"But do people drowned in water before they die or thrown into water after they die?"

"The preliminary judgment was that he drowned in the water during his lifetime." Yang Qiuchi picked up the hand of the corpse and signaled that Song Yuner could see the nails of the deceased's fingers. Song Yuner stared at him for a long time, but found nothing unusual, and looked at Yang Qiuchi in confusion.

Yang Qiuchi said, "Please pay attention to what's in the cracks in his nails?"

Song Yun'er stared at the cracks in her fingernails, frowned and said, "Hey~! This man's nails are not cut even if they are long. Look at the black mud in the nails~!"

"Look at it carefully, that's not black mud."

"No? What is that?"

"River mud, mud and sand at the bottom of the river!"

Song Yuner's eyes lit up: "I understand. If this person was alive and entered the water, he would sink to the bottom of the water because he tied the stones. The mud and sand were deeply trapped in his nails. It would not be deposited into the nails with the water flow. It could only be left when he struggled and digged the mud and sand at the bottom of the river."

"Very good!" Yang Qiuchi praised: "Yun'er has learned to observe carefully. This kind of careful observation is required to solve cases. Only in this way can the clues of crime be found."

Song Yuner smiled proudly, revealing her neat little beetle. Yang Qiuchi found that Song Yuner's beetlele was as neat and beautiful as her good cousin Song Qing.

Yang Qiuchi continued: "Based on the crab-like foam at the nose and mouth of the deceased and the mud and sand in the fingernails, the preliminary judgment was that water was entered during his lifetime. Of course, a positive judgment must be made and further testing must be made."

"How to further test?" Song Yuner said.

"This... is too complicated, I will tell you later." Yang Qiuchi played tricks and continued to inspect the corpse.

It’s not that he kept it a secret, but that he really couldn’t tell Song Yuner, because further testing is to dissect the imperial court’s body. After dissecting, if a foreign body such as inhaled river water or even aquatic plants is found in the upper respiratory tract of the deceased, or if the mucosal epithelium swelling caused by severe coughing and choking in the respiratory tract, as well as water emphysema, or if river water or even aquatic plants are found in the stomach, the yellow hair and drooping hair can be further judged as drowning.

Because only the respiratory behavior of a living person can cause this result. If a dead person does not breathe, the water can only reach the mouth and at most the upper part of the upper respiratory tract. It is impossible to reach the lungs or gastrointestinal tract.

In addition, there is another very important task for autopsy, which is to detect diatoms in the body of the deceased. If plankton diatoms are found in multiple organs of the deceased's internal organs, they will basically be drowned before their death.

Of course, autopsy could not be performed in ancient times. Yang Qiuchi was not prepared to take this risk, so Song Yuner could not say it.

However, although the imperial court cannot dissect autopsy, necessary tests must be done. One of the most important tests in drowning autopsy must be done, that is, detection of diatoms. This is an important reference for finding the location where the deceased fell into the water.

Diatoms are a kind of plankton that cannot be seen by humans in the water. Most of them are single cells. They can be sucked into the lungs by the deceased as the water flows and circulate throughout the internal organs of the body through the internal circulation. If a person is thrown into the water after death, since the dead will not breathe, the diatoms in the water cannot enter the human body. Therefore, the discovery of diatoms from the internal organs of the human body can be used as important evidence to prove that they drowned in water before their death.

Of course, this is not absolute. There are cases where diatoms are detected from the body when drowning, because diatoms not only remain in water, but also in the wet land, air, and food.

Another important role of diatom test is to find the place where the deceased fell into the water.

There are about 15,000 diatom species. In a river, the unit number of diatom species in different waters cannot be exactly the same. What Yang Qiuchi needs to do is to find the diatoms in the body of the deceased and determine their type and unit number, and then extract the water samples from different water sections of the water and test them. Find the same thing between the two, and there is the water area.

The content of diatoms in various organs and tissues in the human body is different, mainly concentrated in the lungs, liver, other heart blood, kidneys, heart and spleen. However, due to the different contents of different internal organs, the detection rates are very different. For example, it can be detected in the lungs, but in the spleen, there is only a fourteen percent chance of being detected.

Therefore, the most ideal thing is to dissect and extract the lungs and liver for testing, but this was impossible in ancient times, but this could not be a problem for Yang Qiuchi, because diatoms can also be found in the teeth of drowning people.

Therefore, Yang Qiuchi extracted a tooth of the deceased for examination.

Seeing that Yang Qiuchi refused to say anything, Song Yuner curled her lips and then watched Yang Qiuchi check the body.

Yang Qiuchi examined the cornea of ​​the deceased and found that he had tried again the turbidity, the epidermis of the hands and feet skin were detached, and combined with the corpse spots and body corruption, the death time was about two days.

