Chapter 330 Unexpected
There are more than three hundred people living in the entire apartment building.
These people, the QZ City Criminal Investigation Detachment had already conducted an investigation one week after the incident.
One of the key single men even came to inquire.
Now, Wang Song’s suggestion has further narrowed the scope, including those with a history of molestation and voyeurism.
However, this kind of private hobby may not have been caught before. How to judge?
The old method is to find the needle in the haystack.
There are no forensic experts in the crime team, but the crime team actually approves the autopsy report of the QZ City Criminal Investigation Detachment.
The cause of death of the deceased is very clear, and the signs of strength are also obvious.
On the other hand, the body is now being stored frozen in the funeral home and can be inspected for the second time at any time.
On the top floor of the apartment, Wang Song once again checked the layout of the entire apartment.
During the time of the crime, the four elevators in the apartment were operating normally, and the surveillance cameras installed inside had no malfunctions.
The Qinzhou Criminal Investigation Detachment has retrieved surveillance video from the time. A total of 32 people entered the apartment in the elevator before and after the incident.
"Captain Qin Hui, these videos, the videos within half an hour before and after the incident, have someone copy them to me."
"Okay, I will make arrangements right now."
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Wang Song always believed that the other party should be a habitual criminal, and he had been in contact with this kind of suspect before.
Generally speaking, suspects who have committed sexual crimes have some specificity in their eyes or body movements when observing beautiful members of the opposite sex.
This involves the psychological analysis of why there is such a criminal behavior.
The main reason is desire control.
Crime, judging from the consequences of punishment, no one wants to commit a crime.
However, the suspect still commits a crime, especially a crime instigated by strong desires. His personal control ability is weak, and he is lucky enough to think that he can escape legal sanctions, which is the reason why the other party dares to commit the crime.
Soon, the video was sent to Wang Song.
The person in his group was none other than Song Mingguang.
"Captain Song, let's take a look together?"
"Okay, let's take a look together."
Song Mingguang agreed with Wang Song's view, but even if the suspect had specific behaviors of observing the opposite sex, it should not be easily discovered.
It depends on your eyesight. Coincidentally, both Song Mingguang and Wang Song think they have this ability.
Of course, there is a probability of scanning the video to find someone.
After all, in addition to the elevator, there are stairs in the apartment. There is no surveillance here. If the other party leaves the stairs after killing someone, the surveillance in the elevator will definitely not notice it.
QZ City Criminal Investigation Detachment, now investigating the laboratory.
Lu Chuan is making preparations for footprint identification and analysis and making models.
The footprints left by the murderer at the crime scene were wearing 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 obtain more accurate analysis data.
Now, while the model is drying, Lu Chuan is measuring some data around the blood drop collected at the site.
In most cases, two methods are used to collect blood stains.
Because the blood stains at the scene had dried and changed color, Lu Chuan used a thin knife to scrape the blood stains this time.
If the blood stain is not dried, it can usually be extracted with cotton swabs, gauze, or glass pieces.
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 spray-like blood stains and drip-like blood stains remain.
Lu Chuan collected these mainly to analyze the height comparison between the murderer and the deceased by measuring the blood stain data. The deceased Wang Min was 1.65 meters tall. During the murderer's violence, the blood spatter 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 drop-shaped blood stain, the speed and direction of the victim's movement can be determined based on the length of the "tail" of the blood drop.
These tasks have actually been done by the QZ City Public Security Bureau’s on-site investigation.
However, compared to Lu Chuan’s own data, the accuracy is...
There is still a lot of room for improvement.
"Height... 1.75 to 1.78 meters... Very strong, not very old..."
The analysis of the blood stain shape gave Lu Chuan an idea of the murderer conjecture.
Young, in good physical condition, with strong muscles, he can control the victim easily.
Two hours later, Lu Chuan basically completed the blood stain morphological analysis.
The on-site investigators from the QZ City Criminal Investigation Detachment are actually quite good at bloodstain analysis.
I can’t say how brilliant he is, but at least he is quite decent. Lu Chuan also knows Wang Ruiqing, the current surveyor here, and he is about the same level as Yang Sen.
Based on the morphological analysis of blood stains, the other party's reconstruction of the crime scene is relatively accurate.
The reconstruction of the murderer's entry, violence, chopping and other criminal behavior is more in line with the actual situation at the scene.
However, when it comes to judging the relevant physical data of a suspect based on the morphological characteristics of blood stains, it is far behind.
The blood stain morphological analysis is completed, and the shoe print model Lu Chuan initially made is now basically in shape and can be used.
At many crime scenes, in order to confuse the police in handling the case, the murderer will deliberately wear shoes that are one size larger to commit the crime.
There are also some special circumstances where the shoes worn by the murderer will be smaller.
But regardless of whether they are 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, so the characteristics of the footprints left behind are different, making identification and analysis more difficult.
The edges of the foot prints left by shoes of a larger size are more blurred. Compared with normal shoe prints, there is a data difference of about one to two millimeters.
Of course, this depends on how big the shoe is. Generally speaking, a larger size will have an excessive blurring of one to two millimeters.
The smaller size of shoes is mainly determined by the position of the center of gravity.
Normal people’s center of gravity on the feet is at the center of the soles of the feet. For people with normal arches, the center of gravity on the feet is actually in the air.
But it can be measured through the data between the sole of the foot and the heel.
When wearing small shoes, the toes will deform more than the heels.
Small shoes will cause the toes to curl up unnaturally or compressively deform, and the center of gravity on the feet will shift.
Lu Chuan is currently measuring these data, and then through certain restoration, determines the murderer's information.
The QZ City Criminal Investigation Detachment has determined that the female shoe prints found at the scene belong to the deceased.
The shoe size is thirty-eight.
Generally, men with larger feet can only barely put the front half of their feet into shoes of this size, but it is unlikely that they can fit the entire shoe into them.
In this case, the center of gravity of the footprint should be in front of the heel.
But...
Lu Chuan has measured both sides. Not only does the center of gravity of the shoe print not appear as Lu Chuan had judged in advance, it is located farther forward than the heel, but it appears in the middle of the shoe print. location.
In addition, the blurred data around the shoe prints does not show that big feet wear small shoes, but small feet wear big shoes!
"That's not right!"
(End of this chapter)