Chapter 178 Evidence at the crime scene
The first step in on-site investigation is to take photos.
At the northeast corner of the cordon, Lu Chuan set up a tripod to take panoramic photos.
Because it was temporarily unclear whether it was the scene of the first crime, Lu Chuan needed to go through the entire on-site investigation and photography process.
This set of procedures has long been imprinted in Lu Chuan's mind and can be completed in dozens of minutes.
While the current investigation continues, Qin Yong and others are also learning about the case.
The person who reported the situation was Wang Jian, the director of the Xijiao Police Station.
"Team Qin, we received the report at 10:30 in the morning."
Wang Jian pointed to a middle-aged man in a white Jetta police car who was taking notes.
“The vineyards here are purchased by Xijiao Lexiang Biotechnology Co., Ltd. and farmers, and they are mainly planted with wine grapes.”
"Every spring, they and the village hire a well maintenance team to perform maintenance and inspections on more than 30 wells in the vineyard."
"The water output of the No. 3 well is small during maintenance. According to their According to experience, something was blocked, so we carried out salvage. "As a result, the body was recovered."
"What is the specific condition of the deceased?"
Qin Yong's face was ashen. The murder of a minor had not happened for a long time. The last case was three years ago.
A primary school student was strangled to death by a drunk man when he came home from school.
"The deceased's name is Wang Zihan, a sixth-grade student at the farm in the western suburbs."
"I reported missing two days ago, but I didn't expect..."
Children are missing, No matter where it is, it is a major case and must be filed immediately for investigation.
Wang Jian then reported on how they received the case.
Two days ago, Wang Zihan left home at 7:30 in the morning and walked to school.
"Wang Zihan's home is about three kilometers away from the school. He has been walking to school since the first grade."
"Has he always walked to school alone?"
Wang Jian Shaking his head: "The vineyard contracted by Wang Zihan's family is far away from the village. After the winter, they live next to the vineyard. They are the only family."
"When the children go to school, they will not leave first. After arriving two kilometers away, we passed by the natural village where their home is located. There were many students there, most of them walking together.”
"Can the time of the child's disappearance be determined?"
Qin Yong asked, while Sun Jun was taking notes.
“It was the school teacher who discovered that the child was missing. The school ended at 4:30 pm. Wang Zihan’s head teacher called Wang Zihan’s parents at 4 pm and asked why the child did not come to class.”
"The child's mother said that the child had gone to school early in the morning. Only then did she realize that the child was neither at school nor at home. After that, the child's mother called the police."
Wang Jian had a very detailed understanding of the entire process of the child's disappearance.
"The time we received the missing report call was 4:08 two days ago."
"After that, we organized manpower to search for the child along the path he took to school."
" But two days have passed, and nothing valuable has been discovered."
"Is there surveillance on the road?"
Wang Jian shook his head: "There are large vineyards here in the western suburbs. Important intersections and some grape growers conduct surveillance in their own yards, but most road sections do not have surveillance.”
"Have you determined the approximate section of road where the child disappeared?"
Wang Jian nodded affirmatively: "The section of road where the child disappeared should be the section between home and natural village."
< br>“Because the child’s deskmate is in Ziziantun, and he waits for him every day at school, but on the day of the incident, Wang Zihan’s deskmate did not wait for him.”
“In addition, there is a boy at the east end of Zizihan. Although the surveillance is not high-definition, it is operating normally. We checked the surveillance and found that Wang Zihan was not seen passing by on the day of the incident. "
"Is that a must-have road for school? "
"Yes, all the children pass there. Although they can pass through the vineyards on both sides of the village, the snow in the farmland has melted and is wet, so the children should not be able to go around there."
Wang Jian The reported situation has been very detailed, and Qin Yong already has an overview of the case.
After thinking for a moment, Qin Yong pointed to the shaft where the body was found: "How far is the No. 3 shaft from the section of road where the child disappeared?"
"About three kilometers." Three kilometers...
With such a long distance, it is unlikely that a child could walk alone.
“Are there any suspicious persons?”
“Not yet. Our main focus in the past two days has been on finding the child, and we haven’t had time to conduct a family background check on the child’s parents. ”
Wang Jian understood what Qin Yong meant. If the child was killed, if the other party did not commit the crime accidentally, it is likely to be related to the child’s parents.
For example, if a child's parents offend someone, the other party commits a revenge crime.
But as Wang Jian said, the child is missing and the key is to find the child.
But unexpectedly, what was finally found was a corpse.
Onsite.
Lu Chuan has completed taking photos around the scene and is conducting surface inspection of the corpse.
"The left ear is missing and has tooth-like 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. It should be death from suffocation."
"Ding!"
"Advanced mission : Find the scene of the first crime, and identify the suspect through on-site investigation evidence.”
While Lu Chuan was making scene investigation records, the system issued a task.
“This should not be the scene of the first crime.”
Lao Bai pointed to the edge of the motor shaft: "Look here."
Lu Chuan and Liu Guodong came over and looked at the edge of the motor shaft that Lao Bai pointed at.
There are some minor scratches.
“There are traces of friction on the right leg and ankle of the corpse, and the skin is damaged, but the wound characteristics have no activation reaction. Combined with the traces on the edge of the well, it should be left by friction when the murderer threw the body.”
What Lao Bai said is that if this was the first scene, then the murderer would have dumped the body immediately after killing the child.
As for the corpse that had just died, the blood had not coagulated and could still bleed. However, there was obvious skin tissue on the scratches, but no blood stains.
The wound on the child's leg did not activate, which means that the body of the child was thrown into the well after a period of time after death.
"The child was killed after missing. We will ask later if we can determine the location of the child's disappearance, and then we will investigate."
Liu Guodong's opinion is also Lu Chuan's idea, here It was not the scene of the first crime, and it had been destroyed by the well maintenance team to recover the bodies, so it had no exploration value.
"The child's left ear is partially missing. Judging from the traces, it is tooth marks. I want to collect trace evidence 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 humans and are most likely left by the murderer.
In fact, in criminal investigation technology, there is a special research discipline on tooth marks.
Each person’s bite marks have their own characteristics due to the different interocclusion gaps and different degrees of tooth wear.
Therefore, bite marks can also be used as forensic evidence, but there are very few people who are proficient in this skill.
At least there are no talents in this field in Haizhou City.
Of course Lu Chuan is not proficient in it. The skill of tooth mark identification and analysis is available in the system, but Lu Chuan has not chosen it.
The trace evidence analysis he wanted to do was to test whether the murderer's saliva could be extracted from the wounds on the corpse.
Then the DNA information of the murderer is determined.
Liu Guodong also knew what Lu Chuan was thinking. Lu Chuan had also used trace evidence analysis to solve cases before.
And now there is a little convenience. The current investigation office's own trace evidence laboratory has just been inspected and can be used. There is no need to ask the provincial department for help.
But the problem is that the body has been soaked in the well.
“Can the murderer’s saliva be collected from the wound?”
“It’s really unlikely,” Lu Chuan also knew that it would be difficult to extract DNA test materials from soaked wounds. : "But I have to try anyway."
(End of this chapter)