civil forensic

Chapter 300
Everyone has something to do, except Wang Bo, who has neither job nor appointment, so he silently took out his mobile phone, took a few photos, and sent them to the work group.

The trace inspection and field survey technicians in the work group were already curious to death.

At this time, when I saw the news, I still found a fingerprint, but I entered the shock mode in an instant.

With fingerprints, it means that it is possible to directly identify the murderer. Such important evidence has not been found, and it is very surprising that it has been found.

Li Yuanliang: [Did Jiang Yuan find the fingerprints?Where is it that we can't scan? @王波]

Wang Bo then sent another photo of the location of the fingerprints.

That is the bottom of the window frame, which should be considered a relatively obvious position.

Li Yuanliang: [Isn't this scanned?Kidding? 】

Wang Bo: [It's a fingerprint that was pressed quickly, and it's not very obvious. Jiang Yuan used laser printer toner, mixed with magnetic powder, and swiped it several times before it came out.When I first saw it, I also thought it was amazing, it is not the same as ordinary powder. 】

Wang Shouming: [Can you paint flowers with powder? 】

Wang Bo: [The first pass still shows nothing, and then the second pass reveals a little bit of fingerprints. It needs to be illuminated with a search light, and after two or three repeated passes, it gradually becomes more obvious.First time seeing such paint. 】

Normal brushing of fingerprints means that the powder is sprinkled on, and the fingerprints show up. Sometimes it is not clear, but in fact, the powder is not sticky enough, so add a little more powder on it, and then it is almost the same.

The fingerprints mixed with printer toner and magnetic powder have to be printed three or four times, four or five times, and the pattern is still gradually clear. This is something Wang Bo has neither seen nor learned.

The work group in Changyang City fell silent.

After a while, someone spoke again:

Li Yuanliang: [I asked an expert, and they said that laser printer toner has a lightness close to that of copper powder and aluminum powder, its specific gravity is between aluminum powder, copper powder and magnetic powder, and it has slightly weaker magnetism than magnetic powder. The main reason is its own electrostatic magnetism. In addition to being used alone, it can also be mixed with magnetic powder in different proportions according to seasons and environmental changes. Should it be displayed according to the season and environment? 】

Wang Shouming: [It’s fake, if it’s so useful, just add it to our survey box, as for it? 】

Li Yuanliang: [I'll repeat the original words of the experts, I didn't say it, let me explain in advance.The original words of people are: If you are not a master, using printer toner will only be self-defeating. If you can use toner proficiently, just kneel down and shout long live. 】

Wang Shouming: [Where is there an expert who talks like that. 】

Li Yuanliang: [My uncle said it. 】

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

Wang Bo's forehead was swollen from looking at it.

Although all the chatterers in the work group were colleagues, and there were leaders in it, Wang Bo still couldn't help but think carefully about his words when speaking.

Wang Bo: [When I was in school, the professor taught me not to swipe the display multiple times. He said that it is okay to swipe the display once or twice. If you are not satisfied, swipe the display many times. Destroyed, or appear pitch black, only in an extremely dry environment, multiple brushes are allowed...]

Wang Shouming: [Xiaobo, although I don't understand, let's say something, just listen to the theory, and watch the boss do things, it's safest to call 666. 】

Li Yuanliang: [Don't teach young people badly.This question can be discussed, I just checked some information... The method used by Jiang Yuan, the ratio configuration is very complicated, don't think about it, I think the key to the problem is why he swiped the window sill many times , What did you find? @王波]

Wang Bo: [Found footprints. 】

Wang Bo then described the situation after Jiang Yuan arrived.

Both technicians and non-technical workers in the work group were silent.

The footprints discovered by Jiang Yuan do not need to be displayed. It should be said that they are there, but everyone has seen too many footprints, and no one even thinks of looking down from the window.

The second floor of the color steel house is similar to the normal second floor, with a height of about 3 meters. Normal investigators go to the room on the second floor to investigate, and they will not think that the way the murderer left is to jump out of the window.

Why bother?So far, no witnesses have been reported, the door is open, the murderer walked in normally, smashed the cashier to death normally, why not walk through the door normally?
Li Yuanliang: [There must have been an accident.Otherwise, if the murderer walked through the door normally, he would leave neither fingerprints nor footprints, at least it would be impossible to distinguish. 】

Gao Long: [The killing of the cashier was probably an accident.Normally, they shouldn't even think about killing people. 】

Li Yuanliang: [Too excited? 】

Wang Shouming: [Emotional agitation is normal. Anyone who participates in a robbery will have adrenal gland secretion speed up. It's too scary to get used to it. There should be no such Liangshan people now. 】

"Xiao Bo." He Guohua yelled, waking up Wang Bo who was immersed in the phone.

"Hey, let me see what the group said." Wang Bo quickly smiled at his master.

He Guohua said solemnly: "Take Brother Jiang to inspect the car and turn on the computer."

"Okay. Are you using the background?" Wang Bo asked hastily.

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

He just marked the feature points on his mobile phone once, but there was no comparison. After swiping the display again and taking pictures again, he was ready to use the computer to compare.

After all, the size of the screen is still very important. When looking at fingerprints with a mobile phone, many details are not clear.

Wang Bo responded quickly and took Jiang Yuan out of the Caigang room.

The two walked slowly along the acrylic bridge, and Wang Bo couldn't help whispering, "Brother Jiang, why did the murderer jump off the second floor?"

