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Fish Pond Phantom ¡¤ 6

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    With the suspected shoe prints and a clear route in and out, the investigation of the surrounding scene was progressing smoothly. As soon as I stepped out of the cornfield with my front feet, I made a discovery on the dirt road with my back feet.

    ¡°Intermittent bloody tire marks!¡± I shouted excitedly.

    Brother Ming was calm and asked: "Can you deduce what kind of transportation it is?"

    ¡°It¡¯s not enough to just look at it, we need to measure some data.¡± As I said that, I lay on the ground, put my eyes on the mark, and carefully observed the details of the tire mark.

    In previous on-site investigations, tire marks are the most common trace evidence. Trace science has also conducted very detailed research on this. We can get a lot of information through on-site tire marks.

    The ones we are familiar with include the following:

    First, the number of tire marks on site.  The number of traces often reflects the number of tires on the vehicle, and the number of tires determines the type of vehicle, such as unicycles, two-wheelers, three-wheelers, four-wheelers, etc.

    Second, the width of the tire marks on site.  The width of tires produced independently in our country has fixed national standards for reference, so the width of tires also has important research significance.  For example, the width of tire tracks on ordinary bicycles is between 2.5 and 3 centimeters (assumed values, not real data), ordinary two-wheeled motorcycles are between 10 and 12 centimeters, ordinary small cars are between 15 and 20 centimeters, and so on.

    Third, the type of tire tread on site.  Although there are many types of tire patterns, they can be roughly divided into four types: square patterns, longitudinal patterns, horizontal patterns and mixed vertical and horizontal patterns.  Square patterns are generally reserved for off-road vehicles and construction vehicles; longitudinal patterns are generally reserved for cars and light buses; horizontal patterns are generally reserved for buses and trucks; vertical and horizontal mixed patterns are generally reserved for jeeps and civil construction vehicles.

    The scene is complex and changeable. Even though so many values ??have been summarized in "Traceology", special cases still need special treatment.

    The current case is a special case. What I observed at the scene were not continuous tire tracks in the traditional sense, but a large number of gaps. It may be that the suspect was in the process of transporting the body, and the blood stains only dripped intermittently.  on the tires, leaving this mark on the road.

    If it is on an asphalt road or cement road, the above research conclusion can be directly applied to intermittent tire marks, but it is completely unfeasible in this case.

    First of all, the ground in this case is a bumpy dirt road. There is plenty of sunshine during the day, the water evaporates a lot, and the road surface is hard. It is difficult to leave three-dimensional mud tire marks. If the soil is slightly softer, I can still tell how many wheels it is.  But judging from the current situation, it is basically impossible to start.

    Secondly, the closed environment of this dirt road is different from that of the fish pond. A large number of pedestrians pass by during the day. Even if there are a few marks left on the night of the crime, it will probably be difficult to find them after several days of destruction.

    What gives me the most headache is not only that, because when the suspect dumped the body, only a very small amount of blood dripped on the edge of the tire, so only some incomplete edge patterns were left on the ground. What I have to do now is  I want to get the answer I want from this discontinuous pattern.

    In this situation, relying on conventional methods is basically a dead end. This reminds me of a sentence my father often said: "A lot of knowledge in trace science cannot just stay on the surface. You have to dig deeper."  It was my father¡¯s tireless teachings that made me change my previous careless attitude towards physical evidence.

    In my opinion, tire marks are simply the "sole" of a vehicle, which is similar to analyzing the characteristics of "shoe prints". We all know that when shoes are worn for a long time, the soles will have wear characteristics, and the same is true for tire marks.  Since transportation vehicles vary from person to person during use, the tire wear characteristics of different vehicles also vary widely.

    Although the tire tracks left at the scene of this case have extremely limited patterns, as long as I find an obvious wear feature, I can make a rough inference about the type of vehicle.  Some people may be surprised that a vehicle type can be analyzed with just one wear characteristic. Isn¡¯t it a bit mysterious?  But to be honest, I had the same doubts at first, but after learning the principle, I fully understood the meaning of my father¡¯s words.

    No matter how many discontinuities there are in the tire marks in this case, as long as I lock a certain wear feature, find two adjacent wear features in the discontinuous marks, and then measure the distance between the two, I can get a value, and this value  It's the circumference of the tire.

    We all know that the circumference of a circle = ¦Ğd = 2¦Ğr. We divide this value by ¦Ğ to easily get the diameter of the tire.

    Since 1 inch = 25.4 millimeters, we can deduce the tire size by dividing the tire diameter by this number.?Throw it hard.

    Although it is not strange to find empty wine bottles in the fields, it happened that there was a trace of smoke on the mouth of the bottle, which had to attract our attention.

    Fat Lei strode forward and took a picture of the original position of the wine bottle with his camera, while I carefully took the bottle back.

    ? After looking around, there is no label on the glass bottle, and it is currently unclear which alcohol brand it belongs to.

    Just when I turned on the strong light to observe whether there were fingerprints on the wine bottle, several faint reddish spots appeared under the strong light.

    Lao Xian wiped it with a cotton swab, then took out the luminol spray. He then placed the cotton swab in a dark box and heated it, and a light blue light spot quickly emitted from the cotton swab.

    "Human blood." Lao Xian came to the conclusion.

    "Then it's basically certain that this is the wine bottle used by the suspect." I felt happy, pointing to the dense fingerprints on the wine bottle and said, "Then the liquor in the wine bottle is the accelerant, and the fingerprints on the wine bottle are  Left by the suspect.¡±

    Hearing what I said, Ye Qian breathed a sigh of relief: "Finally found a physical evidence that can identify the suspect!" (Remember the website address: www.hlnovel.com
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