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Whispers of the Dead ¡¤ 8

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    "The second type of physical evidence is shoe prints." I continued my analysis. "Although the murderer cleaned the scene after committing the crime, it was very difficult to clean up the bloody shoe prints after they dried. With the help of luminol reagent, I found many traces on the ground.  The outline of a footprint. After measuring the 'stride', 'step length', 'step' and other characteristics, it can be concluded that the murderer is a male, about 1.75 meters tall, a young adult, and committed the crime alone."

    "After the shoe prints were extracted, I found a very strange fingerprint on the door handle, wardrobe door, meter box, water dispenser, air conditioner outlet and many other places. The marks cannot be seen with the naked eye. When using equipment to assist  When observing, you will vaguely find patterns similar to fingerprints, and I suspect that the murderer was wearing something thinner than latex gloves on his hands when he committed the crime."

    Ye Qian: "Things thinner than latex gloves, what is that?"

    "At the beginning of last year, I cooperated with the technical office of the branch to go to a scene. In that case, a similar situation occurred. I was also puzzled at the time. The case was solved and the suspect confessed that he forgot to wear gloves during the theft, so he started from  The thief found several condoms at home and put them on his hands.¡±

    When Fat Lei heard this, he became more excited: "Is there still such an operation?"

    I glanced at Ye Qian secretly and saw that there was nothing strange about her. I continued: "The diameter of the condom is larger than that of a finger. The film is very thin and soft. In addition, there is a layer of oil for protection. Under a certain pressure, it can be placed on the object."  A small amount of fingerprint lines are left, but these lines have no comparative value."

    Ye Qian: "Xiaolong, are you saying that the murderer in this case also used this method?"

    "No. Generally condoms are much thicker than fingers. Wearing them with one finger will cause overlapping folds. Wearing multiple fingers in parallel is not easy to leave fingerprints. However, the suspect in this case left multiple single-finger fingerprints at the scene, indicating that he  Each finger is wearing something similar to a condom, which is thinner than a condom and fits the fingers well."

    Ye Qian: "What is that?"

    "Finger cots."

    Ye Qian: "Finger cots? I seem to have rarely heard of them."

    ¡°Finger cots have a wide range of uses, and there are five common types.

    "The first category: finger cots for daily use. Mostly used by practitioners in the tea picking industry. This kind of finger cots is very thick and cheap, and can easily fall off when worn.

    "The second category: Finger cots for labor protection. Usually worn by nail salons and money counters. Although this kind of finger cots fits well, it will be worn frequently, so the material is thicker.

    "The third category: medical finger cots. Commonly used for gynecological and anorectal examinations. In order to increase the lubrication of contact, the outside of these finger cots is coated with oil.

    "Category 4: Anti-static finger cots, also known as conductive finger cots. It has two functions: one is to prevent fingertip sweat stains from contaminating components, and the other is to safely release the operator's human body charge. In order to facilitate flexible finger operation,  This kind of finger cot is very thin and highly wear-resistant, and is mostly suitable for practitioners in the semiconductor industry and optoelectronics industry.

    ¡°Category 5: Physiological finger cots. It has the same ingredients as condoms and is used under special circumstances.

    "There are a small number of line marks in the fingerprints left at the scene, indicating that the finger cots worn by the murderer are very thin, so thicker finger cots for daily use and labor protection finger cots can be ruled out; and because there is no oil on the fingerprints, medical finger cots  and physiological finger cots can also be ruled out. Now only anti-static finger cots are left, but these finger cots are widely sold and have no directivity. However, the murderer can both cast keys and purchase professional finger cots, which shows that he has  With high manual skills, it is suspected that he may be a practitioner in a related industry.

    ¡°There were obvious signs of rummaging in the room, but cash and jewelry were not missing. The murderer was not targeting property.

    "On the night of the crime, the outdoor temperature was around 17 degrees Celsius, which was not high. However, the suspect still turned on the cabinet air conditioner on the first floor. This shows that the murderer spent a lot of energy when committing the crime, which accelerated metabolism to generate heat. The most important way for the human body to dissipate heat is  It is the evaporation of sweat, so after exercise, you need to replenish a lot of water. There is a barreled water dispenser in the living room on the first floor. I suspect that the murderer may go there to collect water for drinking.

    "Subsequently, I found a disposable water cup in a nearby trash can. There were no fingerprints on the surface of the water cup, and no DNA was found on the mouth of the cup. In other words, the suspect did not directly touch the mouth of the cup when drinking water. He was killing  Even after he was dead, he could still notice this detail. It must be said that his psychological quality is definitely different from ordinary people. However, I found out that the murderer made a fist while drinking water. I still found it on the wall of the cup.  Incomplete palm prints." (Remember this website address: www.hlnovel.com
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