Everyone had something to do, except Wang Bo, who neither had a job nor was assigned to work, so he silently took out his mobile phone, took a few photos, and sent them to the work group.
The trace inspection, field survey and other technicians in the work group have already been dying of curiosity.
At this time, I saw the news that fingerprints were newly discovered, but I instantly entered the shock mode.
The presence of fingerprints means that it is possible to directly identify the murderer. It is surprising that such important evidence has not been found or even found.
Li Yuanliang: [Did Jiang Yuan find the fingerprint? Where is it that we can’t scan? @王波]
Wang Bo then sent another photo showing the location of his fingerprints.
That's the bottom of the window frame, which should be a relatively obvious location.
Li Yuanliang: [Didn’t you catch this? Are you kidding me?]
Wang Bo: [It is a fingerprint that is pressed quickly. It is not obvious. Jiang Yuan used toner from a laser printer, mixed with magnetic powder, and brushed it several times before it came out. When I first saw it, I thought it was very magical. It and
Ordinary powder brushing is not the same.】
Wang Shouming: [Can you create flowers by painting with powder? 】
Wang Bo: [On the first pass, there was still nothing, and then the second pass showed a little bit of fingerprint marks, which needed to be illuminated with a survey light. After two or three more repeated passes, it gradually became obvious. Chapter 2
This is the first time I’ve seen powder like this.]
Normal fingerprint brushing is to sprinkle powder on it and the fingerprint will be revealed. Sometimes it is not clear. In fact, it means that there is not enough sticky powder on it. Then add a little more powder and it will be almost there.
Using printer toner mixed with magnetic powder for fingerprints, you have to swipe it three, four, or five times, and the pattern will gradually become clearer. This is something Wang Bo has neither seen nor learned.
The work group in Changyang City became quiet.
It took a while before someone spoke again:
Li Yuanliang: [I asked an expert and they said that laser printer toner has a lightness close to copper powder and aluminum powder, a specific gravity between aluminum powder, copper powder and magnetic powder, and has slightly weaker magnetism than magnetic powder.
It is mainly due to its own electrostatic properties. In addition to being used alone, it can also be mixed with magnetic powder in different proportions according to seasonal and environmental changes, which can promptly make up for the loss of small particles of magnetic powder during long-term brushing... What the hell?
Should it be displayed according to the season and environment?】
Wang Shouming: [It’s fake. If it’s so useful, just put it in our survey box. As for that?]
Li Yuanliang: [I will repeat the expert’s exact words. I am not the one who said it. Let me explain in advance. The original words of the person are: If you are not an expert, using printer toner will only be self-defeating. For those who can use toner skillfully, you kneel down and shout long live.
That’s it.]
Wang Shouming: [How can any expert speak like this?]
Li Yuanliang: [My uncle said it.]
Wang Shouming: [...Uncle is really right, long live long live long live long live!]
Wang Bo's forehead felt swollen from looking at it.
Although the people chatting in the work group were all colleagues and there were leaders in it, Wang Bo couldn't help but think carefully about his words.
Wang Bo: [When I was in school, the professor taught me not to brush the display multiple times. He said that if you are satisfied with the display once or twice, if you are not satisfied, brushing the display multiple times will easily drag the lines that have already appeared.
Destroyed, or appear pitch black, only in extremely dry environments are multiple brushing allowed...]
Wang Shouming: [Xiaobo, although I don’t understand it either, but let me tell you, just listen to the theory. To see the boss doing things, calling 666 is the safest way.]
Li Yuanliang: [Don’t teach young people bad things. This issue can be discussed. I just checked some information... The method used by Jiang Yuan is very complicated in proportion and configuration. Don’t think about it. I think the key to the problem is
, why did he refresh the window sill many times, and what did he find? @王波]
Wang Bo: [Footprints were found.]
Wang Bo then described the situation after Jiang Yuan's arrival.
Both technicians and non-technicians in the work group were silent.
The footprints discovered by Jiang Yuan did not need to be displayed. It should be said that they were there. However, there were so many footprints that everyone saw that no one even thought of looking down from the window.
