Director's Office.
"Yes, yes, Director Song, we've caught them and retrieved the items... Yes, we'll send the lost goods over right away."
The leaders of several action teams stood outside Qin Yong's office, exchanging confused glances.
"I was just about to go out, and they've already caught them?"
"They're already in the holding cell; Wang Tao is interrogating them."
"I've been doing this for years, and it's the first time I've encountered a case where we were reported, and then closed it immediately."
"What's this? I just heard Old Liu say that among the three people Lu caught this time, the leader was the infamous thief who stole from Director Song's father-in-law's house the year before last..."
Haizhou City's Criminal Investigation Team consists of more than 200 people, including both internal and external staff. Though it seems many, the real decision-makers are just a few.
The bosses of several departments began work around the same time.
They were either classmates or soldiers who transitioned at the same time, so naturally, there were no secrets between them.
Qin Yong is reporting to Song Jiangguo in the office, and the process of solving the case quickly spreads outside.
"Lu's luck, it's truly unmatched."
"Luck?"
"I don't think so. If it weren't for their footprint analysis this afternoon, even if they caught them, they might not have been able to unravel the case from years ago."
Lu Chuan is quite the celebrity in the Criminal Investigation Team.
Just in one day, he solved four cases!
The key clue to Zhang Wen's homicide was discovered by Lu Chuan, and then in the morning, he solved a longstanding robbery and assault case through footprint analysis.
Less than a day passed, and on his way home from work, he caught a thief that the top brass had specifically named, which also solved the longstanding theft case of the director's father-in-law's house.
"Captain Qin's ten-year-old Land Cruiser could likely be replaced now..."
"Ding!"
"Advance task completed: The host analyzed the suspect's physical characteristics from the theft footprints and completed the internal investigation and pursuit, capturing the suspect single-handedly."
"System reward: Intermediate Fingerprint Collection Skills card."
"Does the host wish to receive the reward?"
"Receive!"
Swoosh!
Streams of light flashed in Lu Chuan's mind, with knowledge and experience of fingerprint extraction deeply rooted in his mind.
After receiving the system's reward, Lu Chuan exhaled deeply.
Finally, a skill related to fingerprints has arrived, though it's just a fingerprint extraction skill card and not the fingerprint comparison analysis that Lu Chuan most wanted, it's still pretty good.
Moreover, this is the only intermediate skill card Lu Chuan has received.
Compared to footprint analysis, the application of fingerprint analysis in case-solving is much broader.
While fingerprints can't determine the suspect's height, weight, and physical characteristics like footprints can, they have an advantage in suspect identification.
Much like a face, the unique comparison of fingerprints is more reliable and convenient than footprints.
There are two prerequisites for fingerprint comparison: one is that the perpetrator leaves a fingerprint, and the other is to collect the fingerprint.
Fingerprint collection is a basic skill for any detective.
Lu Chuan learned it at Public Security University.
But just because everyone learned it doesn't mean their skill levels are the same.
Like Wu Dalang and Ximen Qing, while they may have the same parts, their techniques vary, and so does the experience, leading to different outcomes.
The outward manifestation is one person is down, another is up.
Fingerprint collection is the same; everyone uses the same tools, but the focus is on technique, experience, and meticulousness.
For the same fingerprint, a regular police officer might not successfully compare it, or even if they do, it might take more effort.
However, a seasoned crime scene investigator's collection of the same fingerprint might have better completeness and a higher success rate in comparison.
The system's fingerprint collection skills card awarded to Lu Chuan covers all aspects of fingerprint collection.
Especially in some special environments, there are many techniques and methods that Lu Chuan had never heard of before.
The formation of fingerprints is related to the physiological structure of fingers.
In terms of jurisprudence, fingerprints include finger pulp ridge, knuckle ridge, and palm ridge.
But in actual life, and even in solving cases, fingerprints often refer to the ridges on the finger pulp.
As for fingerprint structures, it's the papillary and ridge lines divided by shape into loop, arch, and whorl types, with some special groups having peculiar fingerprints.
And the composition of fingerprints is actually a chemical substance.
Unlike dogs whose sweat glands are only on their tongues, the human body surface is filled with sweat glands.
Fingers are the same; compared to other areas, the sweat glands on fingers are more developed and finer.
Besides sweat glands, there are many sebaceous glands, and the substances these glands secrete make up the fingerprint residue.
Simply put, a finger is like a stamp, gland secretions are like ink, and wherever the finger touches is like a stamp, but a unique stamp.
