Chapter 187: Corpse Source

Chapter 188 Corpse Source

Inferring the condition of a corpse through a certain bone is basically based on statistics.

For example, it is easy to judge height based on long bones. That is, the thigh bone, calf bone, and humerus of the upper limb, etc.-it is easier to understand with the description at the pork stall, it is a tube bone.

The common saying among the people, "This child has long calves, he will be tall when he grows up" is essentially similar to the judgment model of forensic doctors.

However, if we really want to talk about accuracy, there are also problems.

If height is the target, there will definitely be a difference between a long-legged model and a short-legged model based on the long bones.

For this reason, forensic doctors began to make various regression equations based on bones at different locations to determine height.

The same goes for the lumbar spine.

It's just a little more complicated.

For example, we must first distinguish between men and women.

Secondly, the first to fifth lumbar vertebrae are different.

Each lumbar vertebra has ten measurement points, including the anterior height of the vertebral body, the posterior height of the vertebral body, the superior vertebral body sagittal diameter, the inferior vertebral body sagittal diameter...

There are a total of 19 types of regression equations formed in the end.

It's annoying to memorize it.

Normal people are unlikely to recite this kind of regression equation. They just know where to look it up.

But Jiang Yuan took the LV3 Forensic Anthropology script, so he couldn't look it up. Memorizing it directly would be better.

For laymen, this will most likely be untouchable.

It's different for people in the industry.

Just like ordinary people buy a reference book such as "Anthropometric Manual", they can also specially choose one published by Cihai Publishing House. The result was Jiang Yuan, who seemed to have memorized the "Anthropometric Manual".

In any workplace, who would not be confused when encountering such a colleague?

Jiang Yuan didn't have anything to say. He just measured a few more data with a ruler and silently checked it several times. It doesn't feel like a big difference.

Things like regression equations can originally be understood as formulas for summarizing experience. The formula is there and the data is here. When you put it in, you will get whatever result you get.

A young doctor secretly washed his gloves, took them off, washed his hands again, put on new gloves, then searched his cell phone, and came to the same conclusion.

Then he quietly cooked the bones.

Wang Lan pondered and said: "There shouldn't be many people like this 40-year-old woman who is 1.7 meters tall in Qinghe City."

"I'm afraid he's not from Qinghe City. He was thrown far away and buried close to home." Another city bureau forensic doctor muttered slightly.

Fortunately, it was Wang Lan who took the lead this time. He really had no confidence at all in the case in front of him.

If a murderer kills one person, he may be full of flaws. If he kills four people, he should have gained some experience.

Some of the forensic doctors here have never participated in four dismemberment cases.

And the handling of these four corpses was really good. If the water in the reservoir hadn't dropped to a historically low level, no one would have known there were corpses here in a few decades.

Wang Lan frowned and said: "It is indeed a general rule to throw them far away and bury them close, but these corpses are closer to burial than simply throwing them away. Moreover, four times in a row, in the same place, they are not buried. Like it’s too far away.”

Throwing things far away and burying them close is a rule summarized by criminal investigators.

Generally speaking, when the murderer dumps the body, if the distance is far away, he will choose to dump the body directly, and if the distance is close, he will choose to bury the body.

This is very interesting psychology.

In fact, it is naturally more difficult to dump and bury the body from a long distance. But in actual operation, the murderer is in a strange place and obviously does not want to stay too long. In other words, there is actually a range of time that the murderer is willing to spend disposing of the body...

What the two discussed was actually this issue.

Are the corpses in the reservoir considered dumped or buried?

The core point of burying corpses actually takes time to excavate. Because the murderer feels very insecure in a strange place, the murderer is usually reluctant to spend too much time and energy digging in a place far away from his familiar place and far away from the center of his life and work.

But it is impossible to say that the murderer did not want to dump the body in a more secretive manner.

Therefore, sinking into a reservoir tends to throw the body away.

If so, it means that the source range of the corpse has been greatly expanded. The victim may not necessarily be from Qinghe City, or even die in a nearby city.

Just from the perspective of determining the source of the corpse, this level of difficulty is almost overwhelming.

Wang Lan shook his head slowly and continued: "My personal preference is to dump the body. I'll leave the specific investigation direction to the leaders."

Jiang Yuan listened silently.

He also prefers corpses to be nearby. However, this is not an exclusive answer, and unexpected situations may still occur.

However, even if Jiang Yuan were to be the person in charge, he would come to the same conclusion as Wang Lan. Otherwise, this case would be too difficult to handle from a forensic perspective.

