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Of the four tasks assigned by Brother Ming, my investigation experiment was the first to be carried out. This was also the most cumbersome experiment I have done in the past two years. Some people may not understand. Isn't it just to confirm whether the suspect is wearing a prosthetic limb? Just find someone to step on it and that's it. How do the people who eat melon know the complexity of this.
First, I need to determine the approximate age range of the suspect. Only by knowing the age group of the suspect can we determine which age group to select as the experimenter.
Although Ming Ge had previously speculated that the suspect was over 40 years old based on his smoking habits, this was only a guess. People are relatively independent individuals, and each person's behavior habits have their own complexity and diversity. For example, for people with fitness habits, many calculation formulas in trace science cannot be applied. Therefore, to draw accurate conclusions, speculation only delineates a range, and supporting evidence requires scientific basis.
In this case, the age can only be determined from the characteristics of the footprints. As a normal person's walking footprint, we only need to select a section of the shoe print, measure the step length, step angle, and step width, and apply the formula to calculate the approximate age. In this case, the suspect's shoe prints cannot form a specific pattern. I can only select some features on the shoe prints for analysis. The most mature research on traces is the wear characteristics of the soles.
We all know that muscle strength develops upwards from adolescence, youth to adulthood. The characteristics of walking during this period are neat steps, strong jumping ability and steady steps. Because the forefoot surface of the foot is much wider than the heel surface, the muscle force acting on the forefoot is more efficient than acting on the entire sole of the foot, and walking is more stable than acting on the heel. After people enter middle-aged and old age, the force gradually shifts backward, the area of ????the forefoot supporting the force decreases, and the heel becomes the main part that supports the force of the human body. Therefore, middle-aged and elderly people have slow gait, weak jumping ability, and reduced walking stability.
Relevant manifestations are: Most of the shoes worn by people in their youth have serious wear on the thumb area. As age increases, the wear on the thumb area changes from obvious to gradually less obvious. After old age, the pattern on the thumb area shows almost no wear. The formation mechanism is basically the same as the wear of the forefoot and heel. In the young and middle-aged stage, the center of gravity of the force is on the forefoot, and in the middle-aged and elderly stages, the center of gravity of the force moves backward. This makes whether the thumb area is worn or the degree of wear depends on the age of the person wearing the shoes. Change forms a certain pattern.
At the same time, no matter whether a person is in the prime of life, middle-aged or old, the position and angle of the feet when walking remain basically unchanged. Therefore, the starting and landing parts of the footprints are relatively stable, and the position and angle reflected by the starting and landing parts have little to do with changes in age.
Therefore, although the wear characteristics of the soles in this case are obvious, we can easily determine the approximate age range of the suspect as long as we find the local characteristics that can reflect the suspect's age group.
After selecting the age group of the experimenter, there is another most critical step, which is to determine the type of foot prosthesis.
Common prostheses on the market can be divided into two categories: one is exoskeleton prostheses, also called shell prostheses, which resemble the shape of the limbs and bear the external force of the prostheses. They have a simple structure, are easy to disassemble, are light in weight, but are superficially It is hard and bulky and can easily cause abrasion to the skin tissue in contact with it. The other type is endoskeletal prostheses, which are supported by tubes similar to bones. They can be easily fixed to the amputation surface when worn. They can be wrapped in sponges and covered with artificial skin. They have good appearance and can adjust the limb curves. In many cases, they can look fake but real. The structure is complex and the price is relatively high.
The two types of prostheses can be divided into full prostheses (the amputation surface is above the knee joint) and half prostheses (the amputation surface is below the knee joint) depending on whether the wearer retains the knee joint.
Whether the endoskeletal prosthesis is full or half, due to its overall structure and flexible rotation axes designed at the joints, when walking with such a prosthesis, the gait and stride characteristics of the shoe print are generally the same as those of normal people.
The difference between full-type and half-type shell prostheses is relatively large. Because the "half shell" retains the knee joint, the shoe prints formed during walking are relatively complete and smooth, while walking with a "full shell" makes the shoe prints appear bulky and mechanical.
Combining the above circumstances, I finally identified the experimenters as men between the ages of 35 and 50 who wear shell prostheses.
The experiment was divided into two groups, with an age difference of 5 years, and the types of prostheses were divided into "half-shell" and "full-shell".
That is, the "half-shell" prosthetic group for those aged 35, 40, 45, and 50 years old, and the "full-shell" prosthetic group for those aged 35, 40, 45, and 50 years old.
