When doing a murder case, the biggest fear is that there are no clues.
As long as there are clues, there will be no shortage of manpower.
It's like someone used a gun to commit murder and then ran up the mountain. A search team of thousands of people could be organized in the local area in minutes.
Many murder case task forces organize large-scale investigations, sometimes just to use the human resources at hand as much as possible. Regardless of whether it is sufficient or not, or necessary or unnecessary, at least the personnel of the task force have something to do.
Having nothing to do would be a huge blow to the morale of the task force.
Jiang Yuan submitted the clues, and the 724 Qinghe Major Homicide Task Force sent people to start the investigation that night.
18 years old is a senior or freshman in high school, and studying ballet proves that the family conditions are good, so the deceased is probably still a student.
After pulling out the list of missing students in Qinghe and several surrounding cities, and adding the attribute of having studied ballet, even if it goes back several years, the list is only one person.
Zhang Xiaoyun.
He is from Jianjiang City and is a student of Jianjiang City No. 1 Middle School.
Jianjiang City is adjacent to Qinghe City, and its economic level is not much different from Qinghe City. There is only one training institution teaching ballet in the city, so it is very convenient to find one.
But after the DNA comparison and matching, members of the task force were still a little scared.
Purely because the condition of ballet is too narrow, they can easily expand the search scope to several nearby cities... and this once again proves one thing:
The murderer didn't just stick to his local area to kill people.
This is very inconsistent with modern trends.
The current business atmosphere and cultural atmosphere are all about localization and are beginning to focus on circles.
Even blind daters have begun to add the first 6 digits of their ID number in front of the requirements for owning a car and a house.
Killing someone without looking at their ID number...
Of course, it is easy to understand if a murderer is a little rebellious.
But members of the task force had to start self-reflection:
The murderer doesn't pay attention to localization of his killings, so how wide is his scope?
This is not purely a joke.
The murderer's murderous psychology will change according to the environment.
Some murderers will become unscrupulous and aggressive when they are away from home, but when they return home, they can still be obedient and eat and drink when they should. Even if they are beaten by their wives or angry with their bosses, they have not changed at all.
Some murderers specialize in killing people in one place, and this is the mainstream. Especially those who like to dismember bodies, most of them will do so in their own homes.
Reality often responds to this choice in a strange way.
A typical case is Jia Wenge from Nehe City. He and his team members killed 42 people in the local area. They worked for more than three years and attracted a special task force, but nothing happened.
In order to avoid the limelight, he ran away to Hangzhou and worked a few times, but he didn't even dare to kill anyone, so he was arrested and shot dead three months later.
The murderer of Case 724 is said to be familiar with the reservoir and has dumped corpses here all year round, so he should also be local.
But the only two sources of corpses are not local.
Deceased No. 1 came from Wanxiang City in the far west of Shannan Province. He probably went to Qinghe City on a business trip and died in Qinghe City. But it is also possible that he died outside Qinghe City, such as Jianjiang City.
Now, deceased number 5 was directly a student in Jianjiang City. His mobility was limited, so he probably died in Jianjiang City.
So, the murderer lives in Jianjiang City, which is adjacent to Qinghe City?
It is not unusual to specifically abandon corpses to the next city. Anyone with some counter-reconnaissance capabilities knows that this will increase the difficulty of detection. Ancient bandits also knew to choose a place at the junction of three provinces.
But for the task force, the difficulty seems to have really increased.
For two days in a row, the conference room of the Qinghe Municipal Bureau was filled with the sounds of various quarrels.
Fortunately, Jiang Yuan no longer has to go to meetings.
He stayed in the anatomy room and studied bones every day.
These corpses have been soaked in water for a long time, and most of the skin and flesh have rotted away. The exposed bones have been soaked in a large amount of corpse water, and the color and texture of the bones have changed to varying degrees.
This change is not a problem for some basic judgments.
Just like determining gender, the pelvis is the most useful, but it is not indispensable. The hip bones are equally good and good, and there is no problem with the skull. The mandible, sternum and femur can all be used.
On this basis, even if the bones have been soaked for a long time or eaten by some microorganisms, they will not have much impact.
But it is obviously more difficult to further determine the source of the corpse.
The remaining corpses No. 2, 3, 4, and 6 each have their own complexities.
The four dissecting tables in the dissecting room display exactly four corpses.
Wang Lan assigned a corpse to each of the forensic doctors, but he only crossed Jiangyuan.
The first two corpses all relied on Jiang Yuan's judgment. Therefore, his knowledge of forensic anthropology is obviously sufficient for the job. It may even be far superior to everyone else.
Wang Lan couldn't do anything more than give him full trust.
On the first day, Jiang Yuan paraded in front of four corpses.
After that, Jiang Yuan spent more and more energy on the skeleton No. 3.
Bone No. 3 is the bone that was chopped with an axe.
The lumbar vertebrae and leg bones of this corpse were severely worn, and Jiang Yuan initially concluded that the corpse was engaged in physical labor.
Of course, there is no problem with this judgment, but the scope is too large, and it is basically impossible to find someone for this.
Initially, Jiang Yuan was prepared to study the traces of the axe.
If the type of ax can be determined, even if the case cannot be solved, certain clues can still be obtained. For example, for example, fire axes that are common nowadays, or small axes for cutting firewood, etc., there will definitely not be many people buying them.
