National Forensic Doctor

An Audi A6 with a Beijing A license plate, along with a group of minibuses, quietly drove into the courtyard of the Changyang City Criminal Police Detachment.

Huang Qiangmin got off his A6 first, followed by Jiang Yuan and others who got off the minibus.

Speaking of which, the comfort level of the A6 during long-distance travel is not as good as that of the modified Coaster. Not only is the comfort of the seat inferior, but when Costelli is tired from sitting, he can stand up and take two steps, twisting his butt and twisting his waist in a posture that cannot be matched even if the car is extended countless times.

However, A6 has special meaning to Huang Qiangmin, especially the A6 with Beijing brand, it is like LV presbyopia wearing on Huang Qiangmin.

Even if it's greasy, it's still trendy.

Yu Wenwen greeted Huang Qiangmin, Jiang Yuan and others with a smile, and then said with a smile: "We have worked overtime to complete the trace evidence that Jiang Yuan is going to do. We have indeed found something, really. It's a coincidence, hahahaha—"

"Can you confirm the source of the corpse?" Jiang Yuan got out of the car and moved his hands and feet, and was quite surprised to hear this.

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

Yu Wenshu clapped his hands with a recalling expression and said, "Yi 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 generally remember the case, and the logic and evidence of how to solve the case are all imprinted in their minds. But if you want to say what everyone said when they met, they can also retell the original words exactly. , I have to say that it is really a bit scary to listen to Yu Wenshu’s retelling face to face.

"This is the ability of photographic memory." Huang Qiangmin liked it with his real name.

Jiang Yuan also looked at Yu Wenshu up and down. It had to be said that the feeling of having such a skill in the hands of others was really unsettling.

"Our Yuzhi quarrels with my wife and we never lose." Wan Baoming, deputy director of the Changyang Criminal Science and Technology Center, is very technical, and his words make people not sure whether he is complaining.

And he obviously knew Yu Wenshu's itch. Yu Zhi even waved his hands with a little bit of pride and said: "I don't mean anything. I just have a photographic memory of what I see, chat with people, and remember what I said clearly. But if you ask me what I said at that time, I can’t remember the scene clearly, it’s not as good as the kind of photo memory.”

"Do you still have photo memories? Do you remember things like photos?" Liu Wenkai followed, mainly to show his face and make him look familiar.

Yu Wenshu nodded solemnly: "It's not uncommon - when I was studying, some people could just glance at the tables in the book and redraw them on the notebook. It's not possible for people like us, just If you can read it word by word, you have to understand it after reading it, so that you can draw the relationship diagram. "

"So, we took the exam with such students." Wan Baoming held up Yu Wen's book in a complaining tone.

Yu Wenshu said cheerfully: "We don't take advantage of this kind of exam now. At most, the scores in liberal arts are better. You haven't seen the kind of genius in science who can just look at the geometric diagram and jump out the answer. It's equivalent to, how to say - --"-The answer comes directly to their minds. "

"When a person like this quarrels with his wife, he has no advantage." Huang Qiangmin said with a smile.

"The results are all the same. Those who have a photographic memory, those who remember photos, those who are mathematical geniuses——" Yu Wenshu's face was filled with vicissitudes of life: "They all have to sleep on the sofa!"

"You won the argument, and you want to sleep on the sofa too?" Liu Wenkai lacked experience in this area.

Yu Wenshu nodded solemnly: "You will understand later. She doesn't have to quarrel, she just points out and lets you think about where you went wrong.

To be honest, my memory is so good that I can really recall my mistakes! "

Yu Wenshu was filled with emotion. He looked at Liu Wenkai again, frowned and said, "I remember Wenkai is 40 years old. Are you still so inexperienced?"

Like Wu Junhao, Liu Wenkai, who had just been promoted to the post of assistant subject, touched his forehead helplessly and said: "My that--I may be better at coaxing--

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

Liu Wenkai: "As for me - I didn't often go there before - no, to catch people or something, so I practiced some speaking skills and undercover. When I was working on the front line, Undercover agents, special contacts, etc. are all meant to trick people——"

"Yes, I remember that the Changyang City Public Security Detachment called you here once when they were engaged in cross-regional arrests. You must have been the first to be arrested at that time." Yu Wenshu's memory was awakened, and he quickly began to label Liu Wenkai.

Liu Wenkai quickly modestly said: "Tie for first place. Men dressed as women do not count."

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

Several people were talking and had already entered the office. Yu Wenshu sat down, picked up the tea, and took a few sips.

Wan Baoming is a criminal expert in Changyang City. However, he became famous 20 years ago. The technological iterations in these years cannot be said to be backward.

