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Demonic Disciple ¡¤ 3

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    You can search for "Nine Drops of Water¡¤Corpse Investigation Department Series (7 volumes in total)" on Baidu to find the latest chapters!

    Using maggots to deduce the time of death is already a very mature skill in forensic medicine.  According to research, the ontogeny of maggots goes through four stages: egg, larvae, pupa, and adult.  Once a person dies, as long as the temperature is suitable, flies will swarm in and lay eggs in dark and moist places such as the corners of the eyes, ears, mouth, nose, armpits, and perineum of the corpse. The fly eggs develop into larvae in one day, and then develop into larvae in another day.  The first-instar worms gnaw frantically on the corpse, then turn into the second-instar worms one day later. Then they eat frantically for one day and turn into the third-instar worms. After 4 to 6 days, the third-instar worms will pupate. After 5 days of pupation, the adult worms will break out of their shells.  At this point, the fly has completed the entire metamorphosis process.

    According to the test, when the indoor temperature is 22 degrees Celsius, it takes 19 days for eggs to develop into adults. If the temperature is above 25 degrees Celsius, it takes 12 days.

    The maggots in this case have not pupated, and the longest death time of the deceased did not exceed 9 days. The recent average temperature in Yunxi City is above 25 degrees Celsius, which is the golden temperature for the growth of maggots.

    Following Brother Ming¡¯s instructions, Lao Xian selected 10 maggots from multiple parts of the body and measured the lengths one by one, while Ye Qian carefully recorded them.

    "Brother Ming, the average length is 2 centimeters." Lao Xian then reported a number.

    Brother Ming took out the comparison table and started calculating.

    Forensic entomology is a very mature subject, and there is in-depth research on it both at home and abroad. In order to obtain accurate experimental results, some foreign scientists do not hesitate to risk moral trials and build "corpse farms"  .

    Through various studies, it has been confirmed that the time it takes for corpse flies to reach the bait is 5 to 10 minutes. Because the time is too short, it is not considered in the actual calculation.

    This is ignored so that we can formulate the formula:

    Death time = fly egg laying time + fly egg hatching time + maggot growth time

    According to the experimental data (the following data is for the convenience of understanding and is not based on real experimental data), the fly egg laying time and fly egg hatching time are basically close to fixed values ??depending on the month. Calculated according to the average temperature of Yunxi City, the fly egg laying time in September  The egg time is 16 hours, and the fly egg hatch time is 13 hours. Knowing these two times, as long as the maggot growth time is known, it is easy to calculate the death time.

    The length of maggots when they break eggs is basically the same, about 0.175 centimeters long. The average length of maggots in this case is 2 centimeters, which means that the maggots have grown 1.825 centimeters since they broke eggs.

    Similarly, under the same temperature and sufficient food, the growth rate of maggots follows certain rules. When it is higher than 25 degrees Celsius, the coefficient of maggot growth time and maggot length change is 85 hours/cm (assumed value, not real  data), that is:

    Coefficient = maggot growth time/maggot change length

    Converting to our case, it is 85=maggot growth time/1.825 cm. Through calculation, it can be concluded that the maggot growth time is 85x1.825=155.125 hours.

    Therefore, the death time of the deceased = 16+13+155.125, the total time is 184.125 hours, the survey time is 15 hours, subtracting the existing time, the value obtained is 169.125 hours, about 7.047 days, which is about 7  Day zero is 1.13 hours, converted into precise time, it is 1:08 am on September 7th.

    Brother Ming took a look at the calculation result: "It's past 1 o'clock in the morning, the deceased should be in a deep sleep, strangers will not wake the deceased up, it should be an acquaintance."

    "It's not that familiar yet." Ye Qian added at the right time.

    Thinking about it from their perspective, if you are asleep late at night and you are not very familiar with the other person, you will not open the door easily, especially in the deep mountains, so Ye Qian's speculation is not unreasonable.

    "At 1 o'clock in the morning, melatonin secretion is strong. The deceased was probably still in a semi-conscious state when he got up and opened the door." Lao Xian put down the door latch, which was as thick as an arm. "There was blood on it. The blunt force injury on the deceased's head was probably caused by the door latch.  "

    "Xiaolong, are there any signs of being disturbed in the house?" Brother Ming asked.

    ¡°The furniture hasn¡¯t been dealt with yet, so it¡¯s not clear yet.¡±

    The purpose of Brother Ming¡¯s questioning is actually to determine the motive for the murder.  The deceased was elderly and the murderer was a woman of similar age. It was unlikely that the murder was caused by love.  Is it a murder for money or a vendetta?  Whether there are any signs of being disturbed in the room can be used as evidence.

    After the autopsy examination came to an end, I continued to further process the indoor furniture and furnishings. After brushing the fingerprints on the surface of the wardrobe, I took out an iron box with the lock nose unscrewed from the cabinet.

    This is an iron container the size of an urn, with a green paint lock and a small three-ring lock, which are all anti-theft measures.

    With this combination, you can twist it with your bare hands with a little effort.?, locking or not locking has no meaning at all.

    "What are you pretending to be?" Brother Ming looked at me with some confusion.

    I opened the lid knowingly. The inner layer was a yellow brocade box the size of a ring box. Judging from the recessed oval bottom inside the box, it may be used to hold some kind of spherical object with a diameter of about 3 cm.

    "Could it be for pearls?" Ye Qian looked at it curiously.

    "No matter what it was, there was indeed property damage in the house. Could the murderer's subjective motive be to steal property?"

    "It's too early to judge now. There are two things that your criminal police team needs to do next." Brother Ming looked at Ye Qian and motioned for her to record it.

    ¡°First, investigate the social relationships of the deceased.

    "Second, find possible video surveillance around the scene and retrieve it based on the time of the suspect's crime. Jiao Lei will be responsible for video analysis."

    ¡°Okay, I¡¯ve written it down, Director Leng.¡±

    "Jiao Lei, you and I go to the funeral home to dissect the body. Xiaolong and Guoxian will hurry up and deal with the physical evidence on hand." Brother Ming raised his hand and glanced at his watch, "We will have a meeting on time at 12 o'clock in the evening. Is there any problem?"

    "No!" (Remember the website address: www.hlnovel.com
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