civil forensic

Chapter 962: Boundary (asking for monthly ticket)

Chapter 962: Boundary (asking for monthly ticket)

An Audi A6 with a Beijing A license plate, along with a line of minibuses, drove into the yard of the Changyang City Criminal Police Detachment in a low-key manner.

Huang Qiangmin was the first to get out of his A6, followed by Jiang Yuan and others who got out of the minibus.

To be honest, the comfort level of the A6 during long-distance travel is not as good as that of the modified Coaster. Not only are the seats less comfortable, but when you get tired of sitting in the Coaster, you can stand up and walk a few steps, twisting your hips and waist, which is something that even a sedan that is lengthened countless times cannot compare to.

However, A6 has special meaning to Huang Qiangmin, especially the A6 with Beijing license plate, which is like the LV old flower worn by Huang Qiangmin, even if it is greasy, it is still fashionable.

Yu Wenshu greeted Huang Qiangmin, Jiang Yuan and others with a smile, and then said with a smile: "We have already worked overtime to complete the trace evidence that Jiang Yuan wanted to collect. We did find something. It was really a coincidence, hahahaha..."

"Can you confirm the source of the corpse?" Jiang Yuan got out of the car and stretched his arms and legs. He was quite surprised to hear this.

Yu Wenshu smiled and waved his hands, saying, "That's not the case. Ah, I said coincidence because I remembered something. I don't know if you still remember the first case we worked on together, the 326 kidnapping and murder case, which was the case of Tan Yong, the one who dug his own basement to imprison people. The first breakthrough at that time was proposed by Jiang Yuan, who used the trace evidence method and found a place to hide the body."

Yu Wenshu clapped his hands, put on a reminiscing expression, and said: "I remember what I said at the time. Jiang Yuan used trace evidence to find a place where the body was hidden. It makes sense!"

"That's really a coincidence!" Jiang Yuan and Huang Qiangmin were stunned and laughed in unison.

They all roughly remember the case, the logic and evidence of how to solve the case, those are all things imprinted in their minds, but if you ask them what they said when they met, and they can still repeat the original words word for word, I have to say... listening to Yu Wenshu's retelling face to face is really a bit scary.

“This is the ability to have a photographic memory.” Huang Qiangmin gave a thumbs up under his real name.

Jiang Yuan also looked Yu Wenshu up and down. It must be said that the feeling of having this kind of skill in someone else's hands is really unpleasant.

"We Yuzhi have never lost an argument with our wives." Wan Baoming, deputy director of the Changyang Criminal Science and Technology Center, has a very technical air, and people are not sure whether what he says is a complaint or not.

And he obviously knew what Yu Wenshu was tickling. Yu Zhi even waved his hand with a little bit of pride and said, "My problem is nothing. I just have a photographic memory and remember what I said when I chat with people. But if you ask me about the scene at that time, I can't remember it clearly. It's not as good as the memory of photos."

"Is there any memory based on photographs? You remember things like taking photos?" Liu Wenkai came along, mainly to show his face and make himself familiar.

Yu Wenshu nodded seriously: "It's not uncommon... When I was in school, some people could just glance at the tables in the book and quickly draw them out on their notebooks. People like us can't do that. We can only read them word by word, and after reading them, we have to understand them, so that we can draw the relationship diagram."

"So, when we took the exams back then, we were taking them together with students like this." Wan Baoming picked up a handful of Yu Wen's book with a complaining tone.

Yu Wenshu said cheerfully: "In this kind of exam nowadays, we don't have any advantage. At most, we have better scores in liberal arts. Have you ever seen those science geniuses who can look at a geometry diagram and directly jump out the answer? It's like, how should I put it...the answer comes directly in their mind."

"People like this have no advantage when they quarrel with their wives," Huang Qiangmin said with a smile.

"The results are all the same. Those with photographic memory, those with photo memory, those with math genius..." Yu Wenshu's face was full of vicissitudes: "They all have to sleep on the sofa!"

"Even if I win the argument, I still want to sleep on the sofa?" Liu Wenkai lacks experience in this area.

Yu Wenshu nodded seriously: "You will understand later. She can avoid quarreling, just point her finger and let you figure out where you made a mistake. To be honest, her memory is so good that she can really remember where you made a mistake!"

Yu Wenshu was filled with emotion. He looked at Liu Wenkai again, frowned, and said, "Wenkai is about 40 years old, I think. Still so inexperienced?"

Liu Wenkai, who had just been promoted to the position of deputy section chief like Wu Junhao, touched his forehead helplessly and said, "Well... I might be better at coaxing..."

"How did you coax her?" Several married men present focused their eyes on Liu Wenkai.

Liu Wenkai: "As for me... I used to go to prostitutes often... No, I went to catch prostitutes and so on, so I practiced some words and so on, and I was also an undercover agent. When I was working on the front line, I was an undercover agent, contacting special agents and so on, and I had to coax people..."

"Yes, I remember that the Changyang City Security Detachment conducted cross-regional prostitution arrests and called you over once. You were the first one to be arrested at that time." Yu Wenshu's memory was awakened, and he quickly began to label Liu Wenkai.

Liu Wenkai quickly said modestly: "We are tied for first place. Men dressed as women don't count."

Yu Wenshu's memory was awakened for the second time, and he said a little uncomfortably: "Let's talk about our case... Baoming, tell me about it."

As they talked, they entered the office. Yu Wenshu sat down, picked up the tea, and drank two sips.

