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

Chapter 677 No Master’s Fingerprints

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 was different.

Every injury, 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 the scope of the murder weapon used by the murderer was generally determined.

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.

Gunshot wound?

The previous investigation results have basically determined that the three discovered victims and the two missing persons have no enemies.

Wang Song had sharp eyes and saw it all at once.

The expressions of everyone else, including Li Donglin, all changed.

There is a high probability that there is only one murder case for this kind of person.

Another member of the team named Chen Zhiguo stood up!

He shouted in disbelief: "Gunshot wound!"

Only this time the photo is no longer of the legs, but of the sternum.

"Besides, besides these, please look here."

"Old Chen, what's going on?"

Li Donglin looked at Chen Zhiguo and asked.

"Look here, everyone. This is a photo of the left rib and behind the sternum."

To commit such a ruthless act without any grudge shows that the suspect's psychology is extremely distorted.

So why did the murderer use such cruel methods on the deceased?

"Black spots?"

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.

Only if you kill too many people and have no respect for human life will you be like Lu Chuan discovered.

Killing can no longer satisfy his perverted psychology, and torturing the victim in the process seems to be a very common thing.

What Lu Chuan operated the projector to enlarge was still the photo of Skeleton No. 3.

When most people kill someone for the first time, unless they have particularly unforgettable hatred, they will not act particularly harshly or use particularly cruel methods.

Creating scars on the thighs and deliberately slicing the muscles with a distance of up to 10 centimeters will certainly not cause the death of the victim in a short period of time, but it can serve the purpose of torture.

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, but the case has never been solved."

"Three or four years later, another case involved the murderer of that case."

"Only I found out that the other party shot the victim with a shotgun, and those black spots were the marks left by the sand from 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 didn't 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 was nitrification reaction on them." Nitration 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.

Therefore, 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 means the murderer was shot in the back."

"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 gun was fired."

"Homemade shotgun, homemade bullets, shooting distance within five meters."

"Wait a minute," Wang Song pointed at the photo: "Xiao Lu, don't mention the types of bullets and guns, but the 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 the homemade shotguns are filled with steel balls and the like."

"The farther away the shotgun is after it is fired, the greater 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 approximate distance is about five meters."

"After the identification and analysis of the skeleton, we can basically determine the murderer. Some were holding knives, some were holding sticks, and some were holding hammers."

"Finally, they have homemade shotguns."

"So, at present, the murderer may be four people."

"The probability is relatively high."

"In addition, I made some contact with the police here at Beiliangshan Police Station."

"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 families did not turn in all their 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 skeleton not only restored the scene to a certain extent, but also 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 completely different levels.

"Very good, any other discoveries?"

Lu Chuan nodded: "There is another most important clue."

Skeleton identification and analysis is only one aspect of the work that Lu Chuan does.

The most important clue on his side was actually the fingerprints collected from the backpack 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 in the system and found that the fingerprints of the three victims and the two missing female students were in the system."

"but……"

Lu Chuan flipped the projection: "Inside the items in the backpack, I also found half a vague unfamiliar fingerprint."

"And this fingerprint was not matched to the target person in the system."

"It's very likely that it was left by the murderer!"

(End of this chapter)