Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Chapter 330 Unexpectedly
There are more than 300 people living in the entire apartment building.

These people, a week after the incident, the QZ City Criminal Investigation Detachment had already conducted an investigation.

Among them, single men, who are the key points, came to the door to inquire.

Now, Wang Song's suggestion has further narrowed the scope, including those with previous convictions for molesting and voyeurism.

However, such a penchant for privacy may not necessarily be caught, how to judge?

The old way is to find a needle in a haystack.

The experts in the serious crime team did not have forensic doctors, but the serious crime team actually recognized the autopsy report of the QZ City Criminal Investigation Detachment.

The cause of death of the deceased is very clear, and the traces of health are also obvious.

On the other hand, the body is now frozen in the funeral home, ready for a second examination.

On the top floor of the apartment, Wang Song checked the layout of the entire apartment again.

During the time of the incident, the four elevators in the apartment were operating normally, and the surveillance cameras installed inside were not faulty.

The Qinzhou Criminal Investigation Detachment has retrieved the surveillance video at that time. A total of 32 people took the elevator into the apartment before and after the incident.

"Captain Qin Hui, let me copy these videos, the videos taken within half an hour before and after the incident."

"Okay, I'll make arrangements."

Wang Song always believed that the other party should be a habitual criminal, and he had come into contact with this kind of suspect before.

Generally speaking, when a suspect who has committed a sexual crime observes a beautiful opposite sex, his eyes or body movements are somewhat specific.

This involves the psychological analysis of why there is such a criminal behavior.

The main reason is desire control.

Crime, judging by the punishment for the consequences, no one wants to commit a crime.

However, the suspect still commits crimes, especially the crimes instigated by Qiang Jian’s desire. His own control ability is weak, and he thinks that being able to escape legal sanctions is the reason why the other party dares to commit crimes.

Soon, the video was delivered to Wang Song.

The one with him was Song Mingguang.

"Captain Song, let's take a look together?"

"Okay, let's take a look together."

Song Mingguang agrees with Wang Song's opinion, but even if the suspect has the specific behavior of observing the opposite sex, it should not be easy to find out.

It depends on the eyesight. Coincidentally, both Song Mingguang and Wang Song felt that they had such eyesight.

Of course, scanning the video to find someone is possible.

After all, in addition to the elevator, there are stairs in the apartment, and there is no surveillance here. If the other party leaves from the stairs after the murder, the surveillance in the elevator will definitely not find it.

QZ City Criminal Investigation Detachment, the current investigation laboratory.

Lu Chuan is making preparations for footprint identification analysis and making models.

The footprints left by the murderer at the crime scene were worn by the victim's shoes, which caused the footprints left by the other party to be different from normal footprints.

Making a model will help Lu Chuan get more accurate analysis data.

Now, taking advantage of the drying process of the model, Lu Chuan is measuring some surrounding data of blood droplets collected at the scene.

In most cases, bloodstains are collected in two ways.

Because the blood at the scene had dried up and changed color, Lu Chuan used a thin knife this time to scrape off the blood.

If it is at the scene of undried blood, it can usually be extracted with cotton swabs, gauze, and glass slides.

The murderer wiped the floor mainly to eliminate his own footprints and shoe marks, so he did not carefully erase the blood stains on the corners, walls and furniture.

A lot of sprayed bloodstains and dripping bloodstains remained.

Lu Chuan collected these mainly to analyze the comparison between the height of the murderer and the deceased by measuring the bloodstain data.

The deceased Wang Min was 1.6 meters [-] in height. During the murderer's violence, the blood spilling was affected by many factors.

For example, the height comparison between the murderer and the deceased, the strength and angle of the chopping knife, etc.

For the same dripping bloodstain, according to the length of the "tail" of the blood drop, the speed and direction of the victim's movement can be judged.

These tasks have actually been done by the QZ City Public Security Bureau.

However, compared to Lu Chuan's own data, the degree of accuracy...

There is still a lot of room for improvement.

"Height... 1.7 meters five to 1.7 meters eight... Great strength, young..."

The analysis of the shape of the blood stains gave Lu Chuan a rough guess about the murderer.

Young, in good physical condition, with strong muscles, he can easily control the victim.

Two hours later, Lu Chuan basically completed the bloodstain analysis.

The investigators of the QZ City Criminal Investigation Detachment are actually quite good at bloodstain analysis.

I can't say how clever it is, but at least it's quite satisfactory. The current prospecting Wang Ruiqing and Lu Chuan also know each other, and they are about the same level as Yang Sen.

Based on the analysis of the shape of the bloodstains, the other party's reconstruction of the crime scene is relatively accurate.

The reconstruction of criminal behaviors such as the murderer's entry, violence, hacking, etc., is more in line with the real situation on the scene.

However, in terms of judging the physical data of the suspect based on the morphological characteristics of the bloodstains, it is much worse.

The shape analysis of the bloodstains is completed, and the shoe print model that Lu Chuan made at the beginning is now basically formed and ready to use.

In many crime scenes, in order to confuse the police to handle the case, the murderer will deliberately wear shoes that are one size larger to commit the crime.

There are also some special cases, the shoes worn by the murderer will be smaller.

But no matter the size is larger or smaller, the footprints left by the murderer can actually be identified and analyzed by real footprint experts.

However, shoes and feet are of different sizes, and the characteristics of the footprints left behind are different, making identification and analysis more difficult.

The edge of the shoe print left by the one-size-larger shoe is more blurred. Compared with the normal shoe print, there is a data difference of about one to two millimeters.

Of course, this depends on how big the shoe is. Generally speaking, there will be one to two millimeters of excessive blurring for one size larger.

The shoes of one size smaller are mainly determined by the position of the center of gravity.

The center of gravity of a normal person's foot is at the center of the sole of the foot. For a person with a normal arch, the center of gravity of the foot is actually suspended.

But it can be measured through the data between the soles of the feet and the heels.

Wearing small shoes will deform the toes more than the heels.

Small shoes can cause the toes to curl up unnaturally, or compressively out of shape, shifting the center of gravity on the foot.

Lu Chuan is now measuring these data, and then through a certain restoration, judge the murderer's information.

The footprints of women's shoes found at the scene have been determined by the QZ City Criminal Investigation Detachment to belong to the deceased.

The shoe size is 38.

With shoes of this size, men with larger feet can only barely stretch the front half of the foot in, and it is impossible to wear them all.

In this case, the center of gravity of the footprint should be in the front of the heel.

but……

Lu Chuan has already measured both sides, and the center of gravity of the shoe print is not only located in the front of the heel as Lu Chuan judged in advance, but in the middle of the shoe print.

In addition, the blurred data around the shoe prints are not big feet wearing small shoes, but small feet wearing big shoes!
"wrong!"

(End of this chapter)