Chapter 157 The Murder Weapon

Ningtai County's commercial street was built in the image of Nanjing Road.

Of course, the prosperity and scale of the two are not proportional, but the leaders' sincere heart is worthy of praise.

In general, the most central commercial street in Ningtai County is to seal up an original road, open the shops on both sides, and demolish several buildings for business to expand the commercial space.

At the same time, there are small alleys and crossroads in the middle of the commercial street, which gather and disperse the crowd.

Before online shopping became popular in the county, the commercial street was not inferior to the provincial capital Changyang City in terms of population density.

The discount store that Jiang Yuan and others found was at the corner of a small alley and the commercial street.

And it was a surveillance blind spot.

"This person has a thorough understanding of surveillance." Wen Ming frowned when he left the police station.

He has been a criminal policeman for several years and has never seen such a difficult criminal.

Before this, the problems he encountered were more legal and procedural, and sometimes they came from the victim's family or the troubles of his superiors.

This time, the criminal gave Wen Ming a completely different feeling. It was a bit like taking a lure to go fishing in the wild. You think there are black fish in this pond, so you bait it, drag a fake frog, and do all kinds of reptile-like movements, but you don't know whether there are black fish in the pond before you take the bait.

Jiang Yuan comforted Wen Ming, who had more years of service, and said, "At least the shoe sample has been obtained. You can go back and check other surveillance to see if there is anyone wearing this shoe."

The two discount store clerks also described the appearance of the murderer, but compared to the middle-aged man with a common face, when they used words to describe it, it was really ordinary and common, and it was difficult to use it as a basis for arrest.

Although Huang Qiangmin has applied to his superiors for a portrait artist, no one has hope for this.

There are currently only two portrait artists in Shannan Province, and the workload is gradually decreasing.

The problem with portraits is not whether they look like the suspect, but that it is difficult to find the murderer through portraits. They are mostly used for reverse identification. That is, after catching the suspect, they can compare the portraits.

But in the case of eyewitnesses, this model is really a waste of time.

Some units even think that portraits interfere with investigations...

Let's take the example of Baiyin Eucalyptus -

The reason why this case is famous nationwide is that it used all kinds of criminal investigation methods, but all kinds of criminal investigation methods were useless. It has fingerprints, but the fingerprints did not match; it has DNA, and DNA was taken from all men in the city, but it still did not match; it even has portraits, and after catching the person, the portraits are quite similar, but it still did not match during the investigation stage.

After the case was finally solved, 5 people in Su Province alone were awarded first-class merit, 12 second-class merit, 19 third-class merit, and 24 commendations.

Some police officers can say that their lifelong efforts have been spent on this case.

Perhaps someone would say that in the movies and TV series of the free beacon country, there are always awesome portrait artists.

Because it is an immigrant country.

The appearance of immigrant countries is highly distinguishable, so it is easier for portrait artists to grasp the characteristics.

In many small places, a gene expression may really be just one person. For example, a round face, small eyes, a flat nose, or black hair, search the whole town, maybe there is only one person, not many more.

In some countries with orderly inheritance and relatively sufficient genetic integration, the work of portrait artists is not so easy.

Moreover, if they are not trained in the early stage, when the professional level of portrait artists gradually improves, the cameras across the country will be rolled out faster.

In contrast, in the free beacon country, everyone is unwilling to give up the right to privacy to the government, and the installation of cameras is really limited.

Due to different national conditions, the police's operating methods are also very different.

Out of respect for the case, Huang Qiangmin invited the provincial portrait artist to come.

But the focus of the work is still to scan the surveillance.

More than a dozen people were circled out and began to scan the surveillance in the imaging office.

The surveillance around the commercial street and the surveillance around Wanghe Building are all in one area, but the surveillance of many days and the surveillance of different departments add up to a huge number.

That is to say, it involves a murder case. Otherwise, without the image detection department, it would be extremely difficult and burdensome to integrate these surveillance videos.

With the image detection team, the main benefit is that the use rights of the surveillance of various departments can be merged, reducing a lot of unnecessary internal friction.

As for work such as image enhancement, image detection departments outside the provincial capital do not pursue it.

It is impossible to hire people, and even if they are hired, they cannot be retained.

Jiang Yuan searched the footprint database through the shoe sole pattern again, but did not get any results. It means that the suspect really bought a new set of clothes in the store to commit the crime.

