Chapter 546

The various units that participated in the Jingyang Line triple homicide case were all silently reviewing the case.

The Changyang City Criminal Investigation Detachment was originally the most hopeful to solve this case, but their focus was wrong. Their main investigation direction was the first victim, and they were desperately looking for the relationship between the two victims.

However, the killer's choice of the first victim was completely random. Therefore, this case became a very difficult random murder case. It was a random murder case without any rape, which made the case even more difficult.

Even when the special task force restarted the case later, they considered the scenario of a random murder case, but they only faced an even more difficult situation.

The situation in the Huo City Bureau and Qingbai City Bureau sections was similar; their manpower and resources simply could not withstand such a long-term case investigation.

Even if Jiang Yuan had a mature plan to give them, it would be difficult for the two to merge and push the case forward.

Wang Shikai's "learning spirit" completely misled the direction of the case investigation.

Normally, murder cases have several common investigation directions, such as those for money, for sex, or purely perverted serial killer-style random cases. Not just murder cases, but for all types of cases, the police usually choose to make a breakthrough from the modus operandi.

For example, someone who commits robbery with a knife will commit robbery with a knife next time; someone who smashes the back of someone's head with a hammer to rob them will use the same hammer next time, and the position they smash won't be much different; a rapist who uses ether won't choose other drugs next time...

The "hand-chopping gang" will always chop hands; a "white-entry" thief won't climb walls, and a thief who climbs walls won't pick locks... Old criminal police officers sometimes look at the scene and can directly call out the perpetrator's ID number; that is the logic.

To describe it with more high-end modern vocabulary, this is called path dependence. A robber who has had successful experience will use the successful method to rob next time. Perhaps there will be a little upgrade or modification, but the basic appearance won't change much.

In matters of crime, ordinary people still choose to be safe. The risks of innovation are too great. Most serial cases are exposed precisely because the perpetrator violates their own established patterns.

However, in the Jingyang Line triple homicide, Wang Shikai's modus operandi was completely different. The transportation method might have been similar, but because he changed three cities, he was forced to change his transportation means in the face of the different scenes in the three places.

Secondly, in the common list of criminal motives, Wang Shikai's criminal motives were also different.

In the first case, his purpose was learning; in the second case, he was a premeditated murderer; in the third case, he was trying to confuse the police and escape punishment.

Therefore, when choosing targets, Wang Shikai's choices were also different.

In the first case, he chose the easiest target to kill. Moreover, Wang Shikai, who was killing for the first time, was hesitant and had the factor of waiting for an opportunity, and the so-called opportunity was equivalent to sufficiently reducing his exposure.

In the second case, Liu Limin, the victim, was the target Wang Shikai was premeditated to kill. Therefore, he did not screen the target, but instead used the experience of the first murder to make the two cases similar yet different.

In the third case, Wang Shikai just wanted to confuse the police's attention. Therefore, with the experience of the previous two times, he improved his criminal methods, optimized his target selection, and finally changed locations to commit the crime...

By the end of the entire series of cases, the most likely way to catch Wang Shikai should have been DNA. Domestic DNA testing only began to be promoted in 2003, basically limited to the provincial level. Of course, the time for using DNA to solve cases was very early—the first one was in 1987—but that was an era without test kits, and there wasn't even a standard DNA laboratory. Not to mention the time required to compare a single DNA sample, the cost would be several thousand or more.

Most importantly, domestic DNA databases only started to exist around 2003, and the large-scale use of DNA to solve cold cases also started from this time. It was only after this that the Ministry dared to shout the slogan "Every murder case must be solved."

However, Wang Shikai used a bug that very few people knew about with explosive luck. That is, the DNA pollution on the railway was actually very serious. In the era of green-skinned trains, passenger cars usually didn't have black water tanks, which meant that the endless stream of passengers using the toilet were actually leaving feces on the train tracks.

A piece of trivia: because trains travel at high speeds, the fallen feces were basically in a wind-dried state and scattered on both sides of the tracks.

When the train hit a human body at high speed at a location carefully chosen by Wang Shikai, the scattered human tissue was essentially in a state of pollution from the moment it hit the ground.

On the other hand, while criminals in those years rarely paid attention to DNA issues, the police officers in charge of the case didn't notice it either. Therefore, when the police asked railway personnel to help pick up the fragmented corpses, there was almost no DNA available for identification.

As for what was stuck to the train, it would naturally be washed away by the time it reached the station ahead. The Railway Bureau only reported the case after it happened, but the train wouldn't stop there and wait. By the time the criminal police discovered it was a series of cases, the previous train might have already hit some small animal.

In the end, this case was solved bit by bit.

Liu Jinghui's judgment, Xu Taining's investigation, and Jiang Yuan's pinpoint explosion all played a huge role. It couldn't be said that without any one of them, the case couldn't have been solved, but the time and energy spent would certainly have been more than doubled, perhaps even tenfold.

When the review reached this point, the comrades from the municipal bureaus, the provincial department, and the Ministry all gave up.

