Chapter 181: Old Business

Solving backlogged cases through fingerprints has become Jiang Yuan's specialty.

The plaque of the second-class hero is still hanging in front of the house, and it is polished by my father day by day. After doing so many backlog fingerprints, Jiang Yuan felt that there were conditions for comparison when he saw the bloody fingerprints on this leather jacket.

This is a kind of self-confidence based on personal ability. First, the clarity of blood fingerprints is usually okay. 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.

Secondly, although the fingerprint is only one-third the size and lacks the center, it has the fingertips. This condition is a very personal condition. In normal fingerprint inspection, if you see that the fingerprint has no center point, or the center point is blurry, just give up. Because fingerprints in this condition are difficult to detect.

But for Jiang Yuan, as long as he could correctly judge the position of the center point and the lines around the center point were clear, he would be confident to make such a fingerprint. The success rate is only slightly lower than a fingerprint without a center point. If you are doing a current case, naturally the better the fingerprint conditions are, the easier it will be to make it.

But after doing so many backlogged cases, the simplest knowledge has long been revealed: for the backlogged cases, the better the fingerprint conditions, the less meaningful the fingerprints are. A fingerprint that can be checked by anyone is like a licking dog that licks every person it sees. Its owner does not exist. Of course, the difficulty of the fingerprint in front of you is also obvious. Jiang Yuan downloaded the fingerprint map to the computer, looked at the picture, and did not take action immediately. At this time, a system message flashed before his eyes: Mission to solve the mystery Mission content: Solve the 405 Xu Hai case

Jiang Yuan checked and found that the 405 Xu Hai case was the case he had just selected. In this way, you can save your worries. You don't have to think about whether you should choose another case if you encounter difficulties in this case. Just concentrate on solving this case.

Jiang Yuan rubbed his hands. The old rule is, it doesn't matter whether the fingerprint condition is good or not, just take pictures first. As the old saying goes, if the PS rolls three times, the beauty will not be able to stand still.

When the fingerprint passes through the p-map, it's like the leader drank Maotai. He wants to show his true colors after all. Jiang Yuan didn't want much. Normally, he would draw 15 characteristic points on a complete fingerprint. He would draw 8 fingerprint points on one-third of the fingerprint, and then he would have a basis for comparison.

The old version of the high-performance console rumbled to life. Wu Jun heard the voice and raised his head: "Have you chosen the case?" "405 Xu Hai Case." Jiang Yuandao.

"Tell me about the condition of the body and I will know." Wu Jun stood up and lit a cigarette. Jiang Yuan directly picked up the key points and said: "The body was found beside the rural road in Litang Township. When it was found, the body was about 8 meters away from the rural road, with trees and vines blocking the middle. The body was highly decomposed, with severe pain in the abdomen and chest... "Ah, I understand. The deceased was a self-employed person who sold clothes in the market?" Wu Jun spoke with a sense of history. Jiang Yuan grunted and said, "I saw a bloody fingerprint on his leather jacket. Let's compare it." "Use fingerprints, that's okay." Wu Jun said, but he still couldn't help it, and added: "This case is not easy to handle." "Where was it stuck at the time?" Jiang Yuan was also curious.

Wu Jun did not answer, but asked: "What do you think the nature of this case is?

Jiang Yuan mainly stared at the fingerprints, but he also scanned the case roughly. He thought about it and said: "Road robbery? And then escalated to murder?" Then why 8 meters away from the road? Photos of the scene, I took a special photo of the vegetation on the roadside. Take a look and see if it's very lush and it's very inconvenient to walk there. "

Jiang Yuan then looked through the photos on the intranet, which were photos of the backlog of murder cases, and the transcriptions were clearer. It can be seen that there are a lot of plants two or three meters away from the rural road. If you want to get to 8 meters away, you can't walk directly past it. You have to squeeze in. If you force it with a knife or ribs, things will easily go wrong. Of course, the part that went wrong may also be a reason to upgrade.

Jiang Yuan didn't really want to understand, but he understood what Wu Jun meant and said, "So, you didn't think it was robbery on the road?" Wu Jun shook his head instead and said, "I think it is, many people think it is. But the leader doesn't admit it. "Why? "

"If the robbery leads to murder, the case cannot be solved." Wu Jun spread his hands and sighed; "It makes sense. Back then, solving the case was still three steps, one investigation, two rows and three surprises. In this wilderness, it turned into robbery and murder. The case is too difficult. One investigation, two rows, and three surprises refer to on-site investigation, queuing up, and surprise interrogation. This is a criminal investigation method based on a solid social relationship network.

The household registration system after the founding of the People's Republic of China has greatly reduced the mobility of the population; most cases are committed by acquaintances, and through investigation, a satisfactory detection rate can be obtained. As for wanderers who are wandering abroad, they are usually called blind migrants by the police system. They are easily arrested for review, interrogation, and deportation. 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 one thing, that is, there were still quite a few cases of roadblocks and robberies back then, and the leader's desire to solve them was not that strong.

Jiang Yuan asked curiously, "What did Captain Huang say back then?"

At that time, he happened to be the director of the police station. Wu Jun paused, thought about it for a moment, and said: "It should be this case, the criminal police captain was replaced.

Jiang Yuan couldn't help gossiping. "The previous captain was replaced because of this case." "That's about right. There were quite a lot of unsolved cases in those years."

Jiang Yuanbei Wu Jun didn't want to talk about this topic, so he continued with the case itself, saying: "So, do you think the main problem of this case is the direction?" "The deceased's network of relationships has been almost thoroughly investigated, but there is no result. Wu Jun shook his head and said: "You should look for fingerprints. Now you can only rely on this to find something."

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

In recent years, most of the backlog cases that have been solved are actually based on fingerprints and DNA, and the reason is similar. Many clues could not be found back then, and many years later, it is even more impossible to investigate.

Jiang Yuan originally expected the master to provide more information. After all, many things are not actually written in the files. What Wu Jun just said, similar to the abandoned direction of investigation, belongs to things that are not in the files. It's just that it can't play any role for the time being.

Jiang Yuan didn't want to think about it anymore, so he turned around and continued to process fingerprints. It was just like when he participated in the provincial fingerprint campaign in Changyang.

At that time, no one cooperated with you. It was just a simple fingerprint check. If you found it, you got it. If you didn't find it, you were done. At that time, half of the provincial fingerprint experts in the province were level 3 trace detection experts, and they went home with a duck egg record. Jiang Yuan processed one fingerprint until the end of the get off work time. Wu Jun got up on time and asked Jiang Yuan "Are you off work?"

"I worked overtime." Jiang Yuan sighed, took out his mobile phone, and sent a message to his father. Wu Jun smiled and said, "It's a combination of work and rest. Take a break when you need to."

"I interrupted my train of thought." Jiang Yuan shook his head helplessly. During the provincial fingerprint campaign; why are fingerprint experts more likely to achieve results? Paying attention is one aspect, and it is also because they can focus on fingerprints without even going home.

Jiang Yuan did not dare to take this blood fingerprint lightly. It was most beneficial to return to the state during the fingerprint campaign.