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A companion in the underworld ¡¤ 6

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    ¡°I only extracted one biological sample at the scene, and that was the blood stains of the deceased.¡±

    This sentence doubled my pressure.

    "However, the distribution of blood stains in this room can illustrate a problem."

    "what is the problem?"

    "Through the distribution of blood stains, I can basically restore the suspect's entire crime process."

    "The whole story of the crime?" Lao Xian usually had the same expression no matter what he said or did. He could keep his composure, but I was extremely anxious.

    "First of all, I found a blood stain on the main switch of the meter box in Zhao Heizi's home. The blood was very large."

    "That means the suspect touched the main power switch in the deceased's home after killing him?" After hearing this, I had an epiphany.

    "right."

    "So the suspect turned off the main power supply in the deceased's home in advance, and after killing the deceased, he turned on the main power supply again, so there were blood stains on the main switch?"

    "That's right."

    "The suspect must first arrive at the deceased's home to prepare himself. From this point, we can analyze that the suspect must have ambushed the deceased's home in advance!"

    "should be."

    "I extracted Zhao Heizi's fresh fingerprints from the light switch at the door, so the situation at that time should be that the deceased entered the house and raised his hand to press the light switch at the door, but the main power supply in the house was turned off, so the deceased wore shoes and touched the dark  He walked into the house to check, and at this time, the suspect who was ambushing in the house took advantage of his unpreparedness and slashed his neck with a knife." Following Lao Xian's prompts, I deduced the entire incident.

    "But how could the suspect act so quickly in the dark?" Ye Qian was a little confused.

    "Although it is in a dark room, the suspect's eyes can see clearly."

    "What? No way?"

    "Haven't you ever noticed that when we turn off the lights at night, it's dark at first and we can't see anything for a while, but after a while, we can see things in the house again?"

    "This seems yes." Ye Qian nodded.

    "This is a phenomenon in which the eyes adapt to a dark environment, called dark adaptation."

    "Dark adaptation?"

    "Let me explain this." Ming Ge said, "The human retina has cone cells and rod cells: cone cells are mainly distributed in the macular area, and rod cells are distributed in the retina outside the macular area; cone cells can only sense strong  Light stimulation, while rod cells are sensitive to low light. That is to say, seeing things at night or in a dark environment mainly relies on rod cells. Why do rod cells have dark vision function? This is because the inner  Contains a substance that senses weak light - rhodopsin. Rhodopsin is composed of vitamin A and opsin. Under strong light, rhodopsin is decomposed. Therefore, when you suddenly enter a dark place from strong light, the cone cells lose their function.  , rod cells need to resynthesize the decomposed rhodopsin, and this synthesis process is the process of dark adaptation, which usually takes several minutes."

    "The suspect entered the room in advance and turned off the main switch. He had completed the synthesis of rhodopsin in the dark environment, so he could see clearly what was going on in the room."

    "There are strong lights in the corridor on the floor where Zhao Heizi lives. As I said just now, under the strong light, the rhodopsin in his eyes decomposes. When he enters the dark room, because the rhodopsin needs to be synthesized, he  In a state of temporary blindness, the suspect should be the one who took advantage of this moment to kill."

    "It seems that this suspect is really extraordinary!" Ye Qian sighed.

    "Guoxian, go on."

    Lao Xian opened another report: "I extracted blood stains of the deceased from the balcony, windows, cabinets, drawers and other places indoors. However, according to the on-site blood test results, the blood in these places is thinner, so I suspect  The suspect may have washed the blood stains on his hands after turning on the power switch. I also found a red towel on the bathroom floor, and I found three substances on the towel."

    "Three kinds?"

    "Yes." Lao Xian flicked the ash into the ashtray, "The first type is the blood of the deceased, the second type is ordinary sand and soil particles, and the last type has a more complex composition."

    "complex?"

    ¡°I extracted a large amount of shellac, pure benzene, rubber, ethanol and other ingredients from it.¡±

    "What are these things for?"

    "If we dissolve the shellacIn ethanol, after filtration, a brown transparent solution can be obtained, then dissolve the rubber in benzene, and mix the two solutions in equal volumes, so that you can obtain an item commonly used in our lives.  "

    "Commonly used items?"

    "Yes, leather varnish is used to color or increase the brightness of leather clothing. If you need black, you can use aniline black, for yellow, use oil to dissolve yellow, for red, use oil to dissolve red, etc."

    "Sand, dirt, leather varnish, blood stainsBrother Xian, you mean to say that after the suspect killed the person, he wiped it with a towel in the bathroom and left these three substances on the towel?"

    Lao Xian nodded: "The towel I extracted was originally very clean. According to the analysis, it should be a face towel. The suspect must have taken it and used it. The presence of these three substances is easy to understand. The suspect used the towel to wipe his shoes and  Clothes. There is obvious aniline black content on the towel, so I analyzed that the suspect should have been wearing a black leather jacket when he committed the crime."

    Fat Lei quickly recorded this detail in his notebook. This key point has a very important direction for the subsequent video investigation work.

    "That's all I have here for the time being. Xiaolong, tell me." (Remember the website address: www.hlnovel.com
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