There are many things in the world that cannot be replicated; there is no need to force it.

Moreover, Jiang Yuan was originally clearly priced, but now he has become more expensive.

The case was wrapped up, and it took a few more days.

On the morning of seeing Jiang Yuan off for his return journey, representatives from the Changyang Municipal Bureau, Huo City Bureau, Qingbai City Bureau, as well as the Provincial Department and the Ministry, all appeared actively.

Everyone gathered at the high-speed railway station, and the feeling of parting was as thick as blood.

"If you're not happy staying in the county, just come to Changyang City for a while. You can work on cases or just rest for a while. Anyway, you bought a house, and if you want to go home, it's just a matter of lifting your feet." Yu Wenshu had clearly heard some rumors and invited Jiang Yuan with a deliberately solemn face, though he didn't know if he was laughing his head off inside.

Jiang Yuan thanked him and said: "I'm used to living in the village and am not quite accustomed to big cities. Once I've sorted out things in the county, I'll come to Changyang to continue working on cases."

"En, that works too." Yu Wenshu patted Jiang Yuan on the shoulder, leaned in close, and whispered: "If you need help, just say so."

If Jiang Yuan didn't make a request, he clearly wouldn't intervene on his own initiative.

Jiang Yuan nodded in thanks, then was pulled into a hug by the detachment leader of the Huo City Bureau next to him, followed by a deputy director from the Qingbai City Bureau.

Huang Qiangmin used a lot of strength to snatch Jiang Yuan back.

Immediately after, the detachment leader of the Huo City Bureau hugged Huang Qiangmin and started chatting in detail.

Huang Qiangmin first bared his teeth at 44.4 degrees, and as the Huo City Bureau made their offer, it gradually turned into 66.6 degrees.

"I don't have an opening in my schedule recently; let's talk in detail later." Huang Qiangmin pushed the chest of the Huo City Bureau detachment leader and left firmly.

The Huo City Bureau detachment leader returned a smile.

After a round of socializing, everyone's excited emotions gradually calmed down. Then they heard the prosecutor who came to see them off say: "From the current evidence, there isn't much of a problem with Wang Shikai. As for his brother, it's difficult to convict him. Moreover, from what we understand so far, at least at the time of the incident, his brother likely didn't know. He might have had suspicions afterward, but it shouldn't be certain."

"He took someone else's house." The detachment leader of the Huo City Bureau next to him was very concerned about this matter.

"The Wang family is willing to pay it back, plus the rent for these years." The prosecutor paused and added: "Wang Shikai specifically chose the time his brother was having surgery to commit the murder. There is no element of instigation here. After Wang Shiji was discharged from the hospital and learned the news of his girlfriend's death, it was also Wang Shikai who persuaded him to stay calm to avoid becoming a criminal suspect..."

"That's all according to Wang Shikai." The detachment leader of the Huo City Bureau said.

The prosecutor said: "It makes sense and is consistent with common sense. There is also the issue of corpse transport. Wang Shikai is 1.83 meters tall and has a strong build. The three victims he chose were all women weighing under 100 jin. He had the ability to transport them independently. When we identified the scene, we also had him demonstrate, and there were no problems. Most importantly, he used a tricycle as a means of transport, and carrying a big guy who is 1.8 meters tall would have more disadvantages than advantages."

His explanation was also for the police officers from other units, including Jiang Yuan and the others. If it were an ordinary small case, the prosecutor would decide how to prosecute in one word. Only for such major and important cases would he need to communicate slightly.

Jiang Yuan and the others just listened without speaking.

From a certain perspective, Wang Shiji was actually a victim. Although he accepted the woman's house, both parties were dating with the intention of marriage, and the purpose of buying the house was also to persuade the man's parents to achieve their common goal. Therefore, at that time, he could be said to have lost his love painfully.

It's just that regarding the subsequent property issue, Wang Shiji half-pushed and half-accepted the house, which is a big stain.

A bigger stain lies in the fact that the killer was Wang Shikai. As a brother, it is very difficult for Wang Shiji to completely clear his name.

It's just that the law doesn't punish moral issues.

Just like Director Chai Tong, the methods he adopted were not noble, but they were legal and compliant.

Amidst the farewells, Huang Qiangmin, Jiang Yuan, Mu Zhiyang, Wu Junhao, and his "Bald-Strike" team boarded the high-speed train and drove back to Ningtai County.

Wan Baoming, who hadn't spoken the whole time, was waving his phone desperately, showing his WeChat to Jiang Yuan.

Jiang Yuan opened WeChat and saw that Wan Baoming had posted a new Moments update:

Colleagues part with heavy hearts, past events surge like tides in the heart.

Times of working together are unforgettable, team spirit remains for a long time.

Busy work is tightly linked, rare leisure time for chatting and laughing.

Life is short with many gatherings and partings, wishing for joy and freedom after this parting.

May the bright moon always accompany, lighting up the dreams in the distance.

The journey together is not yet over, wishing for a smooth path ahead.

Do not say there are no soulmates on the road ahead, who in the world does not know you.