[Congratulations to the host, you have spent 15 skill points and successfully redeemed "Blood Spatter Form Analysis"!
5 skill points remaining. 】
As the system prompt sounded, a large amount of knowledge related to bloodstain analysis immediately appeared in Shen Ting's mind.
The content involved is quite complicated!
There are different forms of bloodstains formed by the influence of gravity, inertia, viscosity, air resistance, surface tension, etc.
How to determine the relative positions of the murderer and the victim when there is blood splatter.
How to identify the possible direction of the victim's movement after blood splatter and the murderer's pursuit posture.
There are also bloodstains that lose their key features after being wiped, so how to determine their splash angle, etc.
For all this knowledge, learners in the blood-spattered form, from undergraduate to graduate and then to doctoral level, may only be able to learn two or three tenths of it.
After Chen Ting exchanged it, he quickly mastered this precious knowledge in just a few breaths.
at the same time!
When Shen Ting saw the bloodstains at the scene before, he just thought it was normal and couldn't see any problems.
And now!
As he absorbed more and more knowledge, Shen Ting looked at the high-definition fluorescent photos of bloodstains he had taken before, and felt a sense of disharmony.
"Hannibal, it seems to be right!"
Hannibal had said before that the distribution of blood on the wall made him feel uncomfortable.
Shen Ting now had a similar feeling.
Moreover, he could vaguely feel that this uncomfortable feeling came from the discrepancy between expectations and reality.
that is!
If Zhang Li killed Matsumoto Ziqing with a weapon, the bloodstains formed should be different from the bloodstains today.
The difference is very, very small!
This is because of subtle differences in the bloodstain formation process caused by indirect factors such as the size of the murder weapon or the height and body shape of the murderer.
"Of course, whether Zhang Li wears high heels or not, and the height of the heels, etc., will make a difference."
In the final analysis, Shen Ting could only see that there was a problem, but he could not determine the root cause of the problem for the time being.
"We need to further confirm the process of bloodstain formation."
Chen Ting went straight to Zhuo Yan:
"Director Zhuo, do you have the tools for analyzing bloodstains using the string method?"
Wire pulling method?
Zhuo Yan was stunned for a moment, and it took him a while to react:
“Team Leader Shen, the string pulling method you mentioned is a method of confirming the origin of the bloodstain by pulling the string, right?
Do you want a more detailed identification of the bloodstains?
Did you see anything?
By the way, Team Leader Shen, do you even know how to identify bloodstains?
Isn't this string-pulling method rarely used these days?"
Zhuo Yan blurted out all the questions in his mind.
Chen Ting smiled and said, “I guess I understand a little bit!
Since the person involved in this case has died, the specific process of the murder cannot be determined.
I want to reconstruct the crime scene through bloodstain pattern analysis and confirm the details of Matsumoto Kozo's murder.
If, after the scene reconstruction, Zhang Li or Yu Qingwei is still the murderer, then this case will be completely clear.”
"This... is naturally better."
Zhuo Yan nodded repeatedly.
The string pulling method refers to fixing one end of the string at the bloodstain location and stretching the other end along the calculated direction.
Then observe the intersection area of multiple lines in space.
This method is indeed not used by anyone nowadays, and people usually use software for automatic analysis.
However, software analysis involves the shooting angle, lighting conditions, etc. of the bloodstain photo, and the error can sometimes be quite large.
Especially for bloodstains that have been wiped, it is more difficult for software to analyze.
“It seems that there are no special wires or fixing tools for the wire pulling method.
However, I remember there were small laser transmitters, about the size of a pen cap.
Team Leader Shen, do you think it can be used? "
“Yes!
Lasers are better than string!"
"Okay, I'll have someone prepare it right away."
…
While waiting for the laser launcher, Shen Ting was not idle either.
He first carefully observed the high-definition photos of the bloodstain fluorescence, and confirmed the relative position of Matsumoto Kozo when she was attacked by the areas on the floor where the blue fluorescence was deeper and wider.
We have a general understanding of the crime process.
Then!
Look carefully at the bloodstains on the wall.
Observing the high-definition photos was not enough. After Shen Ting found the special bloodstains, he also asked the trace inspector to spray luminol again at the corresponding location on the wall.
When the fluorescence came on, he quickly measured the length of the long and short axes of the bloodstain, as well as the distance of the surrounding blood spots.
Then calculate the incident angle of the blood drop to prepare for the subsequent wire-pulling method.
As more and more bloodstains were counted, Shen Ting became more and more certain that there was indeed something wrong with the bloodstains.
At least!
Zhang Li shouldn't be the one who killed Matsumoto Ziqing...
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