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 saw the bloody fingerprints on this leather jacket and felt that there were conditions for comparison.
This is a kind of self-confidence based on personal ability.
First of all, 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 much better than most sweat latent fingerprints.
Secondly, although the fingerprint is only one-third the size and lacks a center, it does have fingertips. This condition is a very personal one.
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 under such conditions are difficult to detect.
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 can confidently make such a fingerprint. The success rate is only lower than that of fingerprints without a center point.
A little bit.
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 fingerprints with better fingerprint conditions are less meaningful.
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 fingerprints in front of you is also obvious.
Jiang Yuan downloaded the fingerprint image to the computer, looked at the image, and did not take action immediately.
At this time, a system message flashed before his eyes:
…
Mission: Solve the mystery
Mission content: Solve the 405 Xu Hai case
…
Jiang Yuan checked and found that the 405 Xu Hai case was exactly the case he had just selected.
This way, you can save your worries, and you don't have to think about whether you should choose another case if you encounter difficulties with 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 P the picture first.
As the old saying goes: If the PS rolls three times, the beauty will not be able to stand still.
After the fingerprints pass through the P picture, it is like a leader drinking Maotai. He always wants to show his true colors.
Jiang Yuan didn't ask for much. Normally, he would draw 15 characteristic points on a complete fingerprint. He would draw 8 fingerprint points on one-third of the fingerprint, which would provide a basis for comparison.
The old version of the high-performance host rumbled.
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 and had stab wounds 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 said "En" and said, "I saw a bloody fingerprint left on his leather jacket. Let's compare it."
"Use fingerprints, that's okay." Wu Jun said, but still couldn't help it, and added: "This case is not easy to handle."
"Where was it stuck?" 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 briefly. After thinking about it, he said: "Road robbery? And then escalated to murder?"
"Then why is it 8 meters away from the road? In the photos of the scene, I took a special photo of the vegetation on the roadside. Take a look and see if it is very lush. It is very inconvenient to walk through it."
Jiang Yuan then looked through the photos on the intranet, which were the photos of the murder case, and the transcription was clearer. It can be seen that there are a lot of plants two or three meters away from the rural road. It is impossible to go eight meters away.
If you walk over directly, you have to squeeze in. If you are threatened with a knife, things can easily go wrong.
Of course, the part that went wrong might also be a reason for upgrading?
Jiang Yuan didn't think too much about it, but he understood Wu Jun's meaning and said: "So, you didn't think it was robbery on the road?"
Instead, Wu Jun shook his head and said, "I think it is, and many people think it is. But the leader doesn't recognize it."
"Why?"
"If robbery leads to murder, this case cannot be solved." Wu Jun spread his hands and sighed: "It makes sense. In those days, 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 would be too difficult to handle.”
One investigation, two platoons, and three surprises refer to on-site investigation, queuing up to find out, 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. Through investigation, a satisfactory detection rate can be obtained.
As for wanderers abroad, they are usually called blind migrants by the police system, and they are easily arrested, examined, interrogated, and deported.
Because of this, with the liberalization of social mobility, the working capacity of the police system has been greatly reduced, let alone social security.
Wu Jun didn't tell Jiang Yuan at all, that is, there were still quite a few cases of roadblock 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?"
"He happened to be the director of the police station at that time." Wu Jun paused, thought about it for a moment, and said, "It should be this case, and he was replaced by the criminal police captain."
Jiang Yuan couldn't help but gossip: "The last captain was replaced because of this case?"
"Absolutely. There were quite a few unsolved cases in those years."
Jiang Yuan saw that Wu Jun had no intention of discussing this topic, so he continued with the case itself and said: "So, the main issue in this case, do you think it is the direction issue?"
"The deceased's relationship network has been thoroughly investigated, but there are no results." Wu Jun shook his head and said: "You should look for fingerprints. This is the only way you can find something now."
Random crimes were difficult to investigate back then, and they are even more impossible to investigate now.
In recent years, most of the backlog cases that have been solved are mainly based on fingerprints and DNA, for similar reasons.
Many clues could not be found back then, and even more so many years later.
Jiang Yuan originally expected his master to provide more information. After all, many things were not written in the file.
What Wu Jun just said is similar to the abandoned detection direction, which is something that is not in the file.
It's just that it doesn't have any effect for the time being.
Jiang Yuan didn't want to think anymore and turned back to continue processing the fingerprints.
Just like when I participated in the province-wide fingerprint competition in Changyang.
At that time, there was no one to cooperate with you. It was just a simple fingerprint check.
At that time, half of the fingerprint experts in the province were all performing fingerprint examination at the LV3 level, and they went home with a record of duck eggs.
With just one fingerprint from Jiang Yuan, the matter was processed until off-duty time.
Wu Jun got up on time and asked Jiang Yuan: "Are you getting off work?"
"I'm working overtime." Jiang Yuan sighed, took out his mobile phone, and sent a message to his father.
Wu Jun smiled and said: "We should combine work and rest. Take a break when you need to."
"I interrupted my train of thought." Jiang Yuan shook his head helplessly.
During the province-wide fingerprint competition, why were fingerprint experts more likely to get results? On the one hand, they paid attention to it, and it was also because they could focus on reading fingerprints without even going home.
Jiang Yuan did not dare to take this bloody fingerprint lightly. It would be most advantageous to return to the state during the fingerprint battle.
