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Seven-year-old adult ¡¤ nine

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    I lit up the cigarette and took a puff: "Male shoe prints are wider and thicker, especially the forefoot, which is generally wider, while women's length-to-width ratio is very coordinated and relatively thin. From this aspect, we can also determine that the suspect is a male."

    "After knowing the gender, we also need to analyze the age. There are very clear sets of footprints in the yard at the crime scene. I can use the stride 4 feature as a basis."

    "Generally speaking, teenagers are in a critical period of growth and development. People grow very quickly, so the stride characteristics have not yet been finalized. Metabolism is strong in youth. When a person walks, the forefoot lands powerfully, and the forefoot of the shoe prints  The pattern is the clearest. In the prime of life, because the body's development has been completed, the center of gravity is tilted backward, making the pattern on the heel of the shoe print clearer than that on the forefoot. Based on the clarity of the pattern, I analyze that the suspect is in his prime."

    "The total length of the shoe print is 25.1 centimeters, which is converted into shoe size 40. By accurately measuring the step length, step angle and step width, and applying the formula, it can be calculated that the suspect is about 35 years old and about 1.72 meters tall.  It is consistent with the result calculated from parallel fingerprints, so this should be the age range of the suspect."

    "Yeah!" Brother Ming nodded in approval, and then wrote the number I reported in his notebook.

    "The above are the basic characteristics of the suspect that I have described. The following is the key point I want to talk about!"

    "What? More?"

    "certainly!"

    "What else happens?"

    Well, the clearest shoe printing photo was transferred out by me!

    "The shoe prints we found at the crime scene had a zigzag pattern, but have you noticed that there are many circular defects in the middle of these zigzag patterns, especially the 'convex' shaped dot marks on the heels and toes of the shoes?  ?¡±

    Hearing what I said, everyone looked at the projector and watched the photo gradually enlarge.

    "It's true!" Ye Qian shouted.

    "This is because the suspect is wearing the cheapest rubber-built foam shoes. The sole craftsmanship of this kind of shoes is very simple and can be mass-produced by ordinary handicraft workshops. Make a mold in advance and leave a mark on the toe and heel.  Two small holes are made, and two chemicals are injected from the holes at the same time. Finally, they are allowed to react on their own in the mold. After the reaction is completed, the mold is broken open and a shoe sole is obtained. Because this process is very rough, the chemical reagents are in the reaction process.  , a large number of bubbles will be produced. These bubbles are reflected on the shoe print as the circular defects I just mentioned, and the 'convex' points at the heel and toe are the foam extrusion injection holes left during the production of the soles.  mark."

    "The sole is produced, and then the upper is sewn on, and the shoe is ready. According to the market situation in our Yunxi City, the price of this kind of shoe will not exceed 50 yuan. And it is not difficult to see from the degree of wear of the sole that this pair of shoes is  The suspect must have worn it for a long time, which shows that the suspect¡¯s living standard is not high.¡±

    As I said this, Brother Ming and the others were all recording carefully.

    "Of course, these are some general conclusions. What I want to say below is a directional result."

    My sudden words made everyone in the conference room raise their heads in shock.

    "What else?" Pang Lei's big, bearded mouth could swallow an ostrich egg.

    "have!"

    ¡°Say it quickly!¡± Fat Lei slapped the tabletop excitedly.

    "As I said just now, the shoe prints left by the suspect at the scene were not disguised, so I found a problem when I measured the step length of his left and right feet."

    "what is the problem?"

    ¡°I found that the length of the step taken by his right foot was five centimeters longer than the length of the step taken by his left foot, which means that the step taken by his left foot was shorter.¡±

    "What's the reason for the short length?"

    "We walk by relying on the action and reaction force between our feet and the ground, and the size of the action determines the length of the steps taken by each of our feet. The reason why the suspect's left foot is short is mainly due to its function  Not strong enough.¡±

    "Excluding leg disabilities, the magnitude of the action force and reaction force depends on the contact area. It is precisely because of measuring this subtle change that I discovered that these seemingly unclear shoe prints are unnoticeable.  The difference.¡±

    ?????????????????????? Two photos of shoe prints cut together were projected on the big screen.

    "These are the shoe prints of the suspect's left and right feet. Please look at the big toe position of the shoe prints. Do you find any differences?"

    "The pattern on the sole of the big toe of the left foot is not very clear, but the one on the right foot is much clearer!" Ye Qian squinted her eyes and expressed everyone's feelings.?¡¯s answer.

    "Yes, to be precise, the force acting on the entire base of the suspect's big toe is not obvious, so the contact area of ??the left foot becomes smaller, resulting in a shorter step length. In other words, the suspect's left foot is too big  The toes are most likely missing or disabled.¡±

    "very good!"

    "sharp!"

    "you win!"

    "Awesome!"

    At the same second, four kinds of admiration came from the conference room.

    "So, my conclusion is as follows: The suspect is a male, about 35 years old, thin, about 1.72 meters tall, the big toe of his left foot is missing or disabled, and his living standard is not very high."

    Brother Ming stopped writing and began to analyze: "According to the information we have now, the deceased has been bedridden all year round, and no one in the village is close to her. Her network of connections is almost zero. Xiaolong analyzed it very carefully just now. One of them  Details: Zhang Qingsheng, the son of the deceased, and the suspect had left the scene of the crime together. This does not rule out the possibility that the suspect was familiar with Zhang Qingsheng. When we investigated the scene, we found that there were items missing from the drawers in the room. Is it possible?  Is it possible that the deceased¡¯s lost items were not valuable, but were important to the suspect? If this is the case, if the suspect is caught stealing, he will have the motive to kill and silence him.¡±

    Brother Ming¡¯s analysis was reasonable and reasonable, and none of us refuted it.

    "So, our next work will be divided into three steps. First, continue to trace the whereabouts of the deceased's son, Zhang Qingsheng; second, comprehensively investigate Zhang Qingsheng's relationship network; and finally, investigate whether the traffickers who abducted Zhang Qingsheng seven years ago are still serving their sentences.  .Ye Qian, please contact Team Xu back and ask him to implement it as soon as possible."

    "Understood." (Remember the website address: www.hlnovel.com
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