Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Chapter 178 Evidence at the crime scene

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

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

Because it is temporarily uncertain whether it is the scene of the first crime, Lu Chuan needs to go through the entire on-site survey and photography process.

This set of procedures has long been printed in Lu Chuan's mind, and it can be completed in a few ten minutes.

While the current investigation is continuing, Qin Yong and others are also learning about the situation of the case.

The person who reported the situation was Wang Jian, director of the Xijiao Police Station.

"Captain Qin, we received the report at 10:30 in the morning."

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

"The vineyards here are purchased by Xijiao Lexiang Biotechnology Co., Ltd. and farmers, mainly planting grapes for winemaking."

"At the beginning of spring every year, they and the village hire a motorized well maintenance team to conduct maintenance and inspection of more than [-] motorized wells in the vineyard."

"During the maintenance of the No. [-] machine shaft, the water output was small. According to their experience, there should be something blocked, so they salvaged it."

"As a result, the body was recovered."

"What about the deceased?"

Qin Yong's face was ashen. It has been a long time since the murder of a minor happened. The last case was three years ago.

A primary school student was strangled to death by a drunken man on his way home from school.

"The name of the deceased is Wang Zihan, a sixth grade student at Xijiao Farm."

"Reported missing two days ago, I didn't expect..."

Missing children, no matter where they are, are serious cases, and must be filed immediately to search for them.

Wang Jian then reported the situation of their cases.

Two days ago, Wang Zihan left the house at 07:30 in the morning and walked to school.

"Wang Zihan's home 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. After winter, they will live beside 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 village where their home is located. There are many students there, and most of them will go together."

"Can you determine when the child disappeared?"

Qin Yong asked, while Sun Jun took notes.

"It was the school teacher who found the child missing. The school closed at 04:30 p.m., and Wang Zihan's head teacher called Wang Zihan's parents at [-] p.m. to ask why the child didn't come to class."

"The mother of the child said that the child had gone to school early in the morning, and only then did she know that the child was neither at school nor at home. Afterwards, the mother of the child called the police."

Wang Jian has a very detailed understanding of the entire process of the child's disappearance.

"The time we received the missing report call was [-]:[-] two days ago."

"Afterwards, we will organize manpower to search along the path for children to go to school."

"But two days passed, and nothing of value was found."

"Is there surveillance on the road?"

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

"Have you determined the approximate route where the child disappeared?"

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

"Because the child's deskmate is in Zirantun, they would wait for him every day when they go to school, but on the day of the incident, Wang Zihan's deskmate did not wait for him."

"In addition, there is a surveillance camera at the east end of Zirantun. Although it is not high-definition, it is operating normally. We checked the surveillance and did not see Wang Zihan passing by on the day of the incident."

"Is that the way to go to school?"

"Yes, all the children passed by there. Although the vineyards on both sides of the village can also pass through, but now the snow on the farmland has melted and is wet. The children should not go around there."

The situation reported by Wang Jian has been very detailed, and Qin Yong has an overview of the before and after of the case.

After thinking for a while, Qin Yong pointed to the motorized well where the body was found: "How far is the No. [-] motorized well from the road where the child disappeared?"

"About three kilometers."

Three kilometers...

With such a long distance, it is unlikely that the child will walk 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 investigation of the child's parents has not yet been carried out."

Wang Jian understood Qin Yong's meaning. If the child was killed, if the other party did not commit the crime by accident, then it is very likely that the child's parents were related.

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

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

But unexpectedly, what was found in the end was a corpse.

on site.

Lu Chuan has finished taking pictures around the scene and is investigating the surface of the corpse.

"Missing left ear, toothed bite mark."

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. It should be a suffocation death."

"Ding!"

"Advanced task: Find the first crime scene, and locate the suspect through on-site inspection evidence."

While Lu Chuan was recording the site survey, the system issued a task.

"This should not be the scene of the first crime."

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

Lu Chuan and Liu Guodong leaned over and looked at the edge of the well that Lao Bai was pointing at.

There are some minor scratches.

"The right leg and ankle of the corpse have friction marks, and the skin is damaged, but the characteristics of the wound have not activated. Combined with the traces on the edge of the well, it should be left by the friction when the murderer threw the body."

What Lao Bai said was that if this was the first scene, then the murderer should throw the body away immediately after killing the child.

As for the corpse that had just died, the blood hadn't coagulated and could still bleed, but there were more obvious skin tissues on the scratches, but there was no blood.

The wound on the child's leg did not activate, which means that the child was thrown into the machine well after a period of time after death.

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

Liu Guodong's opinion is also Lu Chuan's idea. This is not the first crime scene, and it has been destroyed by the machine well maintenance team to salvage the corpses, so it has no investigation value.

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

Liu Guodong and Lao Bai also looked at the missing scar on the left ear of the corpse.

What is certain is that the bite marks belong to human beings, and are most likely left by the murderer.

In fact, in criminal investigation technology, there is a special research discipline on tooth marks.

The tooth marks of each person, because the gaps between the teeth are different, the degree of tooth wear is different, and the bite marks are also unique.

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

At least in Haizhou City, there are no such talents.

Of course, Lu Chuan was not proficient either. The skill of identification and analysis of tooth marks was available in the system, but Lu Chuan hadn't chosen it.

The trace evidence analysis he wants to do is to test whether the murderer's saliva can be extracted from the wound of the corpse.

Then determine the DNA information of the murderer.

Liu Guodong also knew what Lu Chuan was thinking. Lu Chuan had also used trace evidence analysis to solve the case before.

And now there is a little convenience, the current survey office's own trace evidence laboratory has just passed the inspection and acceptance, and it can be used just right, so there is no need to ask the provincial department for help.

But the problem is that the corpse has been soaked in the machine well.

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

"It's really unlikely." Lu Chuan also knew that it would be very difficult to extract DNA samples from soaked wounds: "But we have to try."

(End of this chapter)