Chapter 43 The meaning of blood drops

Chapter 43 The meaning of blood drops

Hearing this, even if he is not very good at reasoning, Sonoko can understand the dilemma Kudo Shinichi is facing at this moment:

The tactics can be seen through at a glance, but there is no physical evidence that can identify the murderer.

He wore latex gloves and left no fingerprints at the scene.

After killing the man, he threw the gloves into the toilet and flushed them. There was no chance of collecting skin flakes from the items he left behind.

Looking around, except for a few bloody fingerprints without fingerprints, the naked eye could not find any shoe prints, palm prints or other useful traces.

"That being the case"

Seeing that Kudo was in trouble, Suzuki Sonoko couldn't help but look forward to her idol's answer:

"Mr. Lin Xinyi, what do you think of this case?"

"Huh?" Lin Xinyi, who had been silent, finally responded.

He had just been staring down at the corpse and the blood-stained floor, as if in a daze.

But now, when he raised his head, Yuanzi suddenly discovered that

There was no trace of confusion in Lin Xinyi's eyes:

"What Kudo just said is very accurate."

"Although the possibility of premeditated murder cannot be completely ruled out."

"But judging from the current clues, it is more likely that the robbery and murder were impromptu."

Lin Xinyi began by characterizing the case.

Although his words were chosen more carefully, in the final analysis, the meaning expressed was exactly the same as Kudo's.

It’s just that Kudo likes to start from clues on the scene, and he is more accustomed to observing corpses:

"After preliminary inspection, there are only two visible injuries on the deceased's body:"

"The first place was a small area of ​​subcutaneous bleeding on the back of the neck, which was caused by external force."

"This form of attack on the back of the neck shows that the murderer did not intend to kill at the beginning, but just wanted to make the deceased unconscious."

"So Kudo is right, this case is most likely a robbery."

Through the scars on the deceased's neck, Lin Xinyi confirmed Kudo's inference about the case.

Then, he gave Suzuki Sonoko a meaningful look:

"Speaking of which, the injury on the deceased is very similar to the bruise on your neck, Miss Suzuki."

"She must have suffered the same attack as you."

"But unfortunately, this lady is not as alert as you."

"She was not knocked unconscious by the murderer's blow, nor was she knocked unconscious by fashion like you, Ms. Suzuki. As a result"

Suzuki Sonoko: ""

A shiver ran down her spine.

The deceased said that she had the same experience. They both went to an unoccupied bathroom to put on makeup, and were attacked on the back of the neck.

But she reacted in time and pretended to faint.

Otherwise, she would probably be brutally murdered by the murderer in this bathroom just like the deceased.

"Fortunately."

Suzuki Sonoko muttered softly with some fear.

Lin Xinyi continued to elaborate on his thoughts and findings:

"The second injury was an oblique wound located in the xiphoid process of the chest. The wound edge was neat, the wound wall was smooth, there was no inter-tissue bridge in the wound cavity, and the wound angle was blunt and sharp."

"This was an apparent stab wound with a single-edged sharp instrument."

"Judging from the deceased's pale skin and fingernails on both hands, as well as the amount of bleeding in the chest and abdomen."

Lin Xinyi moved his gaze to the chest and abdomen of the deceased, which was completely stained red with blood:

"Judging from the angle of entry and the length of the murder weapon, the knife probably cut through the pericardium, ruptured the inferior vena cava, entered the right chest cavity and pierced the lungs, eventually causing hemorrhagic shock and death."

After saying this, Lin Xinyi directly summarized the clues and reviewed the case process:

"Based on existing clues, it is speculated that the murderer was probably waiting for the train at the platform when he saw the deceased entering the bathroom alone to put on makeup."

"Because the deceased was fashionably dressed and well-groomed, and looked like a wealthy man."

"The bathroom is under maintenance and no one is entering or leaving, so it is more suitable for committing crimes."

