Chapter 418 Human Experience of Injury
The information a corpse can bring to solve a case is far greater than ordinary people imagine.
Some people say that corpses can talk, and from a certain perspective it is true.
In most cases, in addition to providing some basic information such as time of death and manner of death, corpses can also feed back information about the murderer to a certain extent.
Such as a knife wound.
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.
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 provides 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.
But 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 a serious injury. Loss of hearing or vision can be considered a serious injury.
In addition to the above injury identification, this branch also derives a corpse injury identification.
This is part of the field survey. 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 very powerful."
"Teacher Lu, do you have a specific calculation method?"
A forensic doctor asked, this is a good time to learn this. Hands, wouldn’t it be nice to be able to pretend like this when I go back?
Lu Chuan nodded: "This is true. The angle of the knife changes through a sine function, and is calculated through the empirical regression equation, and then corrected using probability methods..."
The forensic doctors have just started. I was still listening to it with gusto. After all, those who were capable of forensic medicine said that those who were able to do so were all college graduates.
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?
The highest academic level among the forensic doctors present was a graduate student, while the lowest level was a junior college graduate from the police academy.
This level covers the entire university degree level in the domestic mainstream education system.
But...
Did we really learn any regression equations back then?
Probability correction?
Is this probability?
That’s nonsense.
Lu Chuan talked with great interest, but gradually noticed the confusion in everyone's eyes.
"This... it probably looks like this. I will make an appraisal report later, which is legally binding."
"Yeah, okay, in this case, we will The work can be considered to have made a big progress.”
Although Sun Jian didn’t understand Lu Chuan’s calculation process, as long as it was helpful, why did he understand it so well?
Immediately, the physical characteristics of the murderer were sent to Li Donglin.
"The height of an adult male is most likely between 1.73 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 actual height of the murderer is 1.6 meters, but if he stands on a stool that is 15 centimeters high, the result will still be that the murderer will be between 1.73 and 1.8 meters tall. Or, if the murderer is clearly over 1.9 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.
"Okay!"
The murderer's body shape has certain characteristic data, which will not only reduce the workload for the front line.
This is why frontline criminal police work so hard, but no one ever takes credit from investigators or forensic doctors.
People who play with technology can sometimes really help the front line a lot.
The origin of the corpse is still being further identified, and Lu Chuan's work was indeed the first to be completed.
The box containing the corpse has no specificity. It is basically impossible to find clues from the purchase channel of the box.
On the other hand, 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 did the murderer do this?
Does the murderer’s profession have such characteristics?
Li Donglin hosted the first case analysis meeting in the No. 4 conference room of Tianzhou City Criminal Investigation Detachment.
“One of the corpses that have been found in the river has already confirmed the identity of the deceased. This is a major breakthrough. Follow the interpersonal relationships of the deceased, one by one, and no one can be missed.”< br>
"Especially focus on adult males, between 1.73 and 1.8 meters tall."
"In addition, the time span of this case is very long. The murderer started committing crimes ten years ago and continued until two years ago." Months ago..."
At this point, Li Donglin paused slightly.
As for 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 latest corpse, No. 5, was killed two months ago.
Corpse No. 1, killed eight months ago.
Corpse No. 2, a year ago, but less than a year and a half.
Corpse No. 3 is more than five years old and less than ten years old.
Corpse No. 4 is over ten years old.
This is a bit strange. Three of the five corpses were killed in the past year or so.
One is from ten years ago, and the other is 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 the killing method is extremely cruel. Everyone must be highly vigilant when conducting investigations."
"In addition, the investigation, forensic doctors and frontline personnel must determine the source of the body as soon as possible and lock in 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)