This also indirectly indicates that the suspect is very purposeful and premeditated the crime.

So, according to the traditional model, the old criminal police who followed the line of grievances and hatreds to explore the interpersonal network became excited.

There must be a reason for you to premeditate the crime, which means there is a motive.

If we can find the motive, or find the person with whom he had conflicts, then we can find the murderer.

The deceased was still a young man with few social contacts, and even if we count the people with whom he had family conflicts, there were not many.

Several veteran detectives set out immediately.

Jiang Yuan was not optimistic about this.

The reason is clear. Although it was a premeditated crime, people who want to kill people because of grudges and hatred are just ordinary people.

The suspect this time is not ordinary.

At least, he knows how to avoid surveillance.

This skill is not difficult, but it must have been learned. Moreover, it is not just a simple learning, but also needs to be practiced.

The surveillance cameras on the street are basically not hidden, but are placed there in plain sight. Even so, ordinary people or first-time criminals cannot avoid them all.

Even the surveillance of Wanghe Building, the murderer avoided the gate and the lobby, and it is estimated that he entered through the employee passage.

Without surveillance video, there is no image enhancement.

There are no footprints or fingerprints.

Jiang Yuan took out the autopsy photos taken by his master and looked at them several times, but there was nothing to gain.

After a few days, some people have begun to question whether it was homicide or suicide.

At this time, the first batch of trace evidence sent to Changyang City was sent back.

Not only Jiang Yuan, but also half of the technicians of the Criminal Division Squadron came over to study.

Trace evidence often proves the existence of a certain substance. As for its meaning, it still needs everyone to analyze and study it by themselves.

Each trace evidence test report is sealed in a kraft paper bag.

There are only a few pages of paper in it, in the size of A4 paper, with tables, data and analysis conclusions.

Jiang Yuan opened one, read one, and handed one to someone else.

Squadron leader Lu Jianfeng personally brought the test report back. He sat next to Jiang Yuan and watched him open the kraft paper bag. He sighed: "Look at the service of other laboratories. One report is packed in one bag. These hundreds of dollars are not wasted."

Everyone could only cooperate and smile.

The case has been going on until now, and the pressure has also been transmitted to everyone.

At this time, a few hundred yuan for a trace evidence test is nothing.

Jiang Yuan opened and read the first report, and handed it to the person next to him without saying a word.

The person next to him read it and gave it to the person next to him.

Everyone passed it around silently.

Trace evidence in different locations may be meaningful or meaningless.

Interpretation is also important.

However, the focus is still on those substances and contents that cannot be explained by common sense.

Jiang Yuan frowned and quickly flipped through half of the brown paper bag.

Just when he was a little depressed, the conclusion in a new brown paper bag attracted Jiang Yuan.

"They found sawdust in the trace evidence on the chest of the deceased." Jiang Yuan pointed his finger and his eyes lit up.

Lu Jianfeng immediately took it and looked at it, and then looked at the picture specifically. He gestured in front of Wang Zhong's chest and said, "The position is very interesting. Did the murderer use a weapon?"

Jiang Yuan looked directly at Wu Jun: "Master, did you notice the swelling here?"

"The position of the chest? It is indeed a little swollen. I took a picture." After Wu Jun answered, he also took the test report of the trace evidence and took a closer look.

Looking at it, Jiang Yuan's brain circuit suddenly connected:

"It must be a mop stick."

Jiang Yuan muttered a sentence.

At this point, everyone's brain circuits were all connected.

"It's very likely." Lu Jianfeng slapped his thigh, stretched out his hand and gestured, saying: "Take a mop stick, poke the victim's chest, and you can poke him down. Look at the position of the shoes in the video photo, is the distance just right?"

The photos and other things were in front of them, and several people spread them out to look at them, and they all nodded repeatedly.

"But the victim just stayed on the window obediently and let him poke? And why climb the window?" Gao Jiansheng from the imaging office gestured the distance and raised questions at the same time.

"A good person climbed the window, either for money, or because he was wronged, or because he was bullied?" Wu Jun analyzed one by one.

"In this case, other employees in the deceased's company are suspects." Lu Jianfeng pondered.

Jiang Yuan naturally followed this route and reminded: "We have to find this mop stick! This is now a murder weapon."