Facts have proved that Jiang Yuan still underestimated the tool mark inspection. With his skills in this field, he could not find out the origin of the axe.
Judging the time of death...this path is naturally even more impossible.
The underwater world is a closed world. To judge the time of death of a corpse that has aged so long, you usually have to ask for help from the outside world. For example, look at how many generations the maggots have reproduced and how long the algae has grown...
Not to mention that the conditions are not quite met, but even if they are met, the time of death can only be estimated in years.
In fact, the judgment of the time of death is the most difficult and profound part of forensic medicine. In other words, it is the most inaccurate.
If you encounter a corpse that is fresh and still hot, and you can still measure the liver temperature and anus temperature, you can measure it. The old corpse is so old that the liver is gone, the anus is gone, and the microorganisms are not updated.
Already...
In the end, what Jiang Yuan could study were the simplest traces on bones.
Theoretically, bones can provide a corpse with many traces of its life, not only life, but also work, disease, or environment.
An example suitable for modern people, if 20 people were killed in the subway, the skin and flesh were cooked, and only the bones were observed, what would be the most common traces of the bones?
The incidence of excessive wear and tear on the cervical spine must be extremely high.
Jiang Yuan had already seen the wear and tear on the lumbar vertebrae and leg bones of Corpse No. 3. After further observation, he finally judged that the wear and tear on his knees, tibia, and even heels should have come from daily life or occupation.
Jiang Yuan was a little confused as to what occupation would wear down these positions.
He thought about the time for instant noodles. Without thinking clearly, he called Liu Jinghui directly.
In Jiang Yuan's opinion, Liu Jinghui, who is engaged in reasoning, may be of some use at times like this.
Liu Jinghui, the fourth-level senior police sergeant of Shannan Provincial Department, rushed to the autopsy room after receiving the call.
Jiang Yuan found him a protective suit and said, "You don't actually need to come over. We can just talk on the phone."
Liu Jinghui shook his head: "There are many things that can only be understood clearly by seeing them in person."
"Okay." Jiang Yuan led him to the dissection table No. 3, handed him a tibia, and said, "See for yourself."
The tibia is the lower leg bone, or to be more precise, it is the relatively large inner bone of the lower leg.
It is very hard and can be held with just one hand - the smart ancients discovered the properties of the tibia very early, so thousands of years ago, they ground the tibia into a dagger with a slit in the middle.
The blood tank.
Judging from the shape of the unearthed cultural relics, the tibia is still very good as a dagger material.
However, just as evidence, Liu Jinghui looked over and over for a long time and saw nothing.
"Please explain it to me." Liu Jinghui sighed.
Several forensic doctors also quietly came over, wanting to hear Jiang Yuan's live lecture.
"The wear and tear is mainly here. The bone has become rough." Jiang Yuan held the tibia in his hand and showed the selected side to Liu Jinghui.
Liu Jinghui still didn't see it.
"So I said, just talk on the phone." Jiang Yuandao.
"It's not that far anyway." Liu Jinghui argued, then turned his attention back to the corpse and asked, "What kind of movements did you make the wear and tear you mentioned?"
"Maybe I squat a lot." Jiang Yuan said and simulated.
Liu Jinghui looked carefully and nodded slightly: "Knee, tibia, heel."
Jiang Yuan nodded: "It's a pity that he is a man. If he were a woman, she might be in the service industry."
"Ouch..." Liu Jinghui clicked his tongue twice and looked at Jiang Yuan: "You know very well. You are worthy of being from Jiangcun. At such a young age..."
"I'm talking about waiters, like shoe sales, or first class flight attendants."
"Men can also do these jobs. Should gender be so restricted?" Liu Jinghui joked first.
Jiang Yuan pouted: "Heavy physical strength."
"A first-class flight attendant who often carries luggage. Or a part-time shoe salesman who works at a courier store at night?"
"I'm just giving an example." Jiang Yuan shook his head and said, "Judging from the age of the deceased, the time he spent squatting every day was much longer than in a profession like selling shoes."
"Welder?"
Jiang Yuan hesitated for a moment, nodded and said, "It's possible."
"Athletes of some kind of sport, like skiing?"
"Also a possibility."
Liu Jinghui guessed a few more professions and almost understood Jiang Yuan's judgment.
"This murderer kills people very casually." Liu Jinghui sighed.
Jiang Yuan said "Yes", placed the tibia, looked at the other corpses, and asked Liu Jinghui, "How is the task force doing?"
"It's just chicken feathers all over the place." Liu Jinghui said in a deep voice.
"Didn't the provincial department send you to provide staff and command?" Jiang Yuan looked at Liu Jinghui.
"My judgment is that this person probably committed the crime randomly." Liu Jinghui also looked at Jiang Yuan: "Do you know how to solve this kind of case?"
Jiang Yuan shook his head. Among the backlog of murder cases in various provinces, random crimes account for more than half. It is not without reason.
"You have to pile up known conditions. You have to find order from disorder and list the known conditions. This is the most basic step." Liu Jinghui said: "I called two more teams of frogmen to see if there are any.
Are there any corpses in the reservoir? If they can't be retrieved, the few existing corpses are all we know."
