter 430: Upgrade

"If we do it as an ordinary murder case, is the murder target the victim?" Captain Han asked a sentence, still cooperating with Liu Jinghui to hold the gag, and at the same time, he asked a key question.

If the murder target is the victim, then there must be a motive. If not... then who is it.

This question is actually not easy to answer. Liu Jinghui recalled the case files he had read, pondered and said: "The victim is a local, 30-something, who opened a motorcycle repair shop by himself. The business is okay. There is only a cousin in the shop to help. The wife brings the children, and occasionally comes to help collect money and organize the shop. All indicate that he did not offend anyone."

Captain Han listened silently. Just from this paragraph, it can be seen that when Liu Jinghui said "exclude everything impossible," he was really not talking nonsense because he was in a hurry. He had indeed considered this issue.

If the victim is the target, then everything is well explained. The killer achieved his goal, so naturally, there is no need to continue the explosion. The explosive was placed at the station, which was also the only way from the motorcycle repair shop to the victim's home.

Liu Jinghui listed several possibilities, and said: "The investigation in the past few days also proved that there have been no similar explosions in the past few years, and the same gunpowder has not appeared again, which can corroborate the point that the killer's purpose was achieved."

Liu Jinghui said a little excitedly, and Captain Han's face could not see any emotion.

"Old Han, what do you say?" Liu Jinghui needed some feedback.

Captain Han said slowly: "If the victim is the target, it has actually been investigated, and there is no motive. The victim's wife has no relevant technical background, the relationship between the two is harmonious, and there is no impulse to kill her husband in economic terms. The two also had children for less than two years at that time. The victim's cousin is also like this. He was originally learning technology, and he would be out of the apprenticeship in half a year. This time he returned to the countryside and had to start over."

"What about the motorcycle shop itself?"

"The motorcycle shop 8 years ago is not the motorcycle shop 18 years ago. He was just a small workshop, mainly repairing cars, earning hard money and manual money. After the victim's motorcycle shop closed, it closed. The landlord also suffered a loss. The house was rented for a long time before it was rented out, and no similar shop was opened nearby."

"Maybe it's opening a car repair shop." Mu Zhiyang said.

"That's right, opening a car repair shop actually doesn't cost much more than a motorcycle repair shop."

"Maybe it's a deeper emotion." Liu Jinghui guessed.

Emotion and interest are the easiest to produce disputes, and also the easiest factors to manufacture homicide cases. A cold knowledge, although modern people always feel that human feelings are indifferent and the world looks at money, but with economic development and the increase in per capita income, the main reason for Chinese people to kill has long shifted from seeking wealth to emotional entanglement.

At least in terms of killing, everyone still values feelings and righteousness more than money, so-called having feelings and righteousness.

Captain Han looked at the a4 paper list at hand. Now there is no direction, so he can only follow Liu Jinghui's guess. However...

"Do you want to investigate along the motive?" Captain Han asked: "Actually, it has been checked carefully once. Including the victim's relationship in Qu'an County, the relationship in the old home in the countryside..."

"I think it can be like this." Liu Jinghui's gaze looked at Jiang Yuan, saying: "If we collect the footprints of all the victim's interpersonal relationships, can we compare them with the footprints at the scene?"

Jiang Yuan nodded without hesitation: "That's no problem."

This is not too difficult. The only problem is that there are too many footprints at the scene.

However, Jiang Yuan also immediately understood Liu Jinghui's thinking. Explosion cases are different from ordinary passionate homicide cases. They are carefully arranged.

Therefore, the time the killer stayed near the explosion scene is definitely not short, and leaving footprints is very possible. Even if he wears foot covers, etc., it can still be seen easily—of course, there are no such obvious camouflage footprints at the scene, but if you comb through all the footprints at the scene, considering the radius of 20 meters from the explosion center, it is a bus station with people coming and going

, the number of footprints involved is estimated to be very large, but it is indeed one of the feasible choices. Not to mention there are objects for comparison.

Of course, this kind of many-to-many footprint comparison is still very challenging.

The previous special case team did not adopt this plan, and it is estimated that it was also impossible to achieve. Many-to-one is relatively easy to do, many-to-many, very many-to-very many, it is a bit difficult to ensure the success rate, even for Jiang Yuan, it is the same.

