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Roadkill ¡¤ 7

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    I thought that the deceased¡¯s wife¡¯s confession would bring a slight improvement to the case, but I didn¡¯t know that it was getting more and more complicated.  The deceased's habit of showing off everywhere is most likely to offend people. From the current point of view, there are at least two possibilities for the characterization of this case: vendetta or taxi robbery and murder.

    Taxi robbery and murder are impromptu cases. The victim and the suspect are not familiar with each other, and there are basically no contradictions in it. This kind of case is also the most difficult to detect.  Vendetta is different. When there is sufficient hatred between the suspect and the deceased, a homicide will occur.  For vendetta cases, we only need to find out the relationship network of the deceased, and the case can be solved easily.  We did not have information about the identity of the deceased before, but now that the source of the body has been found out, we can start investigating from these two directions.  Brother Ming reported the situation to the criminal police team as soon as possible, and they were responsible for the entire clue investigation and arranging work.

    The day after the incident, good news came from Pang Lei. After combing through all the traffic police surveillance in Yunxi City, he found the taxi's driving trajectory.  According to the surveillance video, the last time the deceased's taxi drove with its license plate on was on a section of the road to the High-tech Zone. After that, the license plate was removed and it drove directly to the site of the cremation.  Obviously, the suspect's murder scene is likely to be somewhere on this stretch of road.

    After determining the scope, we went straight to the destination - Fountain Road.

    Fangquan Road is a two-way four-lane asphalt road. It is located on the east side of the development zone and runs north-south. It is connected to the Huancheng Expressway to the north and to the High-tech Zone in the south. These two administrative areas are mainly factories and car 4S stores, and the permanent population is very sparse.  , so there are few vehicles traveling on this road.

    The sparse population is actually only one of the reasons. Another important reason is caused by the dialect of our Yunxi City.  In our dialect, "h" and "f" are not clearly distinguishable. When out-of-town contractors named this road, they did not consider this aspect at all. The seemingly elegant "Fangquan Road" became "Fangquan Road" in the minds of us Yunxi citizens.  It became the "Huangquan Road".  This unlucky homophony is also an important reason why many locals are reluctant to drive on this road.  There are many intercity highways like this in the city. Drivers will basically not consider this place when they have more choices.

    As expected, only one of our survey vehicles was driving on the five-kilometer-long Fangquan Road, which brought great convenience to our on-site survey work. At least in this case, the integrity of the original site could be guaranteed.

    Under the control of Pang Lei, the survey vehicle drove forward slowly, while everyone else stuck their heads out to observe abnormalities on the roadside.

    Not long after the car started driving, Fat Lei suddenly stepped on the brake and pointed to the sidewalk on the east side of the road: "Look there, there is a pool of blood."

    "Let's go down and have a look." Brother Ming was the first to open the car door and walked out.

    Blood, as the most common physical evidence in homicide cases, has been deeply studied in many fields of criminal technology, especially in the two disciplines of forensic medicine and trace examination.  We roughly divide the blood stains at the crime scene into the following categories for study: blood pools, dripping blood stains, columnar blood stains, blood spatters (arterial blood spatters, blow blood spatters, dripping blood spatters, mouth and nose blood spatters),  Shake blood, wipe blood, transfer blood, soak blood, dilute blood, and dry and clotted blood.  From such a detailed division, it is not difficult to see the importance of blood for on-site analysis.

    So what information can we get from the blood at the scene?  In addition to DNA, the most direct method is to analyze the approximate time of the crime and the circumstances of the injuries.

    According to research, the average blood content of a drop of blood is about 0.08 ml13, and the blood content of blood drops dropped from different blood sources varies between 0.01 and 0.16 ml.  After experiments, it was found that the final speed of a drop of blood of about 0.08 ml in free fall is about 861.3 centimeters per second. The smaller the blood content, the slower the speed of the blood drop, and the larger the drop, the faster.  If we find a blood drop close to 0.08 ml at the crime scene, we can use a calculation formula to roughly estimate the height from which the blood drop fell, which will help determine the location of the wound.  If the blood drops are dripping from the crime tools, we can also judge based on the conclusion what kind of murder weapon the suspect used.

    Of course, this is just a rough judgment. In fact, the most direct way is to infer the time of the crime.  After blood leaves the human body, it generally takes 3 to 15 minutes to coagulate. The color of the coagulated blood will change from bright red to dark red, dark brown, and black in sequence.  If there is a pool of blood at the scene, it will be easier to analyze.

    Blood flows out from the human body in large amounts, forming a sheet-like blood pool. After evaporation and concentration, the blood pool usually begins to dry within 30 minutes to 3 hours; after 4 hours, the dryness develops from the edge to the center; between 8 and 12 hours, most of the blood pool is dry.  , only the central part will be concentrated.Thick blood stains; after 12 to 15 hours, except for the smaller central part that has not solidified and dried, the rest of the blood stain has completely dried and hardened; after 36 hours, the blood pool will form cracks, and the edges will separate from the blood carrier and become raised.  The physical properties of a pool of blood play a great assistive role in determining the time of death of the victim.  Of course, this is just something very simple. Some criminal investigation experts can even reconstruct the entire crime scene through blood stains.  (Remember the website address: www.hlnovel.com
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