The first step of the on-site investigation is to take pictures.

At the northeast corner of the cordon, Lu Chuan set up a tripod to take panoramic photos.

Because it is not possible to determine whether it is the scene of the first crime for the time being, Lu Chuan needs to go through the entire process of on-site investigation and photography.

This set of processes has long been imprinted in Lu Chuan's mind, and it can be completed in dozens of minutes.

While the current investigation was continuing, Qin Yong and others were also learning about the case.

The person who reported the situation was Wang Jian, director of the western suburbs police station.

"Team Qin, we received the report at half past ten in the morning."

Wang Jian pointed to a middle-aged man in the white Jetta police car who was taking notes.

"The vineyards here are the ones where Xijiao Lexiang Biotechnology Co., Ltd. has signed purchase contracts with farmers, and mainly grows grapes for winemaking."

"Every year at the beginning of spring, they and the village hire a well maintenance team to repair and inspect more than 30 wells in the vineyard."

"The water output from the No. 3 machine shaft was small during the maintenance, and according to their experience, something should have been blocked, so they carried out the salvage."

"As a result, the body was recovered."

"What happened to the deceased?"

Qin Yong's face was pale, the case of the murder of a minor had not happened for a long time, and the last case was three years ago.

An elementary school student, on his way home from school, was strangled to death by a drunk man.

"The deceased's name is Wang Zihan, and he is a sixth-grade student at a primary school in the western suburbs."

"I reported my disappearance two days ago, but I didn't expect it to ......."

The disappearance of a child, no matter where it is, is a major case, and it must be immediately filed and searched.

Wang Jian then reported on their case.

Two days ago, Wang Zihan left home at half past seven in the morning and walked to school.

"Wang Zihan's house is about three kilometers away from the school, and he has been walking to school since the first grade."

"Has he always walked to school alone?"

Wang Jian shook his head: "The vineyard contracted by Wang Zihan's family is far away from the village, and after winter, they live on the edge of the vineyard, just their family."

"On the way to school, the children will walk less than two kilometers by themselves, and then pass by the natural tun where their home is located, where there are many students, and most of them will walk together."

"Can you be sure when the child went missing?"

Qin Yong asked, and Sun Jun took notes on the side.

"It was the school teacher who found the child missing, and the school ended class at 4:30 p.m., and Wang Zihan's homeroom teacher called Wang Zihan's parents at 4 p.m. and asked why the child didn't come to class."

"The child's mother said that the child went to school early in the morning, and then she knew that the child was neither at school nor at home, and then the child's mother called the police."

Wang Jian knows the whole process of the child's disappearance in great detail.

"We received a missing person call at 4:08 two days ago."

"After that, I organized people to follow the path of the children to school."

"But two days have passed, and nothing of value has been discovered."

"Is there surveillance on the road?"

Wang Jian shook his head: "There are large vineyards in the western suburbs, and most of the roads are not monitored, except for important intersections and the monitoring of some grape growers in their yards."

"Is there an approximate route to determine where the child went missing?"

Wang Jian nodded affirmatively: "The section of the road where the child disappeared should be the road from home to Tiantun."

"Because the child's table mate is in Naturetun, he will wait for each other every day when he goes to school, but on the day of the crime, Wang Zihan's tablemate did not wait for him."

"In addition, there is a surveillance at the east end of the natural tun, although it is not high-definition, but it is operating normally, we checked the surveillance, and we did not see Wang Zihan passing by on the day of the crime."

"Is that the way to school?"

"Yes, all the children passed through there, and although they could pass through the vineyards on both sides of the tunzi, now the snow is melting and wet

yes, the kid shouldn't go around that way."

Wang Jian's report on the situation has been very detailed, and Qin Yong already has an overview of the case before and after.

After thinking for a moment, Qin Yong pointed to the well where the body was found: "How far is the No. 3 well from the section where the child disappeared?"

"About three kilometers."

Three kilometers ......

At such a distance, it is unlikely that the child will come alone.

"Is there any suspicious person?"

"Not yet, our main focus in the past two days has been on finding the child, and the family background check of the child's parents has not yet had time."

Wang Jian understood what Qin Yong meant, if the child was killed, if the other party did not commit the crime by accident, it was very likely to be related to the child's parents.

For example, if the child's parents offend someone, the other party is a revenge crime.

But as Wang Jian said, the child is missing, and the focus is to find the child.

But unexpectedly, in the end, it was a corpse that was found.

Scene.

Lu Chuan has completed taking pictures around the scene and is conducting an autopsy on the corpse.

"Left ear missing, toothed bite marks."

This is the most obvious sign of damage on the corpse: "There are obvious pinch marks on the neck, and the lips and face are purple, which should be death by asphyxiation."

"Ding!"

"Advanced Mission: Find the first crime scene, and identify the suspect through on-site investigation evidence."

When Lu Chuan was making a survey record, the system released the task.

"This shouldn't be the scene of the first crime."

Lao Bai pointed to the edge of the shaft: "Look here."

Lu Chuan and Liu Guodong came over and looked at the edge of the well that Lao Bai pointed to.

It's a slight scratch.

"The corpse's right leg and ankle have friction marks, and the skin is broken, but the wound features do not activate the reaction, combined with the marks on the edge of the shaft, which should be left by the friction of the murderer when he threw the body."

What Lao Bai means is that if this is the first scene, then the murderer should throw the body as soon as he kills the child.

The corpse that has just died, the blood has not coagulated, and it can still bleed, but there is more obvious skin tissue on the abrasions, but there is no blood.

The wound on the child's leg did not activate the response, indicating that the child was thrown into the well after some time after death.

"The child was killed after he disappeared, and we will ask if we can determine the location of the child's disappearance, and then we will investigate." Look at the book

Liu Guodong's opinion is also Lu Chuan's idea, this is not the scene of the first crime, and after the destruction of the body recovered by the well maintenance team, there is no longer any investigation value.

"The child's left ear is partially missing, and judging from the traces, it is a tooth mark, and I want to do a trace physical evidence collection first to see if I can find it."

The missing scar on the left ear of the corpse was also seen by Liu Guodong and Lao Bai.

What is certain is that the bite marks belong to humans, and it is very likely that they were left by the murderer.

In fact, in criminal investigation technology, there is a research discipline that specializes in tooth marks.

Each person's tooth marks have their own characteristics because of the different gaps between the bite of the teeth and the different degrees of tooth wear.

Therefore, bite marks can also be used as evidence for forensics, but there are very few people who are proficient in this skill.

At least there are no talents in this area in Haizhou City.

Of course, Lu Chuan is not proficient, and the skill of tooth mark identification and analysis is available in the system, but Lu Chuan has not chosen it.

The trace physical evidence analysis he had to do was to try to see if he could extract the murderer's saliva from the wound of the corpse.

And then determine the DNA information of the murderer.

Liu Guodong also knew Lu Chuan's thoughts, and Lu Chuan had also used trace physical evidence analysis to solve cases before.

And now there is a little convenient place, the current investigation office's own trace evidence laboratory has just finished acceptance, just able to use, no need to ask the provincial department for help.

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The problem is that the corpses have already been soaked in the machine well.

"Can the killer's saliva still be collected from the wound?"

"It's really unlikely," Lu Chuan also knew that it was difficult to extract DNA samples from soaked wounds, "but you have to try it anyway."