civil forensic

Chapter 182

Using fingerprints to solve the backlog of cases is already Jiang Yuan's old line.

The plaque of the second-class hero is still drying at the door of the house, and it is polished by the old man every day.

After so many accumulated fingerprints, Jiang Yuan felt that there was a comparison condition when he saw the blood fingerprints on the leather jacket.

This is a kind of self-confidence based on personal ability.

First, the clarity of blood fingerprints is usually acceptable.Of course, this fingerprint was found on a leather jacket, so the clarity is slightly affected, but it is still in much better condition than most sweat latent fingerprints.

Second, although the fingerprint is only one-third the size and lacks a center, it has fingertips.This condition is a very personal condition.

For normal trace inspection, if you see that the fingerprint has no center point, or the center point is blurred, just give up.Because the fingerprint of this condition is very difficult to check.

But for Jiang Yuan, as long as he can correctly judge the position of the center point, and the lines around the center point are clear, he is sure to make such a fingerprint.The success rate is only slightly lower than a fingerprint without a center point.

If it is an actual case, the better the fingerprint conditions, the easier it is to make it.

But after doing so many backlogs, one of the most obvious knowledge has long been revealed: for backlogs, the better the fingerprints are, the less meaningful they are.

A fingerprint that anyone can check is like a licking dog that licks anyone it sees. Its owner does not exist.

Of course, the difficulty of fingerprints in front of you is also obvious.

Jiang Yuan downloaded the fingerprint image to the computer, looked at the image, and did not act immediately.

At this time, a system message flashed in front of his eyes:

……

Mission: Break through the mystery

Task content: Crack the 405 Xu Hai case

……

Jiang Yuan checked, the 405 Xu Hai case was exactly the case he had just selected.

In this way, you can save your worry, and you don't have to think about whether you should choose another case if you encounter difficulties in this case.

Just focus on breaking up the case.

Jiang Yuan rubbed his hands, following the old rules, no matter how good the fingerprints are, first P the picture.

The old saying is good: PS rolls three rolls, and the beauty is unstable.

After the fingerprints pass through the P picture, it is like the leader drinking Moutai, after all, he wants to show his true colors.

Jiang Yuan didn't ask for much. Normally, he would draw 15 feature points on a complete fingerprint, but he would draw 8 fingerprint points on one-third of the fingerprints, and there would be a basis for comparison.

The old version of the high-performance mainframe rumbled.

Wu Jun raised his head when he heard the voice: "Have you selected the case?"

"405 Xu Hai case." Jiang Yuan said.

"You tell me about the condition of the corpse, and I'll know." Wu Jun stood up and lit a cigarette by the way.

Jiang Yuan directly picked up the main point and said: "The body was found next to the township road in Litang Township. When it was discovered, the body was about 8 meters away from the township road, and there were trees and vines in the middle. The body was highly decomposed, with stab wounds in the abdomen and chest... ..."

"Ah, I see. The deceased was a self-employed man who sold clothes in the market?" Wu Jun brought out a sense of history when he spoke.

Jiang Yuan said "En", and said: "I saw a bloody handprint left on his leather jacket, let's compare it."

"Use fingerprints, that's okay." Wu Jun said, but he still couldn't help it, and said again: "This case is not easy to handle."

"Where was it stuck at that time?" Jiang Yuan was also curious.

Wu Jun didn't answer, but instead asked, "What do you think the nature of this case is?"

Jiang Yuan mainly stared at the fingerprints, but the case was also roughly scanned. After thinking about it, he said, "Block the road and rob? Then escalate to murder?"

"Then why is it 8 meters away from the road? The photos at the scene were specially taken of the vegetation on the side of the road. Take a look and see if it is very lush. It is very inconvenient to walk over."

Jiang Yuan looked through the photos on the intranet again, that is, the photos of the homicide case, and the transcription was relatively clear.It can be seen that there are a lot of plants two or three meters away from the township road. If you want to walk 8 meters away, you can't walk over it directly, you have to squeeze in. If you threaten with a knife, it is easy to go wrong.

Of course, the part that went wrong might also be the reason for the upgrade?
Jiang Yuan didn't want to understand too much, but he understood what Wu Jun meant, and said, "So, at the beginning, you didn't think it was a robbery?"

Instead, Wu Jun shook his head and said, "I think so, and many people think so. But the leader doesn't agree."

"why?"

"If the murder is caused by roadblocking and robbery, the case cannot be solved." Wu Jun spread his hands and sighed again: "It makes sense. Back then, the case was solved with three tricks, one investigation, two rows and three surprises. In this wilderness, it turned into robbery and murder. , the case is too difficult to handle.”

One investigation, two rows and three bursts refer to on-site investigation, queuing up to find out, and surprise interrogation.

This is a criminal investigation method based on a solid social network.

The household registration system after the founding of the People's Republic of China has greatly reduced the mobility of the population. Most of the cases are committed by acquaintances. Through investigation, a satisfactory rate of detection can be obtained.

As for wanderers who are wandering outside, they are usually called blind people by the police system, and they are arrested at every turn for review, interrogation, and repatriation.

Because of this, with the liberalization of social mobility, the working capacity of the police system has been greatly reduced, not to mention social security.

Wu Jun didn't tell Jiang Yuan at all, that is, if there were still a lot of roadblocking and robbery cases back then, the desire to lead the investigation was not so strong.

Jiang Yuan asked curiously: "What did Team Huang say back then?"

"At that time, he happened to be the director of the police station." Wu Jun paused, recalled for a moment, and said: "It should be this case, and the criminal police chief will be replaced."

Jiang Yuan couldn't help but want to gossip: "Is the last captain replaced because of this case?"

"Basically. There were quite a lot of unsolved cases in those years."

Seeing that Wu Jun didn't intend to talk about this topic, Jiang Yuan continued with the case itself and said, "So, the main problem of this case, do you think is the direction?"

"The relationship network of the deceased has been thoroughly investigated, but there are no results." Wu Jun shook his head and said, "You should look for fingerprints carefully, and now you can find something by relying on this."

Random crimes were difficult to investigate back then, and it is even more impossible to investigate now.

In fact, most of the backlog of cases solved in these years is mainly based on fingerprints and DNA, and this is also for a similar reason.

There are many clues that could not be found back then, and even more so after many years.

Jiang Yuan originally expected Master to provide more information.After all, many things are actually not written in the dossier.

What Wu Jun said just now is similar to the abandoned detection direction, which is something that is not in the dossier.

It's just that it doesn't work for the time being.

Jiang Yuan didn't want to think about it anymore, so he turned around and continued to process the fingerprints.

It was like when participating in the provincial fingerprint competition in Changyang.

At that time, there was no one to cooperate with you. It was simply to check the fingerprints.

At that time, half of the province's fingerprint experts were all LV3-level tracers, and they went home with duck eggs.

With just one fingerprint from Jiang Yuan, it was time to get off work.

Wu Jun got up on time and asked Jiang Yuan, "Are you off work?"

"I'm working overtime." Jiang Yuan sighed, took out his phone, and sent a message to his father.

Wu Jun smiled and said: "It's a combination of work and rest. If you have to rest, you should take a rest."

"I interrupted my train of thought." Jiang Yuan shook his head helplessly.

During the province's fingerprint competition, why are fingerprint experts more likely to produce results?The emphasis is on the one hand, and it is also because I can focus on looking at fingerprints without even going home.

Jiang Yuan did not dare to take this blood fingerprint lightly, and it would be most beneficial to return to the state during the fingerprint battle.

(End of this chapter)