Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Chapter 418: Human Experience Hurt
The information a corpse can bring to solve a crime is far greater than ordinary people imagine.

Some people say that corpses can talk, and to some extent they are.

In most cases, corpses, in addition to providing some basic information such as time of death and manner of death, can also feed back information about the murderer to a certain extent.

Such as stab wounds.

In the field of current investigation, there is a professional branch called injury appraisal.

To put it more carefully, it is based on the identification standard of human body injury degree.

When Lu Chuan is fine, he will also help the criminal police brigade or police station in need in the west to make such identifications.

This thing is a rigid standard that gives a legal appraisal level for human body injuries.

According to the degree of damage to the human body, it is divided into serious injury, minor injury and minor injury.

Generally speaking, the vast majority of injuries to the human body are minor injuries. This does not mean that minor injuries are not serious, but as long as they do not cause functional impairment or disability to the human body, they are considered minor injuries.

Damage standard appraisal is similar to treating the human body as an object. No matter how damaged the appearance is, as long as the object can be used, most injuries will be minor.

However, if it causes functional impairment, such as deafness in one ear and blindness in one eye, this is a minor injury. If both ears are deafened and both eyes are blind, this is consistent with the loss of hearing or vision in a serious injury. Standard, it can be identified as serious injury.

In addition to the above injury identification, this branch also derives a corpse injury identification.

This is part of the field survey, and Lu Chuan's intermediate field survey skills include knowledge and experience in this area.

Lu Chuan explained to everyone: "The angle of the body's posterior heart is from the upper line to the lower line. Based on the angle of the wound entrance, the height ratio of the opponent and the deceased can be calculated. As for the depth...the opponent's knife was powerful and heavy, breaking through the connection between the posterior sternum and the posterior heart. Protection, this shows that the other party is extremely powerful."

"Teacher Lu, do you have a specific calculation method?"

A forensic doctor asked, "This is a good time to learn secretly. If you can learn this trick, you can also pretend to be like this when you go back. Wouldn't it be wonderful?"

Lu Chuan nodded: "This is true. The angle of the knife changes through a sine function, which is calculated through the empirical regression equation, and then corrected using the probability method..."

The forensic doctors listened with interest at first. After all, the most capable forensic doctors were all college graduates back then.

At least the basic sine and cosine function calculations can still be understood.

But... what is the regression equation?
Did I study it when I was in college?

Among the forensic doctors present, the highest level of education was a graduate student, while the lowest level was a junior college graduate from the police academy.

This level covers the entire university education level in the domestic mainstream education system.

but……

Did we really learn any regression equations back then?

Probability correction?

Is this probability?

Bullshit.

Lu Chuan talked with great interest, but gradually noticed the confusion in everyone's eyes.

"This... this is probably what it looks like. I will make an appraisal report later, which is legally binding."

"Yeah, okay, in this case, our work here can be considered a big progress."

Although Sun Jian couldn't understand Lu Chuan's calculation process, as long as it was helpful, why would he understand it so clearly?

Immediately, the murderer's physical characteristics were sent to Li Donglin.

"The height of an adult male is most likely between 1.7 meters and 1.8 meters."

This is the conclusion given by Lu Chuan, with a high probability.

Why add a "high probability" conclusion? Because in fact, no one knows what the murderer's circumstances were like at the time.

For example, the murderer's actual height is 1.6 meters, but if he stands on a stool that is 1.7 centimeters high, the result will still be that the murderer will rise between 1.8 meters and 1.9 meters.Or, if the murderer is clearly over [-] meters tall, but happened to be standing in a pit when he killed someone, the above results will also occur.

Everything has a probability, especially murder.

Of course, these are only extremely unlikely possibilities. From the perspective of casting a wide net to replenish fish, this possibility can even be ignored.

"it is good!"

The murderer's body shape has certain characteristic data, which will reduce the workload of the front line by more than one or two points.

This is why front-line criminal police work so hard, but no one ever competes with investigators or forensic doctors for credit.

People who play with technology can sometimes really help the front line a lot.

The source of the corpse is still being further identified, and Lu Chuan's work was indeed completed first.

There is nothing special about the box containing the corpse. It is basically impossible to find clues from the purchase channel of the box.

On the contrary, the information provided by the chain is more important.

Of course not the chain itself, such chains can be obtained anywhere.

The key is the method of linking. The murderer did not use a key, but used a rivet method to kill it with a steel nail.

Why would the murderer do this?
Does the murderer's profession have such characteristics?

In the conference room No. [-] of the Tianzhou City Criminal Investigation Detachment, Li Donglin hosted the first case analysis meeting.

"One of the corpses that have been found in the river has already identified the deceased. This is a major breakthrough. Follow the interpersonal relationships of the deceased and go through them one by one. No detail can be missed."

"Particular attention should be paid to adult males whose height is between 1.7 and 1.8 meters."

"In addition, the time span of this case is very long. The murderer started committing crimes ten years ago and continued until two months ago..."

Having said this, Li Donglin paused slightly.

Regarding the time span when the murderer committed the crime, Li Donglin made a detailed analysis and even asked criminal psychology experts in the province to help.

Generally speaking, the murderer of this kind of serial murder case has an uninterrupted killing process, and relatively speaking, there is a time critical point.

That is to say, there is a critical point in the time interval between the other party's killings, such as one year, two years, or three years, and rarely more than five years.

But this murderer is different.

The most recent body, No. [-], was killed two months ago.

Body No. [-], killed eight months ago.

Body No. [-], a year ago, but less than a year and a half.

Corpse No. [-] is more than five years old and less than ten years old.

Corpse No. [-] is over ten years old.

This is a bit strange. Three of the five corpses were killed in the past year or so.

One was from ten years ago, and the other was from five to ten years ago.

This average time span is completely irregular and does not have the time critical point problem that most serial killers have.

"The murderer is extremely vicious and his killing methods are extremely cruel. Everyone must be extremely vigilant when visiting and investigating."

"In addition, current investigators, forensic doctors and frontline investigators must determine the source of the body as soon as possible and lock down the identity of the deceased."

"In addition, all personnel will be mobilized within ten kilometers of the Wangjia River Basin where the body was found!"

(End of this chapter)