Chapter 290: Short Hair with a Scar

Everyone has things to do, only Wang Bo, who has neither work nor work assigned, so he silently took out his phone, took a few photos, and sent them to the work group.

The trace inspection, on-site investigation, and other technicians in the work group were all curious to death.

At this time, seeing that there was news, and it was a newly discovered fingerprint, they instantly entered the shock mode.

Having fingerprints means that it is possible to directly lock the murderer. It is inevitable that people are surprised that such important evidence was not discovered, and discovered.

Li Yuanliang: 【Is the fingerprint found by Jiang Yuan? Where is the position, is it that we can't scan it? @Wang Bo】

Wang Bo then sent another photo of the fingerprint position. That is the bottom of the window frame, which should be considered a relatively obvious position. Li Yuanliang: 【This was not scanned? Are you kidding?】

Wang Bo: 【It is a quickly pressed fingerprint, especially inconspicuous. Jiang Yuan used laser printer toner, mixed with magnetic powder, and brushed it several times before brushing it out. I also felt very magical when I first saw it. It is different from ordinary brushing powder.】

Wang Shouming: 【Can brushing powder also brush out flowers?】

Wang Bo: 【It is that the first time there was no performance, then the second time a little bit of fingerprint marks appeared, it needs to be illuminated by an investigation lamp, then focus on brushing two or three times, and then gradually become obvious. First time seeing such brushing powder.】

Normal fingerprint brushing is that powder is sprinkled on it, fingerprints appear, sometimes not very clear, actually it is because the sticky powder is not enough, then add some powder, and then it is about the same.

The fingerprint brushed with printer toner mixed with magnetic powder needs to be brushed three or four times, four or five times, and it is still a gradually clear mode. This is something Wang Bo has neither seen nor learned.

The work group of Changyang City quieted down.

After a good while, someone spoke again: Li Yuanliang: 【I asked an expert, saying that laser printer toner has a light degree close to copper powder and aluminum powder, the specific gravity is between aluminum powder, copper powder and magnetic powder, and has magnetic properties slightly weaker than magnetic powder, mainly its own electrostatic magnetism. In addition to being used alone, it can also be mixed with magnetic powder in different proportions according to seasonal and environmental changes, and timely compensates for the loss of small particles of magnetic powder in long-term brushing... what the hell, still need to brush according to the season and environment?】 Wang Shouming: 【Fake, right? If it is so useful, just match it in our investigation box, is it necessary?】 Li Yuanliang: 【I repeat the expert's words, it is not what I said, advance explanation. The original words are: not an expert, using printer toner will only be counterproductive. Those who can skillfully use toner, you kneel down and shout long live.】

Wang Shouming: 【Where is there an expert who speaks like this.】

Li Yuanliang: 【My uncle said it.】

Wang Shouming: 【...... Uncle is really right, long live long live long live!】

Wang Bo's forehead was already swollen.

Although the people chatting in the work group are colleagues, and there are leaders in it, Wang Bo still couldn't help but ponder the words and speak.

Wang Bo: 【When I was in school, the professor taught not to brush multiple times, saying that one or two brushes are satisfied, if not satisfied, multiple brushes are easy to drag and damage the lines that have appeared, or present pitch black, only in a very dry environment, is it allowed to brush multiple times...】

Wang Shouming: 【Xiaobo, although I don't understand either, I will say one sentence, theory is something, just listen to it, watch the big guys do things, shouting 666 is the safest.】

Li Yuanliang: 【Don't teach young people bad. This problem can be explored, I also checked some information just now...

Jiang Yuan's method, the proportion configuration is very complex, don't think about it, I actually think the key to the problem is, why did he brush the windowsill multiple times, is it because he found something? @Wang Bo】;

Wang Bo: 【Found footprints.】

Wang Bo then described the situation after Jiang Yuan arrived. The technicians and non-technicians in the work group were silent. The footprints Jiang Yuan found did not need to be brushed; it should be said that it was there, but the footprints everyone saw were too many, and no one thought of looking down from the window.