When checking the zombie zombie, it was found that the zombie zombie had begun to relieve. It was just now that the dead man died about two days, while the zombie zombie on land usually started to relieve after three days. However, it is different for drowning people. Due to violent struggle, convulsions, and vigorous muscle movements, the zombie zombie occurs early, and correspondingly, the relief is relatively early.

When checking the surface of the body, I found some scratches, which were very shallow and not enough to cause death. It should be caused by the collision between the body and the rocks when floating in the water. In addition, there were some pale small wounds on the body, which were left by pecking and biting by small fish.

There was a thin iron chain on the neck of the deceased, with a large stone tied to one end of the chain. Yang Qiuchi carefully examined the deceased's neck.

Song Yuner came over and looked at it and asked, "Brother, have you found anything?"

Yang Qiuchi touched his chin and thought for a while, saying, "Although there are traces of subcutaneous bleeding left by the friction of the iron chain on the neck of the deceased, there are no traces of pinching. Moreover, the chain is wrapped around the neck and does not strangle the neck. Therefore, the friction marks should be left by the friction of the deceased when the deceased struggled, and are not the cause of death."

"There is no obvious external scar on the surface of the deceased. Could it be that he was tied up and thrown into the water and drowned alive? Or was he committed suicide?" Song Yuner touched her chin and pondered as if she was very experienced.

"You can't draw such a conclusion yet, because at least there is still a place on the surface of the body that has not been checked, so check it first." Yang Qiuchi carefully looked at the deceased's hair. Suddenly, his hand stopped, "The deceased had a scalp laceration on his head!"

"Let me see!" Song Yun'er leaned over and looked. Sure enough, the scalp on the back of the deceased's head was cracked, splitting the crack and you could see the white skull.

Yang Qiuchi first measured the size of the crack, then carefully identified the wound switch, and couldn't help but exclaim.

"What's wrong?" Song Yuner stared at the wound, looked left and right and didn't understand.

Yang Qiuchi looked at Song Yuner and said, "Yun'er, you have been with me for so long. I have taught you how to identify wounds. Look, what was the deceased's wound cut?"

Song Yuner put her head on the back of the deceased, looked at it for a long time, and said, "It doesn't look like it was cut by a knife."

Yang Qiuchi nodded in praise: "Why?"

"You have said before that the wound wall of sharp devices is smooth, and there is no inter-organizational bridge in the cavity. The wound wall is not very smooth." Song Yuner has a good memory. She remembered all the forensic nouns that Yang Qiuchi said before, and also knew how to use it.

"It's very good," Yang Qiuchi praised: "This wound was indeed not slashed by a sharp weapon."

"What cuts that?"

Yang Qiuchi used a scalpel to cut the scalp on both sides of the wound, exposing the wound, wiped the skull under the wound with a sweat towel, and said, "Please note that there is a thin fracture line, and there are no scratches on both sides of the fracture line. Since the hardness of the human skull is similar to that of copper, since this weapon does not leave any traces on the skull, it means that the hardness of the weapon is softer than that of copper, and it is probably a wooden stick or something."

"Milling sticks? Can wooden sticks cut out wounds?"

"Ordinary wooden sticks are blunt objects, and it is difficult to form such wounds. Therefore, the wooden stick should be diamond-shaped."

"Oh," Song Yuner understood and asked again: "Then was this man beaten to death by this diamond-shaped wooden stick?" Then she thought that Yang Qiuchi had just said that this man drowned in water before his death, so how could he be beaten to death by a wooden stick, so she quickly changed her words: "No, it should be said that he was knocked unconscious by a wooden stick, and then tied up a stone and sank into the water and drowned, right?"

"Well, the murderer's wooden stick only caused a linear fracture of the deceased's skull, which can cause trauma such as concussion or intracranial hemorrhage. However, judging from the blow, it is unlikely that the victim will die on the spot. According to the corpse examination just now, the deceased was drowned, which means that the victim was still alive after being sunk into the water after being hit by the stick."

"Then have you found the clues to the murderer?"

Yang Qiuchi smiled bitterly: "You are always so anxious. I am not a god. How can I know who the murderer is at once? However, I already have a direction for the detection."

"Really? What direction?" Song Yuner asked anxiously.

Yang Qiuchi walked to the Ba River, observed the river's flow rate for a while, and said, "Although the iron chain tied to the deceased's neck tied the stone, the stone was not too heavy. The water flow of the Ba River is relatively turbulent and should be able to rush the body down. Therefore, the place where the water falls may be somewhere upstream, but not too far."

Then he ordered the constables to go up the river and search carefully for any unusual traces of blood or fighting. In addition, they put some water here and within ten miles upstream in bottles at any distance and brought them back, and marked them to indicate where they were extracted.
Chapter completed!