Select 3 people from each age group, walk 100 meters, and take the 20-meter shoe print in the middle as a reference.
After careful comparison, I finally concluded that the suspect is a man about 45 years old, wearing a "half-shell" prosthetic legof men.
When I printed this conclusion on A4 paper, I was already exhausted and exhausted.
If the suspect is wearing a "full-shell" prosthetic leg, his gait will be significantly different from that of a normal person due to the inflexibility of his knee joint when walking. However, if you want to see the difference in the walking posture of a "half-shell" prosthetic leg, The possibility is not very high. If you zoom in on the surveillance video in the summer, there might be some hope; but in the winter, the clothes are already bulkier and it would be even harder to see the difference.
Seeing me walking into his office listlessly, Fat Lei hurriedly asked, "What's wrong with you? Why do you look like an eggplant beaten by frost?"
"After two days of busy work, using the connections between the municipal government, district government, municipal bureau, and branch bureaus, the conclusion reached is of no use at all."
"Well, who says it's not the case? There is no working video surveillance within 1 kilometer of Nanling Community. Now I can only pull up the video on the main road of the community. But this road is full of people coming and going, forty or fifty. The average year-old backpack has one every few seconds. We don¡¯t have any directional things now. Even if the suspect appears in the surveillance video, I can¡¯t recognize who it is. Moreover, there are several unidentified roads near the community. The surveillance covers the alley, so if the suspect enters the scene from the alley, then my side is basically out of luck."
"The video has no clue, the experiment has no clue, then the only thing left is to see what happens with the criminal police team."
¡°Don¡¯t think about it, I learned about the visit from Brother Ming half an hour ago.
"The deceased Zhu Wen was an honest man in the community. He lived alone and had no extra house to rent. He basically didn't interact with others. He lived by doing odd jobs more than ten years ago. Later, his son became rich and had a lot of income. With the security, his working life has ended. In these years, he got up at 6 a.m. every morning to do morning exercises. After breakfast, he would watch others playing cards in the community, play chess with neighbors in the afternoon, play Tai Chi in the evening, and then eat dinner and go to bed. This happens every day, 365 days a year. The criminal police team retrieved his mobile phone call records, except 10086, which is his son¡¯s mobile phone number. And he only made 10 calls in half a year, 6 of which were fraudulent calls, and the remaining 4 All calls were made to his son."
"Social relations are so simple?"
"How can this be called simple? It's not good at all. I quickly browsed the video surveillance at the main road intersection. Zhu Wen only goes out twice a day. He leaves at 6 a.m., finishes his morning exercise at 8 a.m., buys groceries at the intersection of the community and goes home; Go out at 7 o'clock in the evening, come back at 8:30, and spend the rest of the time in the community. Think about it, who can such a person offend?"
"Is it possible that the suspect and the deceased did not know each other and that he committed the crime randomly?"
"I've thought about this too, but the Criminal Police Team has sorted through all major criminal cases across the country in the past two years, and basically there is no such modus operandi. You said that the suspect was committing a crime for the first time, how could he choose such a moneyless and honest person? Start?"
"Is it possible that you are practicing courage?"
"My sister, have you been infected by Ye Qian? You are also a trace inspection engineer after all. Why do you open your mouth and come here?"
"Well, looking at it this way, this case is basically unsolvable"
"Why are you so anxious? Isn't there a steel code on the cigarette box? If we can find out which cigarette stall the suspect bought the cigarettes from, wouldn't we be able to follow the clues and find some clues?"
"My brother Lei, you are also a senior evidence cameraman after all. Can you have some common sense? How many cigarettes does a cigarette stall sell in a day? Even if we find the area where cigarettes are sold, what do you think the boss can recall? Also, if the cigarettes are sold What if the suspect bought it in advance or in strips? How long do you need to retrieve the video? What if there is no surveillance around the small stall? "
"You can't always think the worst about things."
"Brother, of the cases we have encountered over the years, which one can be successfully solved?"
"Well¡¡"
"We must have overlooked something."
"Yes, there is also the deceased's son. He hasn't woken up yet. Think about it, the deceased lived alone. Where is his wife? Why don't they live together? Is there some secret that we don't know?"
"Oh, I hope so" (Remember the website address: www.hlnovel.com - Didn't finish reading? Add this book to your favoritesI'm a member and bookmarked this chapterCopy the address of this book and recommend it to your friends for pointsChapter error? Click here to report
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