The second floor of the color steel room is about 3 meters high. Normal investigation personnel go to the second floor room for investigation, and will not think that the murderer's route of leaving is jumping out of the window.

Why bother? Up to now, there is no report of eyewitnesses, the front door is open, the murderer walked in normally, smashed the cashier to death normally, why not walk the door normally? Li Yuanliang: 【There must be an accident. Otherwise, if the murderer walked the door normally, he would

Why bother? So far, there have been no reports of witnesses. The main gate was wide open, the killer walked in normally, and normally beat the cashier to death. Why not walk out the door normally? Li Yuanliang: "There must have been an accident. Otherwise, if the killer had walked out the door normally, he wouldn't have left fingerprints or footprints, at least making it impossible for people to distinguish."

Gao Long: "Beating the cashier to death must have been the accident. Normally, he probably wouldn't have thought about beating someone to death."

Li Yuanliang: "Emotions were too agitated?"

Wang Shouming: "Emotional agitation is normal. Anyone participating in a robbery would have their adrenaline secretion accelerated. Being used to it would be too terrifying. There shouldn't be any such 'Liangshan' types left now."

"Xiaobo." He Guohua shouted, waking Wang Bo, who was immersed in his phone.

"Hey, I'm checking what's being said in the group." Wang Bo quickly gave his master a smile.

He Guohua said seriously, "Take Brother Jiang to the investigation vehicle and turn on the computer."

"Okay. Should I use the backend?" Wang Bo asked hurriedly.

Jiang Yuan said himself, "I want to compare fingerprints on the computer."

He had just marked the feature points on his phone, but it didn't match. After refreshing and taking photos again, he was ready to use the computer to compare. After all, screen size is still very important; looking at fingerprints on a phone, many details are not very clear.

Wang Bo agreed hurriedly and led Jiang Yuan down from the color steel room.

The two walked slowly along the acrylic plank bridge. After walking a distance, Wang Bo couldn't help but whisper, "Brother Jiang, that... why did the killer jump down from the second floor?"

Jiang Yuan heard deep curiosity in Wang Bo's tone. Jiang Yuan glanced at Wang Bo and thought for a moment, then said, "Can we wait until we find the killer to ask him?"

"This... can it only be asked?" Wang Bo felt itchy all over and was a little disappointed. Can a case solved by asking be called a detection? Jiang Yuan could perceive the awkwardness in Wang Bo and smiled, asking, "Do you have to guess?"

Wang Bo was indeed excited: "What do you guess is the reason?"

"Too lazy to guess. Not interested." Jiang Yuan said bluntly, "I'm willing to do the technical work. To me, finding footprints, matching fingerprints, or finding DNA is more interesting."

Wang Bo said "Ah": "That can't be right, even if we are in technical work, but just like this, but just like this..."

He said it twice, probably using polite language to express: Just this?

Jiang Yuan said, "Liu Chu, Liu Jinghui from the Provincial Bureau, probably fits your requirements better. He likes to play with deduction."

"He's the type who purely guesses... no, the type who purely deduces, I don't like that either." After Wang Bo finished, he was a little embarrassed and hurriedly said, "I'm not talking about work, nor am I saying his method is bad, it's just a difference in personal interests."

Jiang Yuan expressed understanding. People are diverse. After doing and seeing many cases, one can better appreciate this. Some people like power, some like money, some like women, some like to abuse dogs, some like to play with deduction, or like Wang Bo, like technology and deduction...

Jiang Yuan had a major breakthrough in the case, and Wang Bo's feeling toward Jiang Yuan was different now.

Talking like this, Wang Bo gradually opened up and couldn't help but say, "I think using only technology to solve cases also has limitations."

Jiang Yuan said, "That's for sure."

Wang Bo: "I mean, if you hadn't judged the killer's movement line, or if he had jumped down and landed not on soil, but on clean concrete, leaving no footprints, or if he had left them and cleaned them up, would our case have been unable to proceed? Thinking about it this way, it feels so difficult."

Jiang Yuan shook his head: "It would become difficult, but it wouldn't be unable to proceed."

