The detachment leader's office.
"Yes, yes, Director Song, the person has been caught, and the things are all there... yes, the lost items will be sent over immediately."
Several leaders of the action team stood outside Qin Yong's office and looked at each other.
"I was just about to go out and I was caught?"
"The person is already in the detention room, and Wang Tao and the others are interrogating him."
"I have been working on cases for many years, and this is the first time I have encountered a case that was just reported there and then closed here."
"What's this? I just heard from Old Liu that the leader of the three people Xiao Lu arrested this time was the habitual thief who stole from Song Bureau's father-in-law's house the year before last..."
The Haizhou City Criminal Investigation Detachment has more than 200 people including both internal and external staff. It may be said that there are many people, but it may be said that there are only a few people in charge.
The bosses of several departments all joined the work at the beginning.
Either he was a classmate or he was a soldier who changed his career at the same time, so naturally there was no secret.
Qin Yong reported to Song Jiangguo in the office, and the story of solving the case spread outside.
"No one else is as lucky as Xiao Lu."
"luck?"
"I can't see. If they hadn't done a footprint analysis this afternoon, even if they caught him, they might not be able to find out the case he did the year before last."
Lu Chuan is considered a celebrity in the criminal investigation detachment.
In just one day, four cases were solved!
The key clue to Zhang Wen's murder case was discovered by Lu Chuan. Then in the morning, he solved the backlog of robbery and injury cases through footprint analysis.
As a result, before the day passed, I caught a thief named by the superiors on my way to get off work.
At the same time, he also solved the long-standing case of the director's father-in-law's house being stolen.
"Team Qin's ten-year-old Cruiser can probably be replaced..."
"Ding!"
"Advanced mission completed: The host analyzed the physical characteristics of the suspect based on the footprints of the theft, completed the internal co-investigation, and single-handedly arrested the suspect."
"System reward: Intermediate fingerprint collection skill card."
"Does the host receive the reward?"
"receive!"
Wow!
Streams of light flashed in Lu Chuan's mind, and the knowledge and experience about fingerprint extraction were deeply rooted in Lu Chuan's mind.
After accepting the reward from the system, Lu Chuan let out a long breath.
Finally, there is a skill related to fingerprints. Although it is just a fingerprint extraction skill card and not the fingerprint comparative analysis that Lu Chuan wants most, it is not bad.
And this is the only intermediate skill card that Lu Chuan got.
Compared with footprint analysis, fingerprint analysis is much more widely used in case detection.
Although fingerprints cannot identify the suspect's height, weight and other physical characteristics like footprints, they have more advantages in identifying suspects. .
Just like a human face, its uniqueness comparison is more reliable and convenient than that of footprints.
There are two prerequisites for fingerprint comparison, one is that the murderer leaves fingerprints, and the other is that fingerprints are collected.
Fingerprint collection is a basic skill for any criminal police officer.
Lu Chuan learned it when he was at the Public Security University.
But it doesn’t mean that everyone has the same level after learning.
Just like Wu Dalang and Ximen Qing, the types of parts are the same, but the techniques and techniques are different, so the feelings they bring are naturally different.
The external manifestation is that a Dalang drinks medicine, and an official takes medicine.
The same is true for collecting fingerprints. Everyone uses the same tools. The key is technique, experience and meticulousness.
For the same fingerprint, if an ordinary police station policeman collects it, the comparison may not be successful, or even if the comparison is successful, it will consume more energy.
However, the same fingerprint collected by a senior on-site survey may have better integrity and a higher success rate of comparison.
The fingerprint collection skill card awarded to Lu Chuan by the system covers all aspects of fingerprint collection.
Especially for fingerprint collection in some special environments, there are many techniques and methods that Lu Chuan has never heard of before.
The formation of fingerprints is related to the physiological structure of fingers.
Judicially speaking, fingerprints include finger belly lines, knuckle lines and palm lines.
But in real life, even in solving crimes, fingerprints mostly refer to the lines on the belly of the finger.
As for the structure of fingerprints, they are papillae and lines. According to the shape, they are divided into bucket type, bow type and skip type. There are also some special groups with specific fingerprints.
The composition of fingerprints is actually a chemical substance.
Unlike dogs whose sweat glands are only on the tongue, the surface of the human body is covered with sweat glands.
The same is true on the fingers, and compared with other places, the sweat glands on the fingers are more developed and smaller.
In addition to sweat glands, there are also many sebaceous glands. The substances secreted by these glands are the constituent substances left by fingerprints.
In layman's terms, fingers are like seals, and gland secretions are ink. The place where the fingers touch is equivalent to a seal, and it is a unique seal.
The purpose of collecting fingerprints is actually to make these chemical substances that are usually invisible to the naked eye appear, and then take pictures of them with a camera.
Of course, when there were no cameras in the past, other special methods were needed to preserve fingerprints, such as rubbings.
The fingerprint collection methods rewarded by the system include those that Lu Chuan has learned.
Powder method, magnetic particle method and laser method are suitable for extracting fingerprints on the surface of non-absorbent materials.
On paper, leather, wood and other water-absorbent materials, chemical methods such as iodine fumigation and fluorescent reagents are used.
In addition, there are some fingerprint collections under special circumstances.
There are many special methods in the intermediate fingerprint collection skill card for fingerprint collection under conditions such as fire, blisters, and long-term sun exposure.
These methods are the real essence, allowing Lu Chuan to collect fingerprints that others cannot.
After accepting the reward, Lu Chuan was confident that he could at least secure the top spot in the Haizhou Criminal Investigation Detachment regarding fingerprint collection.
As for the whole province, he has never seen an expert collect fingerprints, so it is difficult to judge.
But in Haizhou City Criminal Investigation Detachment, Liu Guodong is an expert in this field.
Compared with Liu Guodong's ability to collect fingerprints at the scene of Zhang Wen's murder case, the intermediate fingerprint collection skills received by Lu Chuan were much higher.
Qin Yong was announcing the good news, and Lu Chuan was fine.
After leaving the infirmary, he went straight home.
But because of my arm injury, I definitely won’t be able to ride the shared bicycle.
Fortunately, it was a work-related injury, and Qin Yong had already arranged for the detachment's vehicle to pick him up.
Well, the car used was his car, a ten-year-old Cruiser.
Morning villa area.
In the evening, there were many elderly people walking in the area, greeting each other and chatting.
Then, I watched a Cruiser with a white license plate drive directly into the villa area and run deep into the community.
"Who committed a crime? Why did the police cars come?"
"Let me see...why does the person sitting in the passenger seat look like Chuan Wazi?"
"Isn't Chuan Wazi working in the Public Security Bureau?"
