Chapter 369 A button

The scratches are very thin and the traces left are not particularly deep.

However, being able to leave scratches on the bones means that the murderer used very strong force when stabbing!

With the support of visual gene locks, the scratches on the ribs gradually magnified in Chen Yan's eyes.

The first is to judge the technique of holding the knife in the palm of your hand.

The murderer stabbed the dead man in the back from behind.

The sharp blade pierces the back of the chest and penetrates the heart. The tip of the knife finally hits the inside of the ribs, leaving scratches.

The result of this penetration injury shows that the murderer was very strong at that time.

If you want to achieve such a large force, the general method of holding a knife is not good.

The force of holding the knife in the forehand stabbing it from behind into the chest cavity was not that strong.

If you want to penetrate it with one knife, you should hold the knife in the backhand.

From top to bottom, swing out!

With the help of the inertia of the knife, one knife pierces the back of the chest, then penetrates the heart and goes straight to the ribs.

While observing, Chen Yan waved his right hand slightly, imitating the murderer's stabbing movement at that time.

When Zhang Man saw Chen Yan's actions, he knew what Chen Yan wanted to do.

Restore the murder scene.

Through this method, the crime scene can be judged to a certain extent.

This infers some characteristics of the murderer.

Next is to analyze the direction of the scratches.

Chen Yan lay next to his ribs and made a careful judgment.

The cutter cuts to the ribs, and from the beginning to the end, the depth and shallow marks are different.

Generally speaking, any scratches caused by a tool when it comes into contact with an object are from shallow to deep.

The same goes for the tip of the knife to touch the ribs.

From the initial contact to the end, the tool stops moving due to bone blockage.

Scratches are also a process from shallow to deep.

If you look closely, the traces on the ribs start from bottom to top.

This is interesting.

The murderer held the knife in his back hand and stabbed the victim suddenly.

The movement direction of the tool is actually from bottom to top...

what does that mean?

This means that the position where the murderer raised his hand to attack was shorter than the victim's chest!

Standing up, Chen Yan waved his arm into the air.

After a while, Chen Yan looked at Zhang Man: "Sister Zhang, please simulate the situation of the crime scene with me."

Zhang Man nodded: "Okay!"

Zhang Man's height is 167, which is about the same height as the victim.

Standing behind Zhang Man, Chen Yan kept adjusting his position.

With his right hand, he held a scalpel taken from the anatomical table.

With Chen Yan's height, cut the knife from behind Zhang Man. If the tip of the knife passes through the heart and presses against the ribs, the direction of the rib scratches caused by the tip of the knife should be from top to bottom, from shallow to deep.

Chen Yan slowly bent his legs and lowered his height.

In my mind, Zhang Man's body seemed to be slowly fading.

Only one skeleton is left.

The third rib protects the heart and the scalpel in the hand is constantly adjusting its orientation.

Puff!

The tip of the knife leaped down and stabbed into the back of the chest.

Then penetrate the beating heart and press it on the third rib!

Crack!

The harsh friction sound seemed to resound in Chen Yan's mind.

Everything happened in imagination.

Scratches, from bottom to top, correspond exactly to the scratches on the bones.

At this time, Chen Yan was about to squat on the ground.

One meter two!

At this time, Chen Yan's arm height was 1.2 meters, just under Zhang Man's armpit.

And Chen Yan's height is one meter four at this moment!

"The murderer is about one meter and four!"

"And... the tool he used to commit crimes...is very special!"

Very special.

Yes.

Why special?

Because the human ribs are different from those of ordinary animals, especially pork chops, lamb chops or steaks that people often eat.

For ordinary reptile mammals, the ribs are not fully wrapped in the parts that protect the internal organs.

On the abdomen, from top to bottom, it gradually opens.

However, humans, monkeys, orangutans, baboons and other mammals that can walk upright, have their ribs surrounded by all their ribs.

Starting from the sternum, it spreads into a cage, protecting all important organs in the ribs.

Therefore, even if the murderer cut the victim from behind, he killed the victim.

If the knife used by the other party is just the sharp knife we ​​usually use, it will definitely touch the ribs behind it.

In other words, if a general knife wants to penetrate the chest cavity from the back of the human body, pierce the heart, and damage the inner side of the third rib, it will first definitely damage the ribs behind it.

However, Chen Yan did not find any scars on the ribs behind the skeleton.

Therefore, the killer used a very thin and long knife.

The width is very narrow to penetrate the ribs behind it without damaging the ribs.

Only when the length is sufficient can it penetrate the entire chest cavity and damage the inner side of the front ribs.

So, will the murderer specially create a slender knife specifically for the purpose of causing this injury?

Unless the other party is a superb blacksmith, in modern society, ironwork...

It’s not that there is no such possibility, but Chen Yan believes that the possibility is very small.

Don’t forget that Chen Yan once received a tool cognitive map rewarded by the system.

There are ready-made knives that can cause such injuries.

In reality, the most commonly used and most common one is... a ham slicer!

A kind of Western restaurant cutter.

Slim and sharp.

With such a judgment, Chen Yan focused his attention on the button found in the oral cavity of the bone.

One button!

After Zhao Kuo called the police, the on-site surveyor of a team of detectives found an important physical evidence at the cemetery.

A button with gold edges on a black background.

Ten years ago, when Zhao Kuo buried his father's ashes, he put a lot of funeral objects on it.

However, there must be no buttons inside.

According to local customs, a set of funeral clothes were buried in Zhao Kuo's father's tomb.

But there will be no buttons on the shroud.

This is a custom, and shrouds are worn after a person dies.

Because it is impossible to wear clothes like normal people after a person dies, the structure is special.
To be continued...