Chapter 112 The sound of banging on the door
When Shen Yan and Lu Chuan were moving the body together, Shen Yan found that the body had softened and thawed.
But there is still a long way to go before autopsies can be performed.
There are strict procedures for dissecting a corpse.
Contrary to what most people think, when dissecting a corpse, you cannot just cut it open and take a look at it just because you think there is something wrong.
There is a strict order to dissection.
Starting from the inspection of wounds on the surface of the corpse, it is necessary to fill out the autopsy report.
Some are similar to a customized template set, from the position of the knife, the order of dissection, toxicology and pathology experiments, etc., from top to bottom, from outside to inside.
Although Lu Chuan is not a forensic doctor, he has also been exposed to some basic knowledge of anatomy.
After he and Shen Yan restored the body to a lying position, Lu Chuan and Shen Yan left together.
Today, most of the work is focused on crime scene visits and investigations.
Confirming the identity of the deceased is a top priority
Operation Group Sun Jun and others are responsible for following up the scene. There is also a robbery case on the side of Ren Qiang, the second group. They are very busy and can only let Zhang Hui brought an auxiliary police officer to participate in the investigation of surveillance videos.
There are only some old residential areas near the Qinghe playground construction site, and there are very few monitoring facilities. During the construction of the playground, they were almost demolished.
Within the inspection range, only the monitoring at the main entrance of the construction site is working normally.
But obviously, the murderer did not carry the body through the main entrance, and basically nothing was found in the surveillance.
After Lu Chuan completed the collection of trace evidence, there was still new work to follow up.
All the physical evidence found within a kilometer radius around the murder scene, especially inside and outside the wall, was brought back.
Including but not limited to mineral water bottles, cigarette boxes, cigarette butts, lighters, yogurt bottles, plastic bags, toilet paper, etc.
Although these things cannot all be left by the murderer, if they are not preserved, there may be items left by the murderer.
Maybe it was not left behind by dumping the body in the early morning, but since the murderer chose this dumping point, it means that the murderer was relatively familiar with the vicinity of the Qinghe playground construction site.
Since you are familiar with it, you may have been here more than once.
What Lu Chuan is doing now is to collect fingerprints and DNA samples from all the physical evidence found.
In terms of fingerprint collection, Lu Chuan has great confidence. He adopts different methods for different samples. Lu Chuan, who has mastered the intermediate fingerprint collection skills, can say that he has everything at his fingertips.
What is a little more troublesome is the collection of DNA test materials.
Generally speaking, DNA sample collection methods include blood stain sampling, hair sampling, nail sampling, cigarette butt sampling, oral swab sampling, toothbrush sampling, sperm spot sampling, chewing gum sampling, etc.
Each sampling method has different requirements.
As seen in TV dramas, it is mostly a joke that DNA information can be extracted by just wiping a cotton swab.
For example, hair sampling. Generally speaking, to ensure successful collection of hair DNA information, at least five hairs with clear hair follicles are required.
And the freshly plucked hair should be placed on clean white paper to dry for a few minutes before being put into the bag.
Cut or broken hair cannot be used.
Another example is oral swab sampling, which requires the person being collected to rinse their mouth with water to ensure that there are no food residues in the mouth.
Then use a medical cotton swab and wipe it repeatedly on the inside of the mouth and cheeks at least 30 times.
There are still steps to follow. Place the cotton swab in a clean place to dry in the shade. Do not dry it in the sun, blow dry it with a hair dryer or air dry it.
Finally, use the same method to collect at least three cotton swabs to ensure a successful DNA information test.
Therefore, there are definitely very few samples from which DNA information can be collected from the items found around the scene.
Lu Chuan carefully sorted the items, inspected them one by one, and then dried them in the shade when they should, and sealed them when they should.
One hundred evidence bags were enough for Lu Chuan to work all night.
Fortunately, the current site survey office is fully staffed. Lu Chuan is sorting out the physical evidence, and Yang Sen has begun to preprocess the materials collected by Lu Chuan and prepare to use instruments for experiments.
Lao Bai is not idle either. After Lu Chuan has processed the physical evidence, he will continue to number it, process the corresponding document information, and establish the case physical evidence. This is the cumbersome part of the murder case. Every detail must be completed according to the most stringent standards and procedures without missing a step.
Even if it is an insignificant screw, as long as it appears at the scene of a murder, it must be taken back and chewed several times before being put away until the case is solved.
Of course, not all murder cases can be solved. If they become backlogged, they will be dug up again and chewed over again every one or two years until the case is solved.
If the case is not solved...just do it again.
The cycle repeats, lingering and pathos, life and death depend on each other, never ending.
11:16 p.m.
"Brother Yang, please go back first. There aren't many things left, so I'll just keep an eye on them."
Yang Sen's family has a son who is about to take the college entrance examination. Lao Bai is getting older and stays up late. In this matter, Lu Chuan showed his due responsibility.
Yang Sen looked at the time, straightened up, took a breath, and took out two soft Chinese sticks on the table, one for himself and one for Lao Bai.
He did not give it to Lu Chuan because he had observed it many times. What Lu Chuan meant by smoking was to hold it in his hand after lighting it.
Occasionally take a few puffs and pass it through your mouth.
As an old smoker, Yang Sen can tell whether the breath has been inhaled into the lungs by smelling it, without looking at whether the color of the smoke is light blue or light gray.
Lao Bai took the cigarette: "Can you do it alone?"
"No problem, that's all. It will be done in another hour or two."
>After chatting for a while, Yang Sen and Lao Bai withdrew first.
Liu Guodong was still in the conference room on the first floor and had not returned. Lu Chuan sighed, knowing that the case was not progressing smoothly.
One day passed, and the identity of the deceased was still not determined.
The fingerprint comparison has no results, the DNA information comparison has no results, and the missing persons comparison has no results yet.
Shortly after the two left, Liu Guodong entered the laboratory with a tired look on his face.
“Lao Bai and the others are back?”
Lu Chuan nodded and handed Liu Guodong tea: "I just left for a while, and there are not many things left. It will be done in more than an hour, and the results will be available early tomorrow morning."
Liu Guodong nodded. Head: "You can come back later. I'll keep an eye on you."
"Master, it's better for you to come back. I'll be fine if I go home. I'll sleep in the office today."
>Liu Guodong shook his head: "I won't go back. My wife and children are asleep at this point. I will wake them up again when I go back."
The two chatted for a while, and Lu Chuan's work was completed. .
One hundred and twenty-six pieces of physical evidence were collected for fingerprints and DNA testing.
The rest is comparison and analysis.
But it is definitely too late tonight, both tasks need to be advanced tomorrow.
Liu Guodong slept on the sofa, and Lu Chuan moved the camp bed.
In fact, the criminal investigation detachment has dormitories, but they are basically allocated to singles. There are only two or three for emergencies, and there is not enough room for the leaders to sleep.
Bang bang bang!
Lu Chuan and Liu Guodong were awakened by the sound of banging on the door.
The one who broke down the door was Zhang Hui.
"Brother Hui, what's wrong?"
The sleepy-eyed Lu Chuan looked at the time, and it was less than 6:30 in the morning.
The two went to bed at around two o'clock last night and only rested for more than four hours. Liu Guodong was older and could no longer stay up late, and his eyes were bloodshot.
Zhang Hui's face was extremely ugly when he opened the door: "Something happened again!"
(End of this chapter)