In the entire apartnt building, more than three hundred people reside.
These individuals were investigated by Qinzhou City’s Criminal Investigation Team within a week after the incident.
Particular attention was paid to single males who were questioned in person.
Now, Wang Song’s suggestion has narrowed the focus further to individuals with a history of lewd behavior or voyeurism.
However, such private tendencies might not be caught before, so how should they be judged?
The old thod: it’s still like searching for a needle in a haystack.
The special task force doesn’t have a Forensic Doctor, but they do recognize the autopsy report from Qinzhou City’s Criminal Investigation Team.
The cause of death of the victim is very clear, as are the signs of assault.
anwhile, the body is currently preserved in the morgue and can be re-examined at any ti.
On the top floor of the apartnt, Wang Song inspected the layout of the entire apartnt once more.
During the ti of the incident, all four elevators in the apartnt were operating normally, and the surveillance caras installed inside also had no malfunctions.
The Qinzhou Criminal Investigation Team has retrieved the surveillance video from that ti; thirty-two people used the elevator to enter the apartnt around the ti of the incident.
"Captain Qin Hui, could soone get the videos from half an hour before and after the incident?"
"Sure, I’ll arrange that."
Wang Song firmly believes that the perpetrator is likely a repeat offender. He has encountered such suspects before.
Usually, suspects of sexual cris exhibit certain distinctive behaviors in their gaze or body language when observing attractive individuals.
This involves the psychological analysis of why soone would commit such an assault.
The main reason is the lack of desire control.
No one would willingly commit a cri, looking at the punishnt of the aftermath.
However, the suspect still commits the cri, especially in cris fueled by desire, like assault. The person lacks self-control and foolishly believes they can escape legal consequences, which emboldens them to commit the cri.
Soon, the video was handed over to Wang Song.
His partner was precisely Song Mingguang.
"Captain Song, shall we watch it together?"
"Sure, let’s watch it together."
Song Mingguang agreed with Wang Song’s perspective, but even if the suspect exhibits distinctive behavior when observing others, it shouldn’t be easily noticeable.
This is about keen observation skills; coincidentally, both Song Mingguang and Wang Song believed they possessed such skills.
Of course, finding a person in the video involves so level of probability.
After all, besides the elevators, there are also stairs in the apartnt. The stairs are not monitored, so if the perpetrator left via the stairs, the elevator’s surveillance wouldn’t capture anything.
Qinzhou City’s Criminal Investigation Team, Cri Scene Investigation Laboratory.
Lu Chuan was preparing the Footprint Identification and Analysis work, creating a model.
The perpetrator left footprints at the scene, wearing the victim’s shoes, which made the footprints left abnormal compared to normal footprints.
Creating a model helps Lu Chuan obtain more accurate analytical data.
Now, during the model’s drying process, Lu Chuan is asuring so surrounding data of the blood droplets collected at the scene.
Bloodstain collection mostly employs two thods in general.
Since the bloodstains at the site had dried and changed color, Lu Chuan used a scalpel to scrape off the bloodstains this ti.
If the bloodstains were still wet, thods like using cotton swabs, gauze, or glass slides could be applied for extraction.
The perpetrator wiped the floor mainly to remove the shoe prints, so the bloodstains on corners, walls, and furniture weren’t ticulously wiped.
A lot of spatter and drip patterns remained.
Lu Chuan collected these to analyze the height comparison between the perpetrator and the victim by asuring the bloodstain data.
The victim, Wang Min, was 165 cm tall, and during the assault by the perpetrator, the blood spattering was influenced by nurous factors.
For instance, height comparison of the perpetrator and the victim, the force of the weapon, angle, and so on.
Similarly, from the drip patterns, based on the "tail" length of the droplets, the victim’s speed and direction can be determined.
This work has also been conducted by the City Public Security Bureau in Qinzhou.
However, compared to the data Lu Chuan gathered himself, there’s still much room for improvent in accuracy...
"Height... 175 to 178 cm... very forceful, not very old..."
The Bloodstain Pattern Analysis gave Lu Chuan a rough profile of the perpetrator.
Young, physically fit, with strong muscles, capable of easily overpowering the victim.
After two hours, Lu Chuan basically completed the Bloodstain Pattern Analysis.
The Cri Scene Investigation personnel in Qinzhou City’s Criminal Investigation Team are also quite adept at bloodstain analysis.
It’s not exceptionally brilliant, but at least it’s systematic. Lu Chuan is familiar with Wang Ruiqing and feels their skill level is similar to Yang Sen’s.
The cri scene reconstruction based on their Bloodstain Pattern Analysis is fairly accurate.
The re-enactnt of the perpetrator entering the room, assaulting, and slashing corroborates the actual situation at the scene accurately.
However, there’s a significant gap concerning the Body Data Judgent of suspects based on bloodstain characteristics.
With the Bloodstain Pattern Analysis complete, the shoe print model Lu Chuan initially made is also mostly finished and ready to use.
In many cri scenes, to mislead the police, the perpetrator intentionally wears shoes one size larger when committing the cri.
There are also cases where the perpetrator wears slightly smaller shoes.
But regardless of whether the shoes are larger or smaller, the footprints left behind can be identified and analyzed by a real footprint expert.
However, shoe and foot size disparity results in differentiated footprint characteristics, making the identification analysis relatively difficult.
Shoes one size larger leave more blurred shoe print edges, presenting roughly a one to two-milliter data difference compared to standard shoe prints.
Of course, this depends on how much larger the shoes are; usually, one size larger yields about a one to two-milliter blurred edge.
Conversely, in smaller shoes, the focus is on determining the center of gravity.
Typically, the foot’s center of gravity is in the middle of the foot, and in people with a normal arch, the foot’s center of gravity is practically suspended.
However, asurents can be made between the ball of the foot and the heel.
When in smaller shoes, the toes are more deford compared to the heel.
Small shoes lead to curling or compressive deformity of the toes, shifting the foot’s center of gravity.
Lu Chuan is currently asuring this data, then performing a certain restoration to determine the suspect’s information.
The female footprints found at the scene have been confird by Qinzhou City’s Criminal Investigation Team to belong to the victim.
The shoe size is a 38.
This shoe size generally ans that a man with slightly larger feet can only barely insert the front half of the foot and can’t fully wear it.
In such a case, the footprint’s center of gravity should be located near the front of the heel.
However...
Lu Chuan already asured both sides, finding that the footprint’s center of gravity is not near the front of the heel as initially determined by Lu Chuan, but rather centrally and slightly forward.
Additionally, the blur data around the shoe print doesn’t indicate large feet in small shoes but rather small feet in large shoes!
"No, that’s not right!"
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