civil forensic

Chapter 158 Murder Weapon
The commercial street in Ningtai County was built in imitation of Nanjing Road.

Of course, the degree of prosperity and scale between the two are not directly proportional, but the leadership's heart is commendable.

In general, the most central commercial street in Ningtai County is to seal off an original road, and the shops on both sides are opening up. By the way, a few buildings will be demolished for business, and the commercial space will be expanded.

At the same time, there are constantly small alleys and forks in the middle of the commercial street connecting the crowds.

Before online shopping became popular in the county, the commercial street was comparable to the provincial capital Changyang in terms of population density.

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

And it is a monitoring blind spot.

"This person is a bit thorough in surveillance research." After leaving the police station, Wen Ming frowned.

He has been a criminal police officer for several years, and he has never seen such a difficult criminal.

Before that, the problems he encountered were mostly legal and procedural problems, and sometimes they came from the families of the victims or the troubles from their superiors.

This time the criminal gave Wen Ming a completely different feeling. It’s a bit like going wild fishing with a lure. You think there are snakeheads in this pond, so you bait it, dragging fake frogs, and doing various movements pretending to be reptiles. But whether there are snakeheads in the pond or not is actually unknown before the bait is taken.

Jiang Yuan in turn comforted Wen Ming, who was older, and said, "At least I got the shoe sample, and I can check other surveillance cameras when I go back to see if there is anyone wearing this shoe."

Two discount store clerks also made some descriptions of the murderer's appearance, but compared to the middle-aged man with a popular face, when he expressed it in words, it was really ordinary and ordinary, and it was difficult to use it as a basis for arrest.

Although it is said that Huang Qiangmin has applied for a portrait artist to his superiors, but everyone has no hope for this.

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

The problem with portraits is not a question of likeness, but that it is difficult to find the murderer through portraits, and more is to use them for reverse determination.That is to say, the criminal suspect was caught, and then compared with the portrait.

But in the presence of eyewitnesses, this model is really taking off your pants and farting, and it's superfluous.

Some units even believe that the portrait interfered with the investigation...

Still using the silver case as an example——

The reason why this case is famous all over the country is because it exhausted all kinds of criminal investigation methods, but all kinds of criminal investigation methods were useless.It has fingerprints, but the fingerprints are not matched; it has DNA, and it has done DNA for all the men in the city, but it still fails; it even has portraits, and after the arrest, the portraits are quite similar, but in the investigation stage, it still fails.

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

Some police officers, it can be said that their whole life's efforts have been used in this case.

Some people may say that in the movies and TV series of the Free Beacon Country, there are portraitists who are awesome.

Because the family is an immigrant country.

Immigrant countries have a high degree of discrimination in appearance, and it is easier for portrait artists to grasp the characteristics.

In many small places, a gene expression may really be just such a person.For example, a flat face, such as small eyes, such as a flat nose, such as black hair, search the whole town, maybe there is only one like this, and there are not many.

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

Moreover, there is no training in the early stage. When the professional level of portrait artists gradually improves, cameras will spread faster across the country.

On the other hand, in the Beacon of Freedom, people are unwilling to transfer the right to privacy to the government, and the installation of cameras is really limited.

The national conditions are different, and the police's operating methods are also very different.

Out of respect for the murder case, Huang Qiangmin invited a portraitist from the province over.

But the focus of the work is still to scan and monitor.

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

The monitoring around the commercial street and the monitoring around the Wanghe Building are all an area, but the monitoring of many days and the monitoring of different departments add up to a huge amount.

That is to say, a homicide case was involved. Otherwise, in the absence of a graphic investigation department, it would be extremely difficult and burdensome just to integrate these surveillance videos.

This is also the core reason why map investigation teams have been established in various places.

With the Graphic Investigation Team, the main advantage is that the monitoring rights of various departments can be combined, reducing many unnecessary internal frictions.

As for work such as image enhancement, the graphic investigation department outside the provincial capital does not pursue it.

You can't hire people, and you can't keep them if you hire them.

Jiang Yuan searched the footprint library through the sole pattern, but got no results.It shows that the criminal suspect really bought a new set of clothes in the store to commit the crime.

This also indirectly indicates that the criminal suspect has a strong purpose and premeditated committing the crime.

Therefore, according to the traditional model, the old detectives who followed the line of grievances and hatred to explore the interpersonal network came to their spirits.

There must be a reason for your premeditated crime, which means there is a motive.

If we can find the motive, or in other words, find the person who has conflicts, will we find the murderer?
The deceased was still a young man with little social contact, even including his family conflicts, there were not too many people.

Several old criminal policemen set off immediately to run around.

Jiang Yuan is not optimistic about this.

The reason is very clear. Although the crime was premeditated, the people who usually want to kill because of grievances and hatreds are just ordinary people.

The suspect this time is not ordinary.

At least, he knows how to avoid surveillance.

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

Surveillance on the street, the cameras are basically not hidden, just placed there brightly, even so, it is impossible for ordinary people or first-time perpetrators to avoid them all.

Even under the surveillance of the Wanghe Building, the murderer avoided the gate and the lobby, probably entering through the staff passageway or something like that.

Without surveillance video, there is no need to do image enhancement.

No footprints or fingerprints.

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

In the past few days, some people have begun to re-question the question of homicide or suicide.

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

Not only Jiang Yuan, but half of the technicians of the criminal squadron came to study.

As for trace physical evidence, it often proves the existence of a certain substance. As for the meaning it represents, we still need to analyze and study it ourselves.

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

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

Jiang Yuan opened one, looked at one, and passed one to someone else.

Squadron leader Lu Jianfeng came back with the test report in person, sat next to Jiang Yuan, watched him unpack the kraft paper bag, and said with emotion: "Look at the service of their laboratory, a report is packed in a bag, and these hundreds of dollars are not in vain. .”

Everyone can only smile together.

Now that the case has progressed, the pressure has also spread to everyone.

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

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

The people next to me saw it, and then gave it to the people next to me.

Everyone passed it on silently.

Trace physical 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 soon finished half of the kraft 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 nodded with his fingers, his eyes brightened slightly.

Lu Jianfeng immediately took it over to look at it, and looked at the picture specifically, then made a gesture on Wang Zhong's chest, and said, "The location is very interesting, did the murderer use a weapon?"

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

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

Looking at it, Jiang Yuan's brain circuit was suddenly connected:
"It's a mop stick."

Jiang Yuan muttered a word.

Now, the brain circuits of several people are all connected.

"It's very possible." Lu Jianfeng patted his thigh, stretched out his hand, and said, "Take a mop stick and poke the victim's chest to stab him down. Look at the position of the shoe in the video, isn't it?" Is the distance just right?"

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

"But the victim just stayed on the window obediently and let him stab it? And, why did he climb the window?" Gao Jiansheng from the video office drew a distance and asked a question at the same time.

"A good person climbs 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 company of the deceased will be suspected." Lu Jianfeng pondered.

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

　I've been sleeping too late for the past few days, and I can't stand it any longer. Today is the only update.

　　
　
(End of this chapter)