The footprint identification of lv3, it is estimated that it is not enough. 【430-

At this moment, Jiang Yuan thought of the second-class merit he had just received.

Jiang Yuan felt it was pointless to trade a second-class merit for an explosion-related skill; he encountered such cases too rarely, and even if he traveled across the country, he would likely clash with various experts.

But the footprint skill was different.

Jiang Yuan summoned the system and upgraded his footprint analysis skill on the spot—Footprint Analysis (lv5).

Because it was a relatively niche sub-category, the level he reached was very high. At lv5, it was no longer just first-class; it was at least at the national top-tier level, which very few people could likely achieve.

Jiang Yuan upgraded this skill without the slightest burden. He used footprints too often; even if he couldn't use it for this case, upgrading it wouldn't be a waste.

"I need to find a few more computers, monitors..." Jiang Yuan had never done this scale of many-to-many comparison before, so he also tentatively made his request.

Captain Han naturally agreed with all his might; since the meat had already been fed, there was no need to be stingy about serving a bowl of soup.

Liu Jinghui was a bit happy; this was an important moment to verify his own line of reasoning. The so-called "there is only one truth" deduction had, in fact, rarely been realized in his career.

Most criminals were finished without needing this trick. The stories imagined by mystery writers were mostly built on perfect premises, but in reality, unless a case was particularly simple, the more complex the case, the greater the possibility of leaving traces behind.

Like the current case, this line of reasoning could also be used to analyze it.

If it were a bombing targeting an unspecified number of people, the killer could just drop the explosive and leave. This case was an anti-social bombing that utilized a sophisticated explosive but was executed crudely.

But if it were converted into a murder case, this case would become a sophisticated explosive murder case that utilized sophisticated explosives and calculated the timing precisely.

In this way, the time the killer spent in the vicinity would not be short. It was basically impossible for them to arrive, drop the explosive, and leave; they would have to calculate, and perhaps even wait and observe in advance.

The four of them seemed a bit more energized. Captain Han immediately picked up the phone, his eyes bloodshot as he began arranging for people to send over more computers and monitors, and of course, the personnel who could install them.

By 9 o'clock, a conference room next door had been cleared out, and a vast number of monitors, as well as computers and printers, had been installed.

"Keep a few people who know computers, then organize these footprints, number them, and absolutely do not leave any out." Jiang Yuan also brought over the members of his own team.

Wang Chuanxing and the others were all highly educated young criminal police officers. At this moment, they gathered together and began to lay out the footprints retrieved from the scene.

The special task force during the current case period had already organized the footprints once. The footprints that could be used for identification numbered in the dozens, belonging to over 4,000 people.

Among them were footprints within the blast radius, footprints on the outer circle of the blast area, and some relatively clear footprints at the station's entrance and exit.

As for the footprints of the victim's relatives, they had collected a few at the time, mainly those of the victim himself, the victim's wife, the younger brother who helped out, as well as several of the victim's own immediate family members, a few neighbors in the village, and a few well-known village thugs.

The special task force at the time, limited by technical reasons, was essentially doing a few-to-many comparison, with a line of reasoning similar to Liu Jinghui's.

This showed that the special task force at the time also had the idea of "belling the cat," but the probability was that the mouse's ability to execute the work was insufficient.

Jiang Yuan's lv5 skill, placed in the mouse world, would have to be at the innate mouse level.

Belling the cat is certainly difficult, but

it is not entirely impossible.

Captain Han even specifically sent a team of people to collect the footprints of various relatives, friends, and stakeholders around the victim.

Come to think of it, these criminal police officers were actually laymen. Footprints are different from fingerprints; they change as a person changes. There are parts that don't change, but there are more parts that do.

But since they didn't understand, they wouldn't ask too many questions.

Jiang Yuan was an expert, but having just attained the lv5 skill, he was in a time of great confidence and felt quite sure he could identify footprints from eight years ago.

Vaguely, the matter of having a mouse bell the cat was almost turning into having a mouse impregnate the cat, but since the executing mouse didn't make a sound, the other mice naturally had no way of knowing.

Two more busy days passed. Just as Jiang Yuan had adapted to his lv5 footprint analysis, a senior police officer from the provincial bureau quietly arrived in Qu'an County.

Qiu Yue—the very person in charge of the previous special task force for the Qu'an Station bombing case.