"So the murderer made an impromptu decision and quietly followed the deceased into the bathroom, intending to attack the neck from behind to knock the deceased unconscious, and then rob her of property."

"But the deceased was not as easy to knock out as the murderer thought."

"Not only did the deceased not faint, but he was still awake and ready to call for help or even resist."

"This made the murderer very nervous - because the platform was full of people outside, and if he made any noise, he would be discovered immediately."

"So, in order to control the situation in time, the murderer took out the short knife he carried and almost without hesitation, stabbed the lady in the chest."

Lin Xinyi took a deep look at the lady who died tragically in a pool of blood:

"For such a simple and ridiculous reason"

"A young life has been lost."

Seeing too many cases will always make people lament the fragility of life and the impermanence of fate.

Suzuki Sonoko felt the sentimentality expressed by Lin Xinyi, and couldn't help but become quiet.

However, after a brief period of silence

"etc"

Suzuki Sonoko suddenly reacted:

"Isn't this similar to what Kudo just said?"

Although the way of telling is different and the way of discovery is also different, what Lin Xinyi is saying now is nothing more than repeating Kudo's reasoning.

In fact, there were some places where he was not as detailed as Kudo.

For example, Kudo also confirmed through bloody fingerprints and small blood drops that the murderer was wearing latex gloves, and knew that the murderer went to the toilet stall after killing the person and flushed the gloves down the toilet.

In contrast, Lin Xinyi's reasoning focuses more on restoring the details of the deceased's life experience and telling the pain of the deceased, but

After talking about it for a while, the most critical issue has never been solved:

"How to find out the identity of the murderer?"

Suzuki Sonoko asked in confusion, and Kudo Shinichi also cast a curious look.

"It's very simple."

Lin Xinyi answered very lightly:

"The murderer was stained with the blood of the deceased. All he needs to do is find the one with the blood on him."

"That's unlikely, isn't it?"

Kudo Shinichi immediately raised objections:

"There was no clothing left at the scene, indicating that the deceased escaped directly wearing the clothes he wore when he committed the crime."

"If the blood splattered and stained his body, how could the murderer blend into the crowd wearing these blood-stained clothes?"

"And if the blood didn't splatter and just flowed along the blade," "then the murderer's hands were covered by gloves. As long as he paid a little attention, there would be no blood on his body at all."

"Not having gloves to cover it just makes the possibility of getting blood very small."

"But that doesn't guarantee there won't be one."

Lin Xinyi retorted in a similar way.

"Forehead"

Kudo was speechless:

Indeed, there is no guarantee that there will not be.

Then try to look for them, maybe you will find someone with blood on them.

There is nothing wrong with this idea, but

This was more like trying his luck and did not show Lin Xinyi's expected technical level.

If you are unlucky and don't run into it, you will have to waste the effort of checking more than 100 people.

And those are more than 100 impatient Tokyo citizens. If they can stay here now, they are already giving face to Mao Lilan's fist.

But after all, Xiaolan would not take action, and those passengers would never wait there obediently, letting the investigators think of a way to come over and try to investigate.

If it drags on for too long and more than 100 citizens gather to make a fuss, even the Metropolitan Police Department will have to let them go.

Therefore, it is still necessary to come up with accurate and effective troubleshooting methods as soon as possible.

Kudo was thinking so.

But then, unexpectedly, Lin Xinyi immediately added evidence for his point of view:

"The possibility of blood on it is there."

"And I can prove that the murderer must be stained with the blood of the deceased."

"Come and look at those little drops of blood on the ground—"

As he spoke, Lin Xinyi pointed his finger at the long string of small blood drops on the ground.

These little drops of blood spread from the fallen body of the deceased to the toilet cubicle where the murderer abandoned the knife.

Obviously, just as Kudo theorized, these were drops of blood that fell from the murderer's way to the toilet cubicle while carrying the knife after killing someone.

But Lin Xinyi saw something more from these small blood drops:

"This kind of blood drop is called dripping blood stain in trace science."