Wan Baoming is a criminal science expert in Changyang City, but he became famous 20 years ago. It cannot be said that he has fallen behind in the technological iterations in recent years, but it can be said that he has not kept up. However, he can have a rough understanding of it and have an overall view of the situation. Therefore, he can only be the leader of the criminal science department and can no longer be a technician.

Wan Baoming coughed twice, took out a report from his pocket, thought for a moment, and then smiled, "Because we have tested more trace evidence points and more compounds, I will just tell you the conclusion. The fiber tissue taken from the body has the same fiber structure as the woven bag found at the scene. They are both multi-layer bags, woven with polypropylene and polypropylene coated flat yarn, with high warp density and weft density, and are relatively good woven bags."

Wan Baoming: "What's special is that we have determined that the murderer used woven bags from three different manufacturers, one is green, two are blue..."

Wan Baoming: "In addition, some fabric fibers should come from the deceased's clothes during his lifetime, including cashmere products and cotton fabrics, which are all natural fibers. They are relatively complex, and it is hard to say whether the manufacturer can be confirmed in the end."

The examination of trace evidence is relatively complex, or in other words, it is composed of a whole set of complicated procedures.

First of all, there is no machine that can insert trace evidence and then produce results - just like other types of DNA tests, toxicology tests, etc.

Secondly, to detect a trace amount of physical evidence, the inspector needs to classify it first to see whether it is metal, plastic, paint, rubber, glass, etc. It can be observed under a microscope, or it can be photographed with an X-ray machine, or a trace amount can be taken as a solvent. In short, it must be subdivided before further testing can be done.

For example, once it is subdivided into fibers, the characteristics of the fibers can be further analyzed. Look at its color, composition, fiber morphology at the vertical and horizontal interfaces, polarization characteristics, fluorescence characteristics, infrared spectrum, Raman spectrum, etc.

After doing all this, it is time to classify, first into natural or chemical fibers, and then see which type of natural or chemical fiber it is.

If it is a natural fiber, it can be cotton, linen, silk, wool, etc. If it is a kind of hemp, it can be ramie, jute, hemp, hemp, flax... If it is a kind of hemp, then we are back to the hemp course and see what kind of hemp it is...

For the police, determining the type of fiber is far from the end, because what the fiber was used for still needs to be speculated and confirmed. If they eventually want to use it to determine the source of the corpse, they need to explore step by step from fiber to material, from material to manufacturer, and from manufacturer to consumer.

After a stroll, I feel thinner.

That is to say, there are woven bags on site, so we can make a direct comparison, which is relatively simple.

But it is too difficult to find consumers through clothes.

Jiang Yuan listened to Wan Baoming's introduction, and then reached out for a few more reports to read. After a while, he said, "To put it simply, it is the fibers that are suspected to be from clothing, but it is difficult to determine the source... What do you think about the woven bags?"

Wan Baoming took a sip of tea and said, "The types of fibers in the trace evidence can all correspond to the woven bags found at the scene. So far, there are 6 different woven bags at the scene. And these woven bags came from three different manufacturers, which is actually not normal. At least it means that the murderer did not buy the woven bags at the time, but used the stock."

"So the murderer or the victim's work, or the first scene, does require woven bags?" Jiang Yuan translated Wan Baoming's words.

"At the moment, it seems like this is possible...right?"

"But that's still a bit broad. The body parts are definitely from the same person, right?"

"Two of the body parts were too badly decomposed to obtain DNA. The others have been confirmed to be from the same person." Wan Baoming paused, then said, "I'll go back and have someone try again."

The latter sentence was purely for Jiang Yuan's sake. Because you have hired a national-level expert, your professionalism and meticulousness must also be at least national-level. Otherwise, if the murderer is caught in the future and it is discovered that there are loopholes here, it will be a huge embarrassment.

Jiang Yuan: "We can try a few more times. Search the surroundings again. If we can find the head, we can at least use skull reconstruction to solve this case. It just takes a little too long..."

Yu Wenshu replied: "We are already expanding the search area, and the police dog team has also been sent to provide support."

"In this case, there is not much we can do." Jiang Yuan said with embarrassment, but his tone and expression were still positive. He turned around and said, "How about this, I will determine a relatively accurate time of death, and we will proceed in two steps."

"it is good."

"One is to look for surveillance cameras nearby based on the time of death to see if there is anything we can find. It would be best if the other party used an open truck or tricycle to transport the body."

Yu Wenshu smiled and said, "Don't tell me, there are many similar cases."

Jiang Yuan smiled with his remaining emotional intelligence and continued, "Collect as much surveillance as possible. If you have any questions, I can make further optimizations on my side."

Yu Wenshu: “Okay!”

Jiang Yuan: "Second, let's scan the missing persons based on the time of death. I see the DNA report is out too. If the victim is a female, we can expand the scope a little bit and see if there are any female missing persons in the province who match the time of death."

"No problem." Yu Wenshu felt Jiang Yuan's rare emotional intelligence and felt warmed. Because although the plan proposed by Jiang Yuan was simple, and could even be said to be a conventional criminal police investigation idea, there was a very core point in it, which was to use a relatively accurate time of death as the dividing point.

Think about the many subsequent investigations, personnel costs and case-handling expenses, all of which will be based on this point. Ordinary forensic doctors dare not give a very specific time of death. If they do give one, it will be very broad, but then it will lose its meaning.

It was only here with Jiang Yuan that Yu Wenshu could feel the warmth of his youth. That strong feeling of being protected and cared for inexplicably enveloped him.

(End of this chapter)