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Whispers of the Dead · 4

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    According to the building structure of the center site, the on-site investigation starts from the outside to the inside.  The iron-clad house in the courtyard was identified as the No. 1 exploration target.  The house has a rectangular layout, long from east to west and wide from north to south; the door is made of simple iron foam board, facing west, with a ball lock, opening, and the door is silent when pushed; there is a set of wardrobes standing on the north wall of the entrance, and placed against the west wall  A single bed with a north-south orientation, with the bed head facing north, and the rest of the room is relatively empty.  Concrete floor, no obvious shoe prints.

    The single bed was made of simple wooden boards. There were a lot of blood splatters on the white wall at the head of the bed. There was an oval pool of blood on the ground under the bed. There was a plate of extinguished mosquito coils placed at the head of the bed.  Judging from the distribution of blood stains, this is one of the murder scenes.

    Lao Xian took out a piece of chalk and a magnifying glass, and after marking a few exclamation mark-shaped blood spots, he said with certainty: "This is a splatter of blood from the carotid artery. At the time of the murder, the deceased was lying flat, and the height of the splatter was at 30  Within centimeters, the elderly deceased was killed here.”

    Observing the shape of blood stains to determine the location of bleeding is an essential skill for physical and chemical examiners.  Taking arterial blood vessels as an example, arterial blood spatter is a bloodstain pattern formed by blood spurting caused by blood vessel pressure after an artery ruptures.  The formation of the graph is related to two factors: one is the diameter of the blood vessel, and the other is blood pressure.  The arteries in the human body can be roughly divided into four types: the first type, the carotid artery, the blood vessel diameter is about 6 to 7 mm; the second type, the brachial artery, the blood vessel diameter is about 3 to 4.3 mm; the third type, the ulnar artery, the blood vessel diameter  About 1.5 to 3.4 mm; the fourth type, the radial artery, has a diameter of about 1.7 to 2.9 mm.  The normal blood pressure values ??for adults are systolic blood pressure of 90 to 139 mmHg and diastolic blood pressure of 60 to 89 mmHg.  With the data, we only need to select hoses of the same diameter and adjust the pressure range to simulate the blood stain patterns formed by blood under different pressures.  The diameters of arteries are different, and the blood stain patterns formed under the same blood pressure are also different. When multiple blood stain patterns are found at the scene, "experienced drivers" can make inferences only with the naked eye.

    As age increases, the systolic function of the heart gradually decreases, and the height of blood stains will be significantly reduced.  The blood spatter of young adults can reach up to 2 meters, but the blood stains on the bedside in this case only cover an area of ??30 centimeters, which is consistent with the characteristics of blood spatters of an elderly person. Therefore, Lao Xian only marked a few blood stain patterns to determine the color plate.  The house is where Shao Fen was killed.

    After analyzing the blood stains, Lao Xian picked up the blood-soaked mosquito coils on the bedside.

    I asked curiously: "Brother Xian, you are so careful in your observations, can you also analyze mosquito-repellent incense to find valuable clues?"

    Lao Xian took the mosquito coil off the holder, put it on the tip of his nose and sniffed: "There are two types of disc-shaped mosquito coils on the market, herbal mosquito coils and chemical insecticide mosquito coils. When the herbal mosquito coils are lit, they will emit an herbal scent.  It has a refreshing fragrance, and its smoke does little harm to the human body. Chemical insecticidal mosquito coils contain 666 powder, 223 pesticides, DDT and other chemical substances, which smell very pungent. Inhaling the smoke for a long time will cause dizziness and nausea, and this  When mosquito coils are incompletely burned, they will also produce carcinogens such as polycyclic aromatic hydrocarbons, carbonyl compounds, and benzene.

    "Judging from the taste, the dish on site is a chemical insecticidal mosquito coil, which is very cheap. The price of a pack of 10 is about 3 yuan. In addition to harmful chemicals, it also includes organophosphorus, carbamate, pyrethroid,  Carbon powder, sawdust, etc. The total length of each coil of incense is 102 cm. In a windless room, the burning speed is 8 cm per hour. There are no burn marks on the base of the mosquito coil, indicating that this coil of mosquito coil was used for the first time on the night of the crime.  "

    Hearing this, Fat Lei looked around, and he found a freshly opened box of mosquito repellent incense at the end of the bed: "Brother Xian, there are 10 plates in the package, and there is just one plate missing."

    Lao Xian opened the measuring tape, measured it and said: "The unburned length of the mosquito coil is 54 cm, the burned length is 48 cm, and the burning time is 6 hours. Many people are used to lighting mosquito coils before going to bed. From this, it can be inferred that the murderer committed the crime.  Within 6 hours after Shao Fen rested."

    ??Pang Lei gave a thumbs up: "I am a wise brother in society. People are cruel and don't talk much. You are awesome!"

    The investigation continued, and I immediately made a discovery at the door: "Brother Xian, there is a trail of blood here."

    Lao Xian changed to a large magnifying glass. After careful observation, he said: "After killing Shao Fen, the suspect should have stood at the door to observe the situation inside the building, which is why dripping blood was formed at this location. There was dripping blood at the murder scene.  There are two situations: one is that the suspect is injured, and the other is that there is blood residue on the killing tool.

    “Shao Fen was asleep when the suspect committed the crime. In this case, the murderer is unlikely to be injured. If the first scenario is eliminated, then only the second scenario remains.

    "It is known that the average blood content of each drop of blood is 0.05 ml. The final shape of the blood drop on the ground depends on the speed of the blood drop after leaving the crime tool. The longer the tool, the greater the impact on the blood surface.The greater the force, the faster the acceleration the blood droplets will get when leaving the knife. In this way, a large area of ??starburst-shaped blood spots will appear after the blood droplets quickly collide with the ground.  We only need to measure the diameter of the blood spot and then refer to the 'Blood Drop Experiment' database to deduce the length range of the knife handle.  After finishing speaking, Lao Xian opened the measuring tape and began to measure, "The suspect used a long knife with a blade length of more than 40 centimeters."  "

    "A machete, a dog-leg knife, or a watermelon knife?" I began to guess wildly.

    Lao Xian: "It's all possible, it's hard to judge now." (Remember this website address: www.hlnovel.com
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