evening!
The sun has completely set and the light outside the window has become very dim.
The room without lights on is naturally darker.
Just in this dimness, a light blue fluorescence, like a firefly in the dark night, suddenly lit up on the floor.
This is the fluorescent reaction produced when the luminol reagent comes into contact with blood.
As the trace inspector who was spraying the solution exclaimed, all the surrounding police officers came over.
"There really is a fluorescent reaction!"
"So, there was supposed to be a pool of blood here, but it was wiped off, so it's not visible to the naked eye?"
"Luminol is so sensitive!"
"So, this house could really be the scene where Matsumoto Kosei was murdered?"
"Of course!"
"Combined with Zhang Li's sudden move and the bloodstains here.
I can't think of a more likely place for a murder!"
…
Zhuo Yan shook his head, looked at the police officers and criticized them:
"When investigating a case, the worst thing to do is to assume things for granted.
In daily life, bloodstains will appear when you get injured or bleed.
Killing chickens and ducks will leave blood.
Let me tell you something outrageous!
When I was young, I handled a case in which the sofa, stools, table, floor, etc. in a suspect's residence all showed fluorescent light.
We also suspected at the time that the suspect was the murderer and his residence was the scene of the murder.
But it was eventually confirmed that the suspect was innocent.
The blood didn't come from the victim either.
Rather, the suspect killed a chicken a few years ago, and when he started bleeding it, the chicken broke free and flew around the house, leaving the entire house covered in blood.
That... must be very hopeless!
The police officers at the scene couldn't help but marvel at the scene of "flying chickens spilling blood".
Zhuo Yan gave a wink, and the forensic doctor immediately stepped forward, took a blood sample, and took it back to the laboratory for DNA identification.
If it can be confirmed that these bloodstains came from Matsumoto Kozo, the possibility that this house is the first crime scene is very high.
Just as the forensic doctor finished collecting the samples, another surprised voice suddenly came from the side:
"Hey, everyone, come and look, there's a fluorescent reaction here too."
This time the police officer who spoke was standing by the wall.
Everyone looked over curiously, and the shock on their faces became more obvious.
I saw that the entire wall, except for the area near the roof, was almost all glowing with a light blue fluorescence.
The officer continued to spray luminol on the side wall.
Similar to the wall just now, shortly after the spraying was completed, large areas of blue began to light up.
Next, is the ground at the corner between the two walls!
After spraying luminol, the fluorescence is no longer light blue, but a darker blue.
Luminol solution is formed by dissolving luminol, also known as 3-aminophthalhydrazide, hydrogen peroxide and an alkalizing agent in water.
The iron ions in the blood will catalyze the decomposition of hydrogen peroxide in an alkaline environment to form free radicals.
The free radicals then oxidize the luminol molecules to form an excited state.
The excited state is unstable and releases photons during the decay to the ground state.
so!
The higher the fluorescence brightness, the more iron ions acting as catalysts, and naturally the more blood stains remaining in the corners of the wall.
at the same time!
A forensic doctor holding a test strip for blood typing said:
"The blood type is out!
The samples I took all turned out to be type A blood.
When many police officers heard this, expressions of surprise appeared on their faces, even more intense than when they first discovered the fluorescent bloodstains.
Because it is recorded in the personal information of Zhang Li and others that Zhang Li's blood type is AB, and her daughter Zhang Qianqian is also AB.
Yu Qingwei is type O.
It just so happens that Matsumoto Kozo has type A blood.
"Blood type matches!
These bloodstains are likely from Matsumoto Koqing!
"This house was already highly suspicious, and now blood has been found, and the blood type matches that of the deceased.
This is the first crime scene, there's basically no escape."
"Although a safer conclusion requires DNA testing, with all the evidence we have now, there should be no doubt that this is a murder scene.
As for the murderer, it is most likely the homeowner Zhang Li, and possibly her boyfriend Yu Qingwei.
…
Not only the police officers at the scene, but also the crime-solving group started discussing it.
Forensic Pathologist Qin Ming:
"Judging from the amount of blood at the scene, it was definitely enough to cause death.
The bloodstains on the ground should be a pool of blood. It is unlikely that so much blood would be shed in a normal household injury.
The key is the bloodstains on the wall!
Although it has been wiped, it can be vaguely seen that a lot of it appears to be splashed.
This is a common form of blood spray caused by external force attacks.
So much blood splatter can confirm that this house was once a crime scene.
Tang Ren: "That means this is really the place where Matsumoto Kozo was killed~~
Then this case is simple~~
Combined with the previous investigation results, Zhang Li and Yu Qingwei, who had both emotional and financial disputes, must be the murderers~~"
Guan Hongyu: "So does that mean we just need to wait for the DNA test results of the bloodstains to come out, and then the case will be closed?"
Kiko: "Hey, this case is quite simple!
In other words, it took some effort to determine the source of the corpse.
The follow-up investigation went smoothly.
Our Kiko and you guys are so awesome!
︿(￣︶￣)︿"
Obviously!
Regarding the current case, group members also believe that it is basically certain that the house in Foshan Jingyuan is the first crime scene.
The bloodstains in the house were left during the murder of Matsumoto Koqing.
Zhang Li and Yu Qingwei, who are already dead, are most likely the murderers.
Chen Ting thought the discussion was over and was about to turn his gaze away from the case-solving group, but at this moment, Hannibal suddenly left a message:
"I feel like there's something wrong with the bloodstains in this house..."
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