Heng City!
Foshan Jingyuan, the house where Matsumoto Kozo was suspected to have been killed.
The police officers were a little surprised when they saw Shen Ting holding the measuring tools, quickly measuring the data of the fluorescent blood spots, and then calculating.
Zhuo Yan looked at Xiong Beibei and Xu Xinyi beside him:
“It seems that Team Leader Shen really knows how to analyze bloodstain patterns?
Has he used this technique before when solving cases?"
Xiong Beibei scratched his head: "This, really not."
Xu Xinyi also said:
“This should be the first time it’s used.
But we're all used to it.
This guy Shen Ting often keeps quiet, but suddenly he solves cases using criminal investigation techniques he has never used before.
God knows how many more criminal investigation techniques he knows."
The policewoman with glasses next to her was following Shen Ting out to investigate a case for the first time. She was obviously not used to Shen Ting's rhythm yet and said in surprise:
"The way the team leader measured the bloodstains was obviously very professional!
Moreover, some of the operations seem a bit incomprehensible to me.”
Zhuo Yan nodded:
“The bloodstains in this case are not regular bloodstains.
Heavily wiped and cleaned.
Key features that may exist in the bloodstain's initial state, such as burrs, radial splashes, comet tails, etc., will become blurred or disappear directly due to wiping.
Many of Chen Ting’s actions should be to find ways to avoid the effects of wiping and cleaning.”
Zhuo Yan is right.
Taking the most common tadpole-shaped bloodstain as an example, if a bloodstain is repeatedly wiped by splashing water up and down, left and right, and sprayed with luminol, the fluorescence will obviously no longer be in the shape of a tadpole, but an irregular lump of fluorescence.
Unless a god came, even the most professional experts would not be able to calculate the direction from which such bloodstains came.
If all the bloodstains at the crime scene were like this, then there would be no need for Chen Ting to exchange for bloodstain pattern analysis. He could just pack up and go home!
The reason why Shen Ting exchanged it was because it was impossible for the murderer to wipe every bloodstain so thoroughly when wiping it.
For example, a bloodstain may only be wiped once from left to right. The features on the right will naturally be erased, but the features on the left will still remain.
There will always be this special bloodstain that can be used as a target for identification.
and!
The bloodstains were not singular.
In this case, judging from the injuries on the victim and the distribution of blood, the murder weapon used by the murderer should be a hammer.
The hammer face is square as a whole, with a certain curvature on the edges.
Every time the murderer hit the victim with the weapon, it was impossible for only one drop of blood to splatter, but hundreds, thousands, or even tens of thousands of blood drops splattered at the same time.
Most of these blood drops will form bloodstain groups at similar locations on the receiving object.
Even if 99% of these bloodstains were wiped off, all their characteristics would disappear.
The remaining 0.1% is not completely intact due to wiping, but can still be identified.
The local features of the 0.1% bloodstain residue, if integrated together, would be enough for a top bloodstain expert to analyze the time of the attack!
The relative positions of the murderer and the victim, the part of the body hit by the hammer, the angle and force of the hammer swing, etc.
However, compared to the original bloodstains that have not been wiped off, this analysis is obviously much more complicated.
certainly!
In practice, hundreds or even thousands of bloodstains formed by an attack are generally not completely wiped away, and there will always be complete bloodstains with complete characteristics left behind.
therefore!
In the field of bloodstain morphology analysis, there is a famous saying:
"There's always blood, and it'll appear where you least expect it!"
The "you" here can refer to both the perpetrator and the investigator.
The formation of bloodstains is actually very complicated.
During the process, it will be affected by many forces such as gravity, air resistance, etc. The characteristics of the carrier, obstructions, etc. will also affect the formation and distribution of bloodstains.
When the murderer attacks, most of the blood splatters on the wall, but there may also be a few blood mists splashing on the ceiling, or blood entering the gap behind the cabinet.
The key is!
It is precisely this kind of bloodstain that is usually very subtle, to the point where it is impossible to see with the naked eye.
The perpetrator cannot see it and naturally will not wipe the corresponding area.
For investigators, these bloodstains provide important basis for identification of the blood scene after wiping.
These bloodstains that are invisible to the naked eye are visible under the action of luminol reagent.
Because luminol is a million times more accurate—
If a drop of blood is dropped into a million times the volume of water, luminol can also easily identify it.
What Chen Ting is doing now is to integrate the residual characteristics of the bloodstain group and try to find the complete bloodstains. Through these, he can restore the process of bloodstain formation and reverse the course of the case.
…
About half an hour later, the micro laser transmitter was delivered.
Shen Ting immediately placed the transmitter on the bloodstains he had calculated previously.
The laser that lit up was the blood trajectory he calculated.
As more and more transmitters are installed, multiple areas where lasers intersect are created.
These locations are the source of blood that produces the bloodstain group!
After Shen Ting measured these areas, he basically determined that—
Zhang Li was indeed not the one who killed Matsumoto Koqing.
Normally, if the murderer is not Zhang Li, then it can only be another suspect in this case, Yu Qingwei.
But this is what makes Shen Ting confused. He made a preliminary judgment based on the bloodstains.
Yu Qingwei didn't seem to be the one who committed the crime with a hammer...
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