"Is there another way to do it?"

"Of course. The most direct plan is to scan the entire room. Take all the footprints and compare them with the movement line of the footprints outside."

"This workload is very large."

(Line 290-56 is a continuation of 290-55)

Jiang Yuan glanced at Wang Bo and said, "So many people are idle, what are you afraid of regarding workload? When doing homicide cases, as long as there is a plan, manpower expenditure is the detachment leader's business."

"Ah... this..." Wang Bo had to admit that this plan really might have blundered the killer out.

Don't look at the many footprints in the construction site; only a minority would enter the cashier's office, probably only about 10 people's footprints. Finding all these people's footprints and mapping them out on paper to draw the movement line, there would certainly be some footprints with very low suspicion and some with higher suspicion. In this way, the scope of the killer could also be narrowed to a certain extent.

Jiang Yuan continued: "In this way, checking the footprints in reverse, it is possible to find a set of footprints starting from below the cashier's window. In this way, the fingerprints at the window still have a certain probability of being discovered."

Wang Bo nodded subconsciously. Indeed, using this method, as long as it is detailed enough, finding footprints below the cashier's window would certainly raise suspicion.

"If the footprints in the room are properly organized, it is also possible to find the killer's movement line. On the contrary, it will take some effort to discover the killer's fingerprints." Jiang Yuan was also summarizing. Wang Bo deeply agreed: "Probably many people don't know the plan of mixing magnetic powder with ink powder."

"Think on the bright side, if the killer had worn gloves at the time, he wouldn't have left fingerprints either."

"Right, then what to do?"

"So mastering a little more technology is never wrong." Jiang Yuan paused, thinking about it himself, and said, "If we can determine the footprints, looking for the killer's means of transportation when he came might also have a breakthrough."

Wang Bo was stunned: "Oh right, before we couldn't find the transportation, it was because there was no handle. Now that there are footprints, we can look for the transportation. Should this be reported to the leaders?"

"You make the report." With new clues, it is natural to continue the investigation.

Of course, Jiang Yuan is more concerned about fingerprints now.

However, just as he said, there are so many people, checking along the transportation, getting more clues and evidence is never a bad thing. Arriving at the investigation vehicle at the construction site entrance, Jiang Yuan got the computer, connected to the intranet, and started checking the fingerprints himself.

Around the same time, more criminal police and technicians also started moving.

Yu Wenshu was indeed interested in the new clues and investigation direction. Fingerprints don't necessarily yield results, so he was certainly willing to expand the investigation direction.

The walkie-talkie left in the investigation vehicle also rang from time to time. Inside and outside the construction site, everything was in operation at this time.

Inside were technicians fixing footprints, and outside were criminal police running around looking for transportation.

Not far from the construction site, there were gradually bustling streets and shops. Places not covered by police surveillance video, places that were avoided, might just be covered by someone's video, but this requires asking and checking one by one.

Jiang Yuan pulled out the fingerprints, carefully made feature points, and then carefully compared them...

"Hmm, it's still because the screen is too small." Not long after, Jiang Yuan matched the fingerprints.

Unsurprisingly, the suspect Qi Penghu is a fugitive, once imprisoned for theft and robbery, and also participated in a black society organization case. In the photo, Qi Penghu has short hair, a short nose, a big mouth, rough skin, and a knife scar on the corner of his eye...

The fierce appearance is the type that makes it difficult to find a normal job.

Jiang Yuan submitted it in the system backend, stretched, and took the opportunity to look around.

The construction site is called "Binhu Spring Greening Landscape Project," located in the old city of Changyang City. There are many bustling areas nearby. Passersby shopping or local residents taking a walk would curiously look at the police and police cars coming in and out. Some who were bold and bored would stand not far away to watch.

Jiang Yuan turned his head and saw a man with a special appearance, about thirty years old, with short hair, a short nose, a big mouth, rough skin, and a knife scar on the corner of his eye...

Jiang Yuan lowered his head again, silently looking at the photo on the notebook, regretting that he came too

hurriedly this time, and didn't call Mu Zhiyang to come along.