Through the technology of forensic anthropology, searching for the source of corpses is essentially looking for intersections, just like drawing circles on a blackboard and constantly looking for the intersection points of these circles. In the end, when the number of people intersecting is small enough, it will be easier to The source of the body was found.

For example, the corpse numbered 1 in front of me is a circle for women, another circle for those around 40 years old, another circle for those who have given birth, and another circle with a height of 1.7 meters.

If the circle that meets these conditions is added to the circle of missing people in Qinghe City, the final intersection will probably be only one, or at most a few people can meet it.

Then the source of the corpse can be basically determined.

And determining the source of the corpse is the first step in such cases. It can even be said that only when the source of the corpse is determined can the case be opened - this is also Wang Lan's job.

"That... Xiaozhuang, you make a record." Wang Lan pointed out the name of a young forensic doctor.

Xiaozhuang said "Oh" and immediately took off his gloves and washed his hands.

After a lot of trouble, the record was made and another pot of corpses was cooked.

Skim off the foam, pour out the corpse soup, fish out the bones with fascia, shovel them clean, and then unfold the characteristic bones on the second dissection table - the reason for skimming the foam is also the experience of the previous pot. If you just pour the soup, the foam will stick to the bones, and you have to work hard for two rounds of cleaning.

In this way, the dissection table is a little insufficient.

Four corpses are still too many. The dissection room in Qinghe City has already increased the demand, but one corpse cannot occupy two tables.

However, it is not okay to put the body bag with a plastic bag directly on the ground. The ground was full of sewage, and the plastic bag was actually part of the evidence...

So, it took another round of tossing and turning to lift the other two unopened body bags onto a dissection table, and then concentrate on dealing with the two unopened body bags.

There was one person in each body bag, and there were stones and water that might have seeped in. To lift it up high, three or even four people were required.

As a female forensic doctor, Wang Lan could only stand by and cheer...

An hour later.

The forensic doctors who went to eat came back, and at this time, the second body here was also sorted out.

"35 years old. Male. About 1.7 meters tall..." Jiang Yuan quickly gave a judgment.

Wang Lan agreed, muttering to herself: "There are both men and women, but the height is the same."

"Serial killers like to kill people who are 170 cm tall, regardless of gender and age." A forensic doctor made a personal summary.

Xiao Zhuang, who was taking notes nearby, couldn't help but look up and said, "Do you want to listen to what you are saying?"

"What?"

"In China, if someone likes to kill people who are 170 cm tall, he must be exhausted to death."

"Oh, there may be other superimposed factors..."

Xiao Zhuang was too lazy to talk to him, and said, "I think this way of throwing the body is a bit like the double-faced forensic doctor in American TV series. It is also called the bloodthirsty forensic doctor."

"I only saw the beginning, how did he throw it?" Wang Lan immediately paid attention. Copycats are a large category among murderers.

Xiaozhuang sorted out his words and said, "He often puts plastic in a container like a container, wraps himself up, wears protective clothing and masks. Then he strips the person naked and ties him to the table, kills him with a knife, cuts up the body, puts it in a plastic bag, and finally transports it to the sea and dumps the body."

Wang Lan pondered for a moment and said, "Then he needs to buy a lot of plastic sheets, a separate house or space, and protective clothing and masks. In addition, our murderer is definitely not a forensic doctor. He cuts up the body with something like an electric saw, and the plastic sheet can be easily punctured..."

"You also need a means of transportation. In addition, the body bag is too heavy, and one person may not be able to move it." Jiang Yuan said.

"So, it is possible that multiple people committed the crime?" Wang Lan's eyes lit up.

Jiang Yuan did not respond to his words, but fell into deep thought.

After a moment, Jiang Yuan slowly said, "I think, even if there are multiple people committing the crime, the body has been cut up like this, why do you need to put such a big body bag?"

Wang Lan raised his head in horror.

Jiang Yuan continued: "If he knows how to sum up experience, it would be much easier to pack the body into two or even four bags. The body sinks to the bottom because of the stone, not the weight of the body itself."

Not only Wang Lan, but everyone present swallowed their saliva.

"There are only four body bags at the scene, so if the crime escalates..." Xiaozhuang took a deep breath.

Jiang Yuan nodded and said: "If the crime escalates, the murderer is likely to choose deeper waters and smaller body bags."

"That makes sense." Wang Lan sighed heavily and said to Xiaozhuang: "Call the captain and ask them to find a frogman to go into the water to look for it."

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