It can only be said that I have not kept up, but it is possible to have a rough understanding, and it is no problem to have an overview of the whole area, so I can only be the leader of the criminal department, and I can no longer be a technician.

Wanbao Mingqing coughed twice, took out a report from his arms, thought for a moment, and then smiled: "Because we measured more trace evidence points, and measured more compounds, I will directly state the conclusion. Right. The fibrous tissue taken from the body parts has the same fiber structure as the woven bags found at the scene. They are both multi-layer bags made of polypropylene and polypropylene-coated flat yarns. The warp and weft densities are They are both relatively high and are relatively good woven bags. "

Wanbao Ming: "The special thing is that we have determined that the murderer used woven bags from three different manufacturers, one is green and two are blue——"

Wanbao Ming: "In addition, there are some fabric fibers, which should come from the deceased's clothes during his lifetime, including cashmere products and cotton fabrics, which are all natural fibers and relatively complicated. It is difficult to say whether the manufacturer can be confirmed in the end."

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

First of all, there is no machine that can stuff trace amounts of evidence into it and then produce the results - just like other types of DNA tests, poison tests, etc.

Secondly, to detect a trace amount of physical evidence, inspectors need to classify it first to see if it is metal, plastic, paint, rubber, glass, etc. It can be observed under a microscope, or it can be taken with an

For example, after it is subdivided into fibers, the characteristics of the fibers can be further analyzed. Look at its color, composition, and fiber shape at the vertical and horizontal interfaces,

Polarized light characteristics, fluorescence characteristics, infrared spectrum, Raman spectrum, etc...—"

After doing this, it’s time to classify. First, classify whether it is natural or chemical fiber, and then look at whether it is natural or chemical fiber.

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, green hemp, hemp, flax ---" -- If it is another It’s a kind of marijuana. Hey, then we’re back to the marijuana course and let’s see what kind of marijuana 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 guessed and confirmed. If they ultimately want to use it to determine the source of the corpse, they need to go from fiber to material. Explore step by step from material to manufacturer, from manufacturer to consumer.

After walking around for a while, everyone became thinner.

That is to say, there are woven bags on site and can be compared directly, which is relatively simple.

But if you want to finally find consumers through clothes, the difficulty is too high.

Jiang Yuan listened to Wan Baoming's introduction and reached out for a few more reports to read. After a while, he said again: "To put it simply, it is a fiber that is suspected to come from clothing. It is difficult to determine the source - as for the woven bag , what do you think?

Wan Baoming took a sip of tea and said: "The fiber types in the trace evidence can all correspond to the woven bags found at the scene. At present,

There are 6 different woven bags on site. These woven bags come from three different manufacturers, which is actually not normal.

At least it shows that the murderer did not buy the woven bags at that time, but used the stock. "

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

“At present, it seems that it is possible————.

"But the scope is still a bit broad. The body parts must all belong to the same person, right?"

"Two of the corpses were so badly decomposed that no DNA was obtained. The others have been confirmed to be from the same person." Wan Baoming paused.

Then he said: "I'll go back and let others try again."

The latter sentence was purely for Jiang Yuan's sake. Because you are using national-level experts, your professionalism and meticulousness must be at least national-level. Otherwise, if you catch the murderer in the future and find that there are loopholes here, it will be very embarrassing.

Jiang Yuan: "We can try more. We will search the surrounding area again. If the head can be found, this case can at least be solved with skull recovery, but it will take a little long -"

Yu Wenshu responded: "We are already expanding the search area, and the police dog brigade is also coming to support us."

"In this case, there's not much we can do." Jiang Yuan said difficult words, but his tone and expression were still positive. He turned around and said: "Well, let me judge a relatively accurate death." Time, let’s go in two steps.”

"good."

"One is based on the time of death, let's look for nearby surveillance cameras to see if there is any harvest. It would be best if the other party used a covered truck or a tricycle to transport the body."

Yu Wenshu smiled: "Don't tell me, there are quite a few similar cases."

Jiang Yuan smiled with his remaining emotional intelligence and continued: "Monitor and collect as much as possible. If you have any questions, I can do further optimization here."

Yu Wenshu: "Okay!"

Jiang Yuan: "Second, let's scan the missing persons according to the time of death. I see that the DNA report has also come out. If the victim is a female, you can zoom in a little bit and look at the province-wide data one week before death. Is there anyone who can compare to female missing persons?"

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

Thinking about the subsequent investigations, personnel costs and case handling expenses, all are based on this point. Ordinary forensic doctors do not dare to give too specific time of death, and they will give it very leniently, but then It has lost its meaning.

It was here in Jiangyuan that Yu Wenshu could feel the heat of his youth, that strong feeling of being protected and taken care of, which enveloped him inexplicably.

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