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Blood and Tears Kidney ¡¤ 4

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    The shape of the cow dung is like a grass-green cream cake that has been cut with a knife.  Then I lay down on the ground and carefully observed the rectangular mark in the middle of the cow dung.

    "You're not going crazy with hunger, are you!" Ye Qian said with a smile as she saw my butt sticking out so high.

    "Don't interrupt!"

    After finishing speaking, I took a closer look at a few smaller pieces of cow dung scattered nearby: "The suspect came out of the attached village of Guanghua Village on a motorcycle."

    "What? Are you sure?"

    "Sure!" I have no doubts about my judgment.

    "How did you judge?" We both said this sentence in unison.

    "Are you looking for a fight?" Ye Qian saw me imitating her tone of voice and raised her fist in the air.

    "I knew you would ask!"

    "What? I've been running around with you for so long and you still don't ask me questions? I treated you to so many big kidneys for nothing!"

    "Stop it, can you not mention your waist?"

    "De Xing! Say it quickly!" Ye Qian slapped me on the shoulder.

    "Then I'll tell you from the beginning!" I found a relatively strong tree and leaned against it. "We have walked on several types of ground along the way. Can you tell us about it?"

    "What's so difficult about this?" Ye Qian clasped her fingers, "The cesspit at the center is a dirt road, and the four intersections are also dirt roads, and then it's still a dirt road, and then here."

    "Stop!" I made a pause gesture, "Come on, you are a layman, I won't make it difficult for you."

    "Did I say something wrong?"

    "You are right, but you understood it wrong. We know that the suspect drove a motorcycle to dump the body, but how to judge his driving route depends on the tire marks."

    "First of all, the road we took out from the cesspit has relatively moist ground, and the mud on the road can be easily rolled up, so I can analyze the suspect's driving direction based on the characteristics of the mud."

    "Characteristics of mud rolls?"

    "Yes. The soil on the road has adhesion. When the part of the car tire that is in contact with the ground moves upwards away from the ground, it will lift up the adhered soil. When the soil leaves the tire and falls back to the ground, the mud pieces are flattened by the tire.  They will be rolled together and look like beef rolls cooked in hot pot. This phenomenon is called the mud roll phenomenon, and the direction of the mud roll is the direction of the vehicle."

    "I just know how to eat!" Ye Qian curled her lips.

    "Are you still listening?"

    "Listen! Go on!"

    "From the mud rolling phenomenon, I analyzed that the suspect was driving from south to north on this road, so I ran along the road until I reached a four-way intersection."

    "Well, that's right."

    ¡°The mud on this section of the road is relatively hard and the tire tracks are not clear. If you rely only on the naked eye, it is difficult to tell which direction the suspect is walking. We must use the ¡®mud curling phenomenon¡¯ to judge.¡±

    "Why are the names in your trace science so weird?"

    After giving Ye Qian a roll of the eyes, I continued: "When the wheels run over slightly harder soil, because the soil lacks water and has insufficient adhesion, it will not be lifted up by the wheels and can only form mud on the ground.  When the wheel is traveling, the tire exerts a backward and downward force on the ground. When the force presses the mud piece, one end of the mud piece will tilt upward. This phenomenon is called mud tipping, and the direction of the mud tip can be  Indicate the direction in which the vehicle is traveling.¡±

    "You're cruel!" Ye Qian gave a thumbs up.

    I smiled slightly: "Then there is a section of gray stone road. Maybe because there are not many people walking on this road, a large amount of fine sand, gravel and dust have accumulated, which makes it very easy to form traces of dirt."

    "Another new term is out." Ye Qian teased from the side.

    ¡°The gray stone pavement is full of fine dust particles, and there are large gaps in the tire tread. During the rapid rotation of the motorcycle tires, the dust embedded in the tire tread will be picked up and thrown toward the rear of the wheel.  Soil with fine particles experiences greater air resistance and is thrown closer; soil with larger particles experiences less air resistance and is thrown further. This is like a puppy digging a hole.  I drove but left a pile of dirt in front of me. It was only when I found traces of dirt at the corner that I determined the specific route the suspect took."

    "Did you determine the last route by soaking in cow dung?" After hearing what I said, Ye Qian seemed to understand.

    "Yes, that's what I want to say."The last noun: mud-slinging characteristics.  Of course, we can¡¯t say it¡¯s mud here, it should be the characteristic of throwing away excrement!  "

    "What a shame! You really know how to name!"

    I pointed to the cow dung in the middle of the T-junction and said: "The suspect dumped the body at night, and it was dark. He may not have noticed the cow dung in the middle of the T-junction. Because its location is very special, we  There is no way to tell which direction the suspect ran over. If we can't make this judgment, we may have to do a lot of useless work."

    "That's right!" When Ye Qian heard this, her expression became much more serious.

    "Let's take a look at the few pieces of calf dung that were thrown out next to the cow dung."

    Ye Qian looked in the direction of my fingertips and I said: "Because the hardness of cow dung is greater than that of ordinary damp soil and smaller than that of slightly dry soil, it can neither form mud curls nor mud curls."  We can only judge the traces based on the characteristics of being thrown. When a vehicle crushes cow dung while driving at high speed, the cow dung thrown up by the wheels will be thrown directly out due to the inertia, and then fall into small pieces on the ground again.  The upper end of the cow dung will tilt in the direction of the vehicle due to the force, and the tilted direction is the direction of the vehicle."

    As I said that, I shined the light on the small piece of cow dung: "Look, the direction of the tilt of the top is exactly the direction of the main village of Guanghua Village. In other words, the motorcycle the suspect was driving when dumping the body came from the opposite direction.  Yes, and this place is an affiliated village of Guanghua Village, so the scene of the suspect¡¯s murder is likely to be in one of those dozen households.¡±

    "Great! This way the investigation will be much easier!" Ye Qian snapped her fingers.

    After Brother Ming learned the news, he immediately reported the situation to Brigade Xu, who sent people to secretly investigate Guanghua Village. The rest of us carried out corresponding work according to Brother Ming's instructions.  (Remember the website address: www.hlnovel.com
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