The second floor of the color-coated steel house is similar to a normal second floor, with a height of about 3 meters. Normal investigators who go to the second-floor room to investigate would not think that the murderer would jump out of the window.
Why bother? So far, no witnesses have been reported. The door was open. The murderer walked in normally and smashed the cashier to death. Why didn't he just walk through the door normally?
Li Yuanliang: [An accident must have happened. Otherwise, if the murderer walked through the door normally, he would leave neither fingerprints nor footprints, at least it would be indistinguishable.]
Gao Long: [It was an accident to beat the cashier to death. Normally, one would not think of beating someone to death.]
Li Yuanliang:【Are you too excited?】
Wang Shouming: [It is normal to be emotional. Anyone who participates in robbery must have accelerated adrenal secretion. It would be too scary to get used to it. There should be no such Liangshan people now. 】
"Xiao Bo." He Guohua shouted, waking up Wang Bo who was immersed in his mobile phone.
"Hey, let me see what the people in the group say." Wang Bo quickly smiled at his master.
He Guohua said seriously: "Take Brother Jiang to the survey vehicle and turn on the computer."
"Okay. Are you using the backend?" Wang Bo asked quickly.
Jiang Yuan himself said: "I want to compare fingerprints on the computer."
He just marked the feature points on his mobile phone once, but failed to match. After refreshing the display again, he took pictures again and was ready to use the computer to compare.
After all, the size of the screen is still very important. When looking at fingerprints on a mobile phone, many details cannot be seen clearly.
Wang Bo responded quickly and took Jiang Yuan down to the colored steel room.
The two walked slowly along the acrylic board bridge. Wang Bo walked a while and couldn't help but whispered: "Brother Jiang, um, why did the murderer jump from the second floor?"
Jiang Yuan heard strong curiosity from Wang Bo's tone.
Jiang Yuan glanced at Wang Bo and thought about it: "Can we wait until we find the murderer before questioning him?"
"This...can't we just ask?" Wang Bo felt itchy all over and a little disappointed. Can the case he asked about be called a detection?
Jiang Yuan could sense the awkwardness in Wang Bo's body, smiled, and asked, "Do you have to guess?"
Wang Bo was really excited: "What do you think the reason is?"
"I'm too lazy to guess. I'm not interested." Jiang Yuan said bluntly, "I just want to do technology. For me, finding footprints is more interesting than fingerprints or DNA."
Wang Bo said "Ah": "No, even if we are in the technical field, this is it, but this is it..."
He said it twice, most likely using polite language: That's it?
Jiang Yuandao: "Liu Jinghui and Liu Chu from the provincial department are probably more in line with your requirements. He likes to play reasoning..."
"He's the kind of pure guesser... No, the kind of pure reasoning, I don't like him either." After Wang Bo finished speaking, he felt a little embarrassed and said hurriedly: "I'm not talking about work, nor am I saying that his methods are not good.
Well, it’s just that personal interests and hobbies are different.”
Jiang Yuan expressed his understanding that people are diverse. The more you do cases and watch them, the more you can understand this. Some people like power, some like money, some like women, and some
People like Japanese dogs, and some people like to play reasoning, or like Wang Bo, who like technology and reasoning...
Jiang Yuan made a big breakthrough in the case. Wang Bo felt different when he looked at Jiang Yuan again.
While talking now, Wang Bo gradually relaxed and couldn't help but say: "I think there are limitations if we simply use technology to solve crimes."
Jiang Yuandao: "That's for sure."
Wang Bo: "What I mean is that if you hadn't judged the murderer's movement, or if he jumped and landed on a clean cement floor instead of land, without leaving any footprints, or if he had left
If it is cleared directly, will our case not be able to continue? Thinking about it this way, it feels very difficult."
Jiang Yuan shook his head: "It will get harder, but it won't make it impossible."
"Is there any other way to do it?"
"Of course. The most direct solution is to scan the entire room. Take out all the footprints, and then compare them with the movement of the footprints outside."
