Chapter 24: Collecting fingerprints from the corpse
An hour later, a professional salvage team arrived at the scene.
For water salvage, the criminal investigation detachment has a dedicated cooperation team.
From the experience of criminal investigation and handling of cases, the proportion of underwater cases is not high, but it is not low either.
Especially among homicide cases, the proportion of corpses dumped in water can reach 30%.
In addition to murder cases, items involved in many other cases, especially murder weapons, are often thrown into the water.
Therefore, the criminal investigation detachment often has the need to salvage from the water.
Wu Jingzhong used to be a professional swimmer. After retiring, he established a salvage company.
It is the salvage team that the Criminal Investigation Detachment has been cooperating with.
"Old Wu, the situation down there is not clear. It may be a corpse or something else. Be careful when salvaging and try not to damage it."
Wu Jingzhong, who was in his forties and had a rough appearance, patted his chest with Ren Qiang and said, "Don't worry, I will go and salvage it myself this time."
The body has been taken away, so we must seize the time for an autopsy.
Lu Chuan also followed back.
Because no identification documents were found on the body.
Lu Chuan wants to go back and collect the fingerprints and DNA samples of the corpse to see if he can compare the identity of the deceased in the system.
Compared with collecting fingerprints at a fire scene, collecting fingerprints on corpses is simpler.
Of course, this so-called simplicity depends on the degree of decay of the corpse.
According to forensic estimates, the body sunk in the water died about three days ago.
And due to being soaked in water, the body's degree of decay was not high, but the edema was severe.
But for fingerprint collection, the impact is not small.
The most difficult thing to collect fingerprints from corpses is corpses with a high degree of decay. They ooze corpse water when touched, and the whole corpse looks like a big jelly, which is difficult to do.
Anatomy room.
The corpse was lying flat on the autopsy table, and the two forensic doctors were ready to operate.
“Ding!”
“Basic task: complete the fingerprint extraction of the soaked corpse and complete the identification of the deceased.”
After receiving the task, Lu Chuan was also ready to print his fingerprints.
Judging from the shape of the corpse, the figure is well-proportioned, the legs are slender, and the skin is fair.
Although the face has been eaten by fish and the original appearance cannot be seen clearly, the face shape of the oval face can still be distinguished.
Long hair reaching waist, she should be less than 30 years old, and she should have been a very beautiful woman before her death
Lu Chuan did not directly use mimeograph to rub fingerprints, the body will be swollen after soaking .
If left untreated, the gaps between the imprinted fingerprint patterns will become enlarged.
It is like enlarging the entire fingerprint by a certain factor, which will cause considerable difficulties in later comparison.
Opening the discovery box, Lu Chuan began to process the corpse's fingers.
But before that, Lu Chuan needed to communicate with the forensic doctor.
After all, the current investigation only has the responsibility and right to investigate the corpse surface. If you want to directly touch the corpse, you must obtain the consent of the forensic doctor.
"Forensic Doctor Wang, the corpse has been soaked and the fingers are swollen. I need to do some treatment on the fingers, but it will not affect the completion of the autopsy. You see..."
Wang Changjiang is a senior forensic doctor of the Criminal Investigation Detachment. In terms of strength, The technical level is equivalent to that of Liu Guodong.
However, in terms of status, he is not as high as Liu Guodong.
The action team and criminal police squadron generally cannot find forensic doctors.
In the entire criminal investigation detachment, forensic medicine can be said to be one of the most idle positions.
I can compete with the lady who delivers newspapers at the newsstand at the door.
"It's okay," Wang Changjiang waved his hand: "There are no other injuries on the surface of the body. The cause of death should be mechanical asphyxia."
"Xiao Shen, help Xiao Lu, take pictures of the body first. Fix the shape of the corpse before dissection, and then collect fingerprints."
"Okay, teacher."
The voice is sweet and crisp, and the other person's smile is very attractive.
One of the police beauties of the Criminal Investigation Detachment, Shen Yan. Lu Chuan's senior sister joined the police two years ago.
The two knew each other when they were in school. After all, a well-known school beauty and a well-known school idol must have crossed paths.
"Excuse me, senior sister. Please treat me to dinner another day."
"Okay, I will wait for you someday."
Shen Yan smiled sweetly, bringing a bit of vitality to the gloomy autopsy room.
"Just tomorrow, our two majors will probably not be too busy tomorrow."
The condition of the corpse is simple, the anatomy can be completed today, and the current inspection work is almost done today. .
It’s time for dinner tomorrow.
Shen Yan’s photoshoot ended quickly, and Lu Chuan came on stage next.
Opening the discovery box, Lu Chuan took out a five-centimeter-long steel needle.
Then he prepared a paper cup and slowly inserted the steel needle into the corpse's fingernails.
The depth is shallow, only about one centimeter.
Shen Yan and Wang Changjiang had seen Liu Guodong collect fingerprints from corpses before, but they just washed the fingers and then directly rubbed them.
It’s not as complicated as Lu Chuan.
"Lu Chuan, what are you..."
Wang Changjiang was at ease. Although he was curious, he did not speak. The sensible Shen Yan asked with wide eyes.
“This steel needle is hollow, which can remove body fluids from the nails to a certain extent, eliminate swelling, and make the collected fingerprints easier to compare.”
While speaking, the tail of the steel needle Light yellow liquid has been dripping out, and the fingertips are gradually shriveled.
Shen Yan looked at Lu Chuan's operation with a surprised look on her face, occasionally tutting her tongue in praise.
Lu Chuan was also in a happy mood, just like a peacock spreading its tail.
Collecting fingerprints is the feather screen.
Lu Chuan completed the operation quickly, and then intercepted the hair and nails to use as DNA testing materials.
Next, Shen Yan and Wang Changjiang were busy dissecting and issuing an autopsy report.
Lu Chuan returned to the laboratory and first extracted DNA information through the instrument.
The extraction of DNA information is not like what ordinary people imagine. The test materials are directly sent into a certain instrument, and then the DNA information can be obtained.
All DNA test materials must be pre-processed before information can be extracted.
The professional term for trace inspection is purification.
In the past, the criminal investigation detachment used many methods to extract DNA.
It can be mainly divided into two categories, liquid extraction and solid extraction.
But ten years ago, the authorities invented a reagent for extracting and purifying DNA, which unified the methods of extracting DNA in criminal investigations.
It also greatly reduces the difficulty of DNA information extraction.
Lu Chuan studied it when he was in college, and he has watched Liu Guodong and others operating instruments for more than a month.
Although some difficult and complicated diseases cannot be solved, general DNA extraction is still no problem.
After processing the inspection materials, Lu Chuan began to prepare for fingerprint comparison.
The fingerprint database of the Haizhou Municipal Public Security Bureau and the entire province are connected to the Internet.
This is also a project that the provincial government has vigorously promoted in the past few years.
With the advancement of science and technology and the improvement of resident information, more and more people are being fingerprinted.
In some police stations, there are even indicators in this regard, how many fingerprints must be collected in a year.
So many people who go to the police station to do business often encounter situations where fingerprints are collected first and then the business is done.
Although Lu Chuan did not have excellent fingerprint comparison and analysis capabilities, his fingerprint collection was very standard.
The system can perform comparisons on its own.
While Lu Chuan was busy, the salvage team at the Xingfu Reservoir site also made results.
(End of this chapter)