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Secret Whispers of the Dead · 7

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    Brother Ming picked up the water cup and took a sip of water, and continued to reconstruct the scene: "Except for fatal injuries, the bodies of Shao Fen, Fan Fang, and Ge Mingyuan had no other obvious external injuries. On Ge Liang's body, I found a blunt head.  Instrument injuries, binding injuries to hands and feet, bruises on the upper body and slap marks on the face. The blunt force injuries to the head were in the shape of a depression. The suspect used a cylindrical blunt object. The cracks in the skull were not obvious. The blunt object was made of light material and was presumed to be wood.  The stick. From the analysis of the direction of force, the wound was caused by a back blow. The suspect stood behind Ge Liang and hit the stick with all his strength.

    "After Ge Liang was knocked unconscious, the suspect tied him to a wooden chair, and then moved the other three corpses to the living room. Then, the murderer slapped Ge Liang fiercely to wake him up. Ge Liang saw his parents and grandmother  After being killed, he began to struggle and resist out of fear, leaving binding injuries on his hands and feet."

    Brother Ming paused for a while and said: "At present, most of the scars on Ge Liang's body can be reasonably inferred, except for the bruises, which are somewhat ambiguous. Bruises, known as contusions in medicine, are caused by some smaller bruises.  It is formed when a blood vessel ruptures, causing blood to escape into the tissue. Blood will not flow in the capillaries after death, so bruises must be injuries during life. Bruises will show different physical characteristics according to the person's constitution. For example, some people are slightly  A bump can form bruises that last for a long time, but for some people it is just the opposite; the bruises on Ge Liang's body were either caused by the suspect venting his anger during the murder, or they had nothing to do with it. Before the investigation of the case was completed, this  We can only put aside the doubts for the time being.”

    Brother Ming lit the cigarette and took a deep breath: "In this case, Shao Fen, Fan Fang, and Ge Mingyuan were all directly killed. Only Ge Liang was knocked unconscious and then woken up, and then tortured to death. It is not difficult to analyze from the method of committing the crime.  The murderer must have some kind of hatred against Ge Liang. If the hatred was one-sided, he would not choose the extreme method of exterminating the family. Therefore, I speculate that the hatred should come from the victim's family, but the source is Ge Liang."

    Fat Lei pinched his chin: "From this point of view, this case can be 100% characterized as being committed by an acquaintance."

    Brother Ming said "hmm" and then asked: "Is there any surveillance near the center site?"

    ?Pang Lei spread his hands: "None of them are useful."

    Brother Ming looked at me: "Xiaolong, what's going on over there?"

    “In terms of trace inspection, we have dealt with multiple physical evidences. Let me talk about the first type first: the lock cylinder.

    "There are a total of 7 doors and 7 lock cylinders on site, including the courtyard door, the iron door of the color board room, the first-floor security door, and 4 bedroom wooden doors. Among the 7 doors, except for the courtyard door, it is a 'B-level cross flower' lock  Except for the core, the rest are all 'A-level straight-shaped' lock cores. Observed under a microscope, there are only two lock cores that have been pried: the yard gate and the first-layer security door.

    "There are many ways to pick locks studied in trace science. Common ones include violent picking, tinfoil paper locking, wire hook locks and key unlocking. Violent lock picking has no technical content, and the traces of damage are large and can be eliminated. Tinfoil paper lock picking is to remove tin  The paper strip mold is inserted into the lock hole, debugged back and forth, and then professional tools are used to unlock the lock. Using this method will form a large area of ??scratch marks inside the lock core. This feature does not exist in the on-site lock core, so it is excluded. Wire hook  The lock will form linear traces inside the lock cylinder. This situation does not exist and can be ruled out. The last method is to open the lock with a key. For the two simple lock cylinder keys of 'cross flower' and 'line-shaped', use ordinary electronic keys.  The key machine can be used to prepare the key. The working principle of the key machine is: one end holds the original key and the other end holds the key blank. After the machine is powered on, the key blank is cut according to the original key pattern to complete the preparation. On the key teeth of the new key  There will be a cut metal protrusion. When it is inserted into the lock cylinder and twisted, it will leave unique marks on the inner cavity of the lock cylinder. The marks are very consistent with the pry marks on the scene. In other words, the murderer used a prepared  The key opened the door and entered the room. In addition, Brother Xian also found a large amount of metal residue inside the lock cylinder."

    Lao Xian took over: "The main component of the residue is cast iron with a carbon content of more than 2%. The sample cast iron contains a large number of impurities, such as the products of various iron products smelting and casting; the key blanks on the market are made of white copper or brass.  It is impossible to use such low-quality materials. I suspect that the murderer did not use a key machine to match the key. He chose another method-plastic clay casting. This method is to wrap the key in clay to make a mold, and then  Pour iron slurry into the mold, and after the iron slurry cools, the preparation can be completed. The melting point of impurity iron is 1300 degrees Celsius. At this temperature, the clay mold will shrink by a certain proportion due to evaporation of water, so the prepared key will be smaller than the original key.  The key is slightly smaller and needs to be twisted multiple times when opening the lock, which can easily leave cast iron residue in the lock core. But no matter which method the murderer uses, he can at least prove one thing: he has had access to the original key." (Remember this site.  Website: www.hlnovel.com
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