"This is a lot of work."
Jiang Yuan glanced at Wang Bo and said: "So many people are idle, what's the workload to worry about? When doing murder cases, as long as there is a plan, manpower expenditure is the responsibility of the detachment leader."
"Ah...this..." Wang Bo had to admit that this plan really might bring out the murderer.
Despite the large number of footprints on the construction site, only a few people would enter the cashier's office, probably only about 10 people.
Then find the footprints of these people, draw a map on paper, and draw the movement lines. There will definitely be a few footprints with a low degree of suspicion, and a few footprints with a high degree of suspicion. In this case, it is also
It can narrow down the scope of the murderer to a certain extent.
Jiang Yuan continued: "In this case, if you check the footprints backwards, you may find that there is a set of footprints starting from below the teller's window. In this case, there is still a certain probability that the fingerprints at the window will be discovered."
Wang Bo nodded subconsciously. Indeed, if you use this method, as long as you are careful enough, you will definitely be suspicious if you find footprints under the teller's window.
"If the footprints in the room are sorted out carefully, it is possible to discover the murderer's movement. On the contrary, it will take a lot of effort to discover the murderer's fingerprints." Jiang Yuan himself also concluded.
Wang Bo deeply agrees: "Probably many people don't know how to mix magnetic powder with toner."
"Looking on the bright side, if the murderer had been wearing gloves, he wouldn't have been able to leave any fingerprints."
"Yes, what should we do?"
"So it's always good to master a little more technology." Jiang Yuan paused, thinking about it himself, and said: "If we can determine the footprints, we can also find the means of transportation when the murderer came here, and there may be a breakthrough."
Wang Bo was stunned: "Yes, I couldn't find transportation before because I didn't have a handhold. Now that I have footprints, I can find transportation. Should I report this to the leader?"
"Let me call you and report it." If there are new clues, it is natural to investigate them.
Of course, Jiang Yuan is more concerned about fingerprints now.
However, as he said just now, there are so many people. It is not a bad thing to follow the transportation and get more clues and evidence.
When the survey vehicle arrived at the entrance of the construction site, Jiang Yuan got a computer, connected to the intranet, and checked the fingerprints himself.
At about the same time, more detectives and technicians also started moving.
Yu Wenshu is indeed very interested in new clues and investigation directions.
Fingerprints are not guaranteed to yield results, and he is definitely willing to expand the direction of the investigation.
The walkie-talkie left in the survey vehicle also beeped twice from time to time.
Everything inside and outside the construction site was now in operation.
Inside are technicians who are fixing the footprints, and outside are criminal police officers running around looking for transportation.
Not far from the construction site, there are increasingly prosperous markets and shops. The places that are not covered by the police surveillance videos and are being avoided may be covered by someone else's video. However, this requires a family.
Check out the home inquiry.
Jiang Yuan pulled out the fingerprints, carefully made characteristic points, and then compared them carefully...
"Well, it's because the screen is too small." It didn't take long for Jiang Yuan to match the fingerprint.
Not surprisingly, the suspect Qi Penghu is a fugitive who has been sentenced for theft and robbery, and was also involved in gang organization cases...
Qi Penghu in the photo has short hair, a short nose, a big mouth, rough skin, and knife marks at the corners of his eyes...
With a fierce appearance, he looks like it would be hard to find a normal job.
Jiang Yuan made a submission in the background of the system, stretched out, and looked around.
The construction site is called "Binhu Spring Greening Landscape Project". It is located in the old town of Changyang City. There are many bustling areas nearby. People passing by shopping or local residents walking around will be curious to see what is going in and out here.
The police and police cars, as well as some brave but bored ones, just stood nearby and watched.
Jiang Yuan turned around and saw a man with a special appearance, about thirty years old, with short hair, short nose, big mouth, rough skin, and knife marks at the corners of his eyes...
Jiang Yuan lowered his head again and silently glanced at the photos on his notebook. He regretted that he came in too hasty this time and didn't even call Mu Zhiyang over...