"The so-called dripping blood stains are blood stains formed by blood dripping onto the surface of an object under the influence of gravity."

"This kind of blood stain is usually round or nearly round in shape."

"However, in most cases, the surface of the object on which the blood is dripping is not smooth."

"So, 'burrs' will appear around the dripping blood."

(It probably looks like this:)

With that said, Lin Xinyi motioned to Kudo and Sonoko to come closer, squat down, and observe the small blood drops on the floor up close.

Sure enough, they all noticed that around those round blood drops, there were "thin blood needles" visible to the naked eye in the shape of stars, protruding in all directions.

At this time, Lin Xinyi further added:

"Take a closer look. Are the burrs on these blood drops mostly long on one side and short on the other?"

"Really, although it's not obvious, you can still see that the burrs on the left and right sides of a blood drop are different lengths."

Miss Suzuki sighed as if she had discovered a new world:

"why is that?"

"Because these blood drops were all dropped when the murderer was in motion."

Lin Xinyi explained carefully:

"The size and length of the burrs around a blood droplet that drips vertically in a static state are relatively uniform."

"But when the murderer was walking towards the toilet cubicle, the blood drops falling from his body would have a horizontal speed."

"When the blood drops fall to the ground, the blood condenses more in the direction the velocity points, and the burrs in that direction become longer."

"That is to say"

Lin Xin paused and explained emphatically:

"The side where the burrs grow is the direction the murderer was moving at that time."

"For example, the long burrs of this blood drop pointed at the toilet cubicle, which proves that the murderer did hold the bloody knife and walked towards the toilet cubicle."

"This" Suzuki Sonoko was a little confused after hearing this:

"What's the use of knowing this?"

"After the murder, the murderer went to the toilet cubicle and threw the murder weapon and gloves. Isn't this the conclusion that Kudo has already reasoned?"

"No that's useful."

It was Kudo Shinichi who denied it.

He stared at the ground carefully, his eyes extremely focused:

"I understand what Mr. Lin Xinyi means."

"The direction of the burrs on the blood droplets can show the direction of the murderer's movement at that time."

"And here are the drops of blood"

Kudo Shinichi pointed to a special drop of blood on the ground:

"Not all blood drops are pointed at that toilet stall with burrs."

"There are several blood drops among them, and the burrs on their edges are pointing in the completely opposite direction to the other blood drops!"

"Uh?" Suzuki Sonoko could no longer keep up.

"Remember, the long burrs of the blood drop are pointing in the direction of the murderer's movement at that time."

Looking at Miss Yuanzi who was a little confused, Lin Xinyi emphasized this knowledge point again:

"And some of these blood droplets have long burrs pointing in opposite directions, indicating"

"These drops of blood were different from other drops of blood in that they were not dropped on the killer's way to the toilet cubicle."

"They were dropped when the murderer left the toilet stall and returned to the sink along the same route, so the direction of the burrs is completely opposite to that of other blood drops."

"That is to say"

"After the murderer threw the murder weapon in the cubicle and threw the gloves into the toilet"

"There's still blood falling from him!"

"The blood dripping at this time was not on the gloves and murder weapon at all, but directly on the murderer's body."

Finally, Lin Xinyi seriously concluded:

"So, it is not difficult to imagine that the gloves did not completely block the gush of blood from the deceased."

"The blood must have flowed smoothly to the murderer's arm, and as long as we find the person whose arm is stained with the blood of the deceased, we can confirm who is the murderer."

"indeed so"

"but"

Kudo quickly found a loophole in Lin Xinyi’s idea:

"After the guy threw away the weapon and gloves, he probably went to the sink to wash his arms."

"Otherwise, it would be difficult for him to blend into the crowd if his arms were stained with conspicuous blood."

"it does not matter."

Lin Xinyi smiled very calmly:

"It's useless even if he washes his hands cleanly."

"As long as he is really stained with blood, I will definitely be able to find him out!"