Jiang Yuan heard deep curiosity from Wang Bo's tone.

Jiang Yuan glanced at Wang Bo and thought about it: "We can wait until we find the murderer, and then ask him?"

"This... can only be asked?" Wang Bo felt itchy all over, and was a little disappointed.Can the case found out 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 is the reason?"

"Too lazy to guess. I'm not interested." Jiang Yuan said bluntly, "I'm willing to do technology. For me, finding footprints is more interesting than fingerprinting or finding DNA."

Wang Bo said "ah": "I can't, even if we are doing technology, it's like this, but it's like this..."

He said it twice, most likely explaining it in polite language: That's it?
Jiang Yuandao: "Liu Jinghui Liu Chu of the Provincial Department probably meets your requirements better, he likes to play reasoning..."

"He is the kind of pure speculation... No, I don't like the pure reasoning kind." After Wang Bo finished speaking, he was a little embarrassed, and hurriedly said: "I'm not talking about work, nor is it that his way is not good. Well, it’s just that the hobbies are different in terms of personal interests.”

Jiang Yuan expressed his understanding that there are many kinds of people. He has done more cases and watched cases, and he can understand this better.Some people like power, some people like money, some people like women, 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 looked at Jiang Yuan again, and he felt different.

While talking now, Wang Bo also gradually let go, and couldn't help saying: "We only use technology to solve the case, and I think there are limitations."

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

Wang Bo: "What I mean is, if you hadn't judged the murderer's movement, or if he jumped, the place where he landed was not the ground, but a clean concrete floor, leaving no footprints, or leaving footprints, he If it is cleaned up directly, our case will not be able to continue? Thinking about it this way, I feel very difficult. "

Jiang Yuan shook his head: "It will become difficult, but it won't be impossible."

"Is there any other way to do it?"

"Of course. The most direct solution is to scan the entire room. Take down all the footprints and compare them with the moving lines of the footprints outside."

"It's a lot of work."

Jiang Yuan glanced at Wang Bo, and said: "So many people are idle, what workload is there to worry about, 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 might really bring out the murderer.

Although there are so many footprints on the construction site, there are still a small number of people who will enter the cashier's office. It is estimated that there are about 10 footprints.

Then find out the footprints of these people, draw a picture on paper, and draw the moving 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, the scope of the murderer can also be narrowed to a certain extent.

Jiang Yuan continued: "In this way, if you check the footprints backwards, you may find a group of footprints that started from under the cashier'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 must be suspicious if you find footprints under the teller's window.

"If the footprints in the room are sorted out properly, it is possible to find the murderer's movement. On the contrary, it will take a lot of effort to find out the fingerprint of the murderer." Jiang Yuan himself is also summing up.

Wang Bo is deeply convinced: "Many people probably don't know the solution of mixing magnetic powder with toner."

"On the bright side, if the murderer had worn gloves, he wouldn't be able to leave fingerprints either."

"Yes, what should I do then?"

"So it's always right to master a little more technology." Jiang Yuan paused, thinking about it himself, and said: "If the footprints can be determined, find the vehicle the murderer used when he came, and there may be a breakthrough."

Wang Bo was stunned: "Yes, I couldn't find a means of transportation before, so I didn't have a hand. Now that I have footprints, I can find a means of transportation. Should I report this to the leader?"

"Call and report." There are new clues, so it is natural to investigate.

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

However, just like what he said just now, with so many people, it is not a bad thing to investigate along the means of transportation and get more clues and evidence.

Coming to the survey vehicle at the entrance of the construction site, Jiang Yuan got a computer, connected to the intranet, and checked his fingerprints by himself.

At about the same time, more criminal police and technicians also moved.

Yu Wenshu was really interested in the new clues and direction of investigation.

Fingerprints are not guaranteed to produce results, and he is definitely willing to expand the direction of investigation.

The walkie-talkie left in the survey vehicle rang twice from time to time.

Everything inside and outside the construction site is now in operation.

Inside are technicians who are fixing footprints, and outside are criminal police who are running around looking for vehicles.

Not far from the construction site, there are gradually bustling markets and shops. The places that were not captured by the police surveillance video and the places that were avoided may be covered by someone's video. However, this requires a family Check out the inquiries from home.

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

"Well, it's still because the screen is too small." It didn't take long for Jiang Yuan to match his fingerprints.

Not surprisingly, the suspect, Qi Penghu, is a fugitive who was convicted of theft and robbery, and was also involved in the case of the underworld organization...

Qi Penghu in the photo has short hair, a short nose, a big mouth, rough skin, and knife marks on the corners of his eyes...

With a fierce appearance, it is the kind of appearance that it is not easy to find a normal job.

Jiang Yuan made the submission in the background of the system, stretched his waist, and looked around by the way.

The construction site is called "Binhu Spring Greening Landscape Project". It is located in the old city of Changyang City, and there are many bustling areas nearby. People who pass by and shop, or local residents who walk around, will be curious to see the comings and goings of this place. The police and police cars, as well as some bold and boring ones, stood not far away and watched.

Jiang Yuan turned his head and saw a man with a special appearance, about 30 years old, with short hair, short nose, big mouth, rough skin, and knife marks on the corners of his eyes...

Jiang Yuan lowered his head again, silently glanced at the photos on the notebook, a bit regretful that he came too hastily this time, and didn't call Mu Zhiyang over...

(End of this chapter)