Detachment Commander's Office.

"Yes, yes, Song Bureau, people have been caught, and everything is still there...... Yes, yes, send the lost item right away. ”

The leaders of several action groups stood outside Qin Yong's office and looked at each other.

"I was just about to go out and someone was caught?"

"The person is already in the detention room, Wang Tao and they are interrogating."

"I've been handling the case for many years, and it's really the first time I've encountered it, and the case has just been reported over there, and the case has been closed here."

"What is this, I just heard Lao Liu say that the leader of the three people arrested by Xiao Lu this time is the habitual thief who stole the old man's house of the Song Bureau the year before last......"

There are about 200 people in the internal and external service of the Haizhou City Criminal Investigation Detachment, and there are many people, and there are only a few people who are in charge.

The bosses of several departments all participated in the work of the front foot and the back foot back then.

is either a classmate or a soldier at the same time, so naturally there is no secret.

Qin Yong reported to Song Jiangguo in the office, and the story of solving the case spread outside.

"Xiao Lu's luck, it's really no one."

"Luck?"

"I can't see it, if they hadn't done a footprint analysis this afternoon, or they had arrested people, they might not have been able to try the case he did the year before last."

Lu Chuan is a celebrity in the criminal investigation detachment.

In just one day, four cases were solved!

The key clue of Zhang Wen's murder case was discovered by Lu Chuan, and then the backlog of robbery and injury cases was solved through footprint analysis in the morning.

As a result, a day didn't pass, and on the way to work, I caught a thief who was named to be caught.

Even with it, he also solved the backlog of theft of the director's father-in-law's house.

"Team Qin's ten-year Cruiser can probably be replaced......"

"Ding!"

"Advanced mission completed: The host analyzes the physical characteristics of the suspect according to the footprints of the theft case, completes the internal investigation and wants, and single-handedly arrests the suspect."

"System Reward: Intermediate Fingerprint Capture Skill Card."

"Does the host claim the reward?"

"Pick!"

Wow!

Streamers flickered in Lu Chuan's mind, and the knowledge and experience of fingerprint extraction were deeply rooted in Lu Chuan's mind.

After accepting the reward of the system, Lu Chuan let out a long breath.

Finally came a fingerprint-related skill, although it was just a fingerprint extraction skill card, not the fingerprint comparison analysis that Lu Chuan wanted the most, but it was not bad.

And this is the only intermediate skill card that Lu Chuan gets.

Compared with footprint analysis, fingerprint analysis is much more widely used in case detection.

Although fingerprints can't be like footprints, they can identify the physical characteristics of the suspect such as height and weight, but they have more advantages in locking the suspect.

Just like a human face, the comparison of its uniqueness 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.

The collection of fingerprints is a basic skill for any criminal policeman.

Lu Chuan studied it when he was at the Public Security University.

But it's not that you've learned, everyone's level is the same.

For example, Wu Dalang and Ximen Qing have the same types of parts, but the technology is different, the techniques are also different, and the feelings brought are naturally different.

The external embodiment is that a big lang drinks medicine, and an official I take medicine.

The same is true for fingerprinting, everyone uses the same tools, and the focus is on technique, experience and meticulousness.

The same fingerprint, collected by an ordinary police station police officer, may not be successful in comparison, or even if the comparison is successful, it will take more energy.

However, the same fingerprint collected by a senior field survey may have better integrity, and the success rate of comparison is higher.

The fingerprint collection skill card awarded to Lu Chuan by the system contains all aspects of fingerprint collection.

Especially for fingerprint collection in some special environments, there are many skills and methods, which Lu Chuan has never heard of before.

The formation of fingerprints is related to the physiological structure of the 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.

As for the structure of fingerprints, they are papillae and lines, and they are divided into bucket type, bow type and kei type according to the shape, and there are some special groups of people who have specific fingerprints.

The composition of a fingerprint is actually a chemical substance.

Unlike dogs, where sweat glands are only found on the tongue, the surface of the human body is covered with sweat glands.

The same is true on the fingers, where the sweat glands are more developed and smaller than elsewhere.

In addition to sweat glands, there are many sebaceous glands, and the substances secreted by these glands are the constituent substances left by fingerprints.

In layman's terms, the finger is like a seal, the gland secretion is the ink, and the place where the finger touches is equivalent to a seal, and it is a unique seal.

Fingerprints are actually taken to keep these chemicals that are usually invisible to the naked eye in place, and then take pictures with a camera.

Of course, in the past, when there were no cameras, it was necessary to use other special methods to save fingerprints, such as rubbing.

The fingerprint collection method rewarded by the system includes what Lu Chuan has learned.

Powder, magnetic and laser methods are suitable for fingerprinting on non-absorbent surfaces.

On paper, leather, wood and other absorbent materials, chemical methods such as iodine fumigation and fluorescent reagents are used.

In addition to this, there are some special cases of fingerprinting.

For fingerprint collection in the case of fire, blisters, and long-term sun exposure, there are many special methods in the intermediate fingerprint collection skill card.

These methods are the real essence, allowing Lu Chuan to collect fingerprints that others can't collect.

After accepting the reward, Lu Chuan is confident that he can at least sit in the first place in the Haizhou Criminal Investigation Detachment.

As for the whole province, he has never seen a master collect fingerprints, so it is difficult to judge.

But in the Haizhou City Criminal Investigation Detachment, Liu Guodong is an expert in this area.

Compared with the strength of Liu Guodong to collect fingerprints at the scene of Zhang Wen's murder, the intermediate fingerprint collection skills received by Lu Chuan are much higher.

Qin Yong was reporting the good news, and Lu Chuan was fine.

After leaving the infirmary, he went straight home.

But because of an arm injury, I definitely can't ride a shared bicycle.

Fortunately, it was a work injury, and Qin Yong had already arranged for the detachment's vehicle to pick him up.

Well, the car used is his car, Ten Years Cruiser.

Chenguang Villa Area.

In the evening, there are many old people walking in the district, greeting each other and chatting.

Then, I watched a Cruiser with a white license plate drive directly into the villa area and head towards the depths of the community.

"Who's in trouble, why are all the police cars coming?"

"I think...... Why does the co-pilot sit like a Sichuan baby? ”

"Isn't Chuan Wazi working in the Public Security Bureau?"