Chapter 677 There is no fingerprint of the owner
In terms of skeletal identification and analysis, Lu Chuan is worthy of being the leading expert in the provincial department.
The Beizhou City Criminal Investigation Detachment only made some identifications in terms of gender, age, and identity comparison.
But Lu Chuan is different.
Every wound, every crack, every scratch on the skeleton has a corresponding identification and analysis result.
Based on the shape, size and number of these wounds, it was determined that there were at least three murderers at the scene.
And generally determined the scope of the murder weapon used by the murderer.
From the perspective of skeletal identification and analysis, the general situation of the crime scene has been restored to a certain extent.
In addition to some things that appear on the surface, it is also very helpful in portraying the criminal behavior and psychological behavior of the murderer.
First of all, it can be judged that the murderer is extremely cruel.
Especially the scars left on Skeleton No. 3 can prove that the murderer treated human life with indifference.
There is a high probability that there will only be one murder in this kind of person.
When most people kill someone for the first time, unless they have a particularly unforgettable hatred, they will not act particularly harshly or use particularly cruel methods.
Only if you kill too many people and have no respect for human life will you end up like what Lu Chuan found.
Creating scars on the thighs, deliberately slicing the muscles, and the distance is as long as 10 centimeters. It will definitely not cause death of the victim in a short time, but it can serve the purpose of torture.
The cash on the deceased was not missing, and there were no transfer records during the period of death, so it was impossible for the other party to seek money.
Then why did the murderer use such cruel methods on the deceased?
The previous investigation results have basically confirmed that the three discovered victims and the two missing persons have no enemies.
To commit such a ruthless act without any grudge shows that the suspect’s psychology is extremely distorted.
Killing can no longer satisfy his perverted psychology, and torturing the victim in the process seems to be a very common thing.
"In addition, besides these, everyone, look here."
What Lu Chuan operated the projector to enlarge was the photo of Skeleton No. 3.
Only this time the photo is no longer of the legs, but of the sternum.
“Look here, everyone, this is a photo of the left rib and behind the sternum.”
“Black spot?”
Wang Song had sharp eyes and saw it all at once.
The other member in the group, named Chen Zhiguo, stood up!
Incredibly shouted: "Gunshot wound!"
Gunshot wound?
The expressions of everyone else, including Li Donglin, changed.
"Old Chen, what's going on?"
Li Donglin looked at Chen Zhiguo and asked.
Chen Zhiguo, who had calmed down, slowly sat down and explained: "I handled a similar case 10 years ago."
"When the victim was found, it was also a skeleton. Similar black spots were found on the chest and ribs of the skeleton.”
“I didn’t know what happened at the time, and the case was never solved.”
"Three or four years later, another case implicated the murderer of that case."
"It turned out that the other party had killed the victim with a shotgun, and those black spots were the sand left by the shotgun bullets. "
Lu Chuan nodded after hearing Chen Zhiguo's judgment.
He thought that no one at the scene knew what these black spots were, but he did not expect that Chen Zhiguo had seen them.
You must know that if Lu Chuan did not have the spot detection skills rewarded by the system, he would not know how these black spots were caused.
"Brother Chen is right."
"These black spots are indeed gunshot wounds."
"After discovering these black spots, I conducted experiments on these black spots and determined that there were Nitrification reaction. "Nitrification reaction is an important factor in determining whether to shoot or not in criminal investigation techniques.
The reason for this reaction is that the bullet gunpowder contains nitrate chemicals.
Within a certain environmental range, nitrate compounds will remain for a long time after shooting.
So as long as the police collect these residues for testing, they can draw corresponding conclusions.
The adhesion ability of this nitrate compound is very strong.
If the murderer has fired a gun, even taking a shower within a short period of time will not be able to remove the adhesion of this substance.
“And judging from the location of these black spots, they are all concentrated on the back of the sternum and inside the ribs.”
"There are also some black spots on the spine, which shows that the murderer shot from behind."
"Judging from the depth of these black spots, we can initially determine the firearm used by the other party and the distance from which the shot was fired."
"Homemade shotgun, homemade bullets, shooting distance within five meters."
"Wait a minute," Wang Song pointed at the photo: "Xiao Lu, don't say the types of bullets and guns. , shooting distance..."
Seeing that some people didn't quite understand why they made such a judgment, Lu Chuan continued to explain.
"Because the range of these black spots is not large, the bullets used in homemade shotguns are filled with steel balls and the like."
"The farther the distance after the shotgun is fired, the larger the spread area of the steel balls in the bullet."
“The area of scars on the victim’s chest is concentrated on the left chest. After measurement, the distance is about five meters.”
“After the identification and analysis of the skeleton, we can basically determine the murderer. Some have knives, some have sticks, and some have hammers.”
“Finally, they have homemade shotguns.”
"So, at present, the murderer may be four people."
"This probability is relatively high."
"In addition, I have made some contact with the police here at Beiliangshan Police Station."
“The residents near Beiliang Mountain live relatively scattered, and they used to make a living by hunting. Although hunting has been banned in recent years, many people have stopped hunting.”
“ Over the years, the Beiliangshan Police Station has issued many orders to confiscate shotguns.”
"However, some people did not turn in all the shotguns."
"In addition, it is not ruled out that there are still people living in the mountains."
Lu Chuan's identification and analysis of the skeletons not only restored the results to a certain extent to the scene and further narrowed down the identity of the suspect.
In addition, there have been great changes in the methods and ideas of the serious crime team in investigating cases.
After all, ordinary murder cases and gun-related cases are on completely different levels.
"Very good, are there any other discoveries?"
Lu Chuan nodded: "There is one more important clue."
Skeletal identification and analysis is only one aspect of the work that Lu Chuan does.
The most important clue on his side is actually the fingerprints collected from the backpacks and items found at the scene.
“Before we came, the Beizhou City Criminal Investigation Detachment collected half a fingerprint from the items in the backpack.”
"They did not succeed in the comparison at that time. The fingerprint had already been compared three nights ago. It has no meaning. It belongs to one of the deceased."
"I checked it in the system , the fingerprints of the three victims and the two missing female students are in the system."
"But..."
Lu Chuan flipped the projection: "Inside the items in the backpack, I also found. Half a vague unfamiliar fingerprint was found.”
“And this fingerprint was not matched to the target person in the system.”
"It is very likely that it was left by the murderer!"
(End of this chapter)