National Forensic Doctor

The commercial streets in Ningtai County are modeled after Nanjing Road.

Of course, the prosperity and scale between the two are not directly proportional, but the leader's 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 a few buildings for commercial use to expand the commercial space.

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

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

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

And it is a monitoring blind spot.

"This person has a thorough knowledge of surveillance." Wen Ming frowned as he walked out of the police station.

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

Before that, the problems he encountered were mostly legal issues, procedural issues, and sometimes troubles from the victim's family or superiors.

This time the criminal gave Wen Ming a completely different feeling. It was a bit like going fishing with a lure. You thought there was a snakehead in the pond, so you baited it, pulling a fake frog and making various movements to disguise a reptile. But whether there are snakehead fish in the pond is actually unknown until you take the bait.

Jiang Yuan in turn comforted Wen Ming, who was more senior, and said: "At least I got the shoe sample. When I go back, I can check other surveillance to see if there is anyone wearing these shoes."

Two discount store clerks also gave some descriptions of the murderer's appearance, but when the middle-aged man with a relatively popular appearance used language to express it, it was really ordinary and ordinary, and it was difficult to use it as the basis for an arrest.

Although it was said that Huang Qiangmin had applied to his superiors for a portrait artist, no one had any hope.

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

The problem with the portrait is not that it looks like or not, but that it is difficult to find the murderer through the portrait, and it is more about using it for reverse determination. That is to say, after catching the suspect, we can compare it with the portrait.

But when there are witnesses, this model is really like taking off your pants and farting, which is unnecessary.

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

Still using silver eucalyptus as an example——

The reason why this crime is famous all over the country is that it used all kinds of criminal investigation methods, but all the criminal investigation methods were useless. It has fingerprints, but the fingerprints didn't match; it has DNA, and it did DNA tests on all the men in the city, but it still didn't hit; it even has a portrait, and after catching the person, the portrait looked quite similar, but during the investigation stage, it still didn't hit.

After the case was finally detected, 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 won awards.

It can be said that some police officers spend their entire life's efforts on this problem.

Some people may say that in the movies and TV shows of the Free Beacon Country, there are some awesome portrait artists.

Because we are a country of immigrants.

The appearance of the immigrants' countries is highly differentiated, and it is easier for portraitists to capture the characteristics.

In many small places, a gene expression may really be just that one person. For example, a big face, small eyes, a flat nose, or black hair. If you search the whole town, you might find just one person like this, but not much more.

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

Moreover, without training in the early stage, when the professional level of portrait painters gradually improves, cameras will be rolled out faster across the country.

On the other hand, in the lighthouse countries of freedom, people are unwilling to surrender their privacy rights to the government, and the installation of cameras is really limited.

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

Out of respect for his destiny, Huang Qiangmin invited the provincial portrait artist to come over.

But the focus of the work is still scanning and monitoring.

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

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

That is to say, life is involved. Otherwise, without a picture investigation department, just integrating these surveillance videos would be extremely difficult and burdensome.

The main benefit of having a map investigation team is that it can combine the surveillance rights of various departments, reducing a lot of unnecessary internal friction.

As for work such as image enhancement, image reconnaissance departments outside provincial capitals do not pursue it.

You can't hire anyone, and even if you hire someone, you can't keep them.

Jiang Yuan searched the footprint database through the sole patterns, but found no results. It shows that the criminal suspect really bought a new set of clothes in the store to carry out the crime.

This also indirectly indicates that the criminal suspect was very purposeful and premeditated.

Therefore, according to the traditional model, the old detectives who followed the lines of grievances and grievances to explore the interpersonal network became energetic.

There must be a reason for your premeditated act, which means you have a motive.

So if we can find a motive, or in other words, find a conflicting person, will we find the murderer?

The deceased was still a young man and had little social contact. Even including his family conflicts, there were not many people.

Several veteran detectives immediately set off to run around.

Jiang Yuan is not optimistic about this.

The reason is very clear. Although it is premeditated, 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 hide from surveillance.

This skill is not difficult to say, but it must have been learned, and it is not just a simple study, but also practiced.

When it comes to street surveillance, the cameras are basically not hidden, they are just there in plain sight. Even so, it is impossible for ordinary people or first-time perpetrators to avoid them all.

Even under the surveillance of Wanghe Building, the murderer avoided the gate and lobby, and probably entered through the employee passage or something like that.

Without surveillance video, there would be no need to even do 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 found nothing.

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

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 from the criminal squadron came over to study.

Trace physical evidence often proves the existence of a certain substance. As for its meaning, everyone still needs 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 in it, the size of A4 paper, with tables, data and analysis conclusions.

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

Squadron leader Lu Jianfeng came back with the test report in person. He sat next to Jiang Yuan and watched him unpacking the brown paper bag. He sighed with emotion: "Look at the services of this laboratory. One report comes in one bag. These hundreds of dollars are not in vain." .”

Everyone could only smile together.

Until now, the pressure has been transmitted to everyone.

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

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

The person next to me saw it and gave it to the person next to me.

Everyone circulated it silently.

Trace physical evidence in different locations may or may not be meaningful.

Interpretation is also more 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 his mood was a little low, a new conclusion in a brown paper bag attracted Jiang Yuan.

"They found sawdust among the trace evidence on the deceased's chest." Jiang Yuan tapped his finger, his eyes brightening slightly.

Lu Jianfeng immediately took it over to look at it, then 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?"

"Is it on the chest? There is indeed a little swelling. I took a photo." After Wu Jun answered, he also took the test report of the trace evidence and took a closer look.

As he watched, Jiang Yuan's brain suddenly switched on:

"It's a mop stick."

Jiang Yuan muttered something.

At this moment, several people's brain circuits were all connected.

"It's very possible." Lu Jianfeng patted his thigh, stretched out his hand and made a famous gesture, and said: "Take a mop stick and poke the victim's chest to knock him down. Look at the position of the shoes in the video and photo, are they right? Is the distance just right?”

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

"But the victim just stayed on the window obediently and let him stab him? And why did he climb up the window?" Gao Jiansheng from the imaging office gestured the famous distance and asked the question at the same time.

"A good person climbs a window, either for money, or because he is wronged, or else, he is being bullied?" Wu Jun analyzed one by one.

"In this case, other employees in the deceased's company will be suspected." Lu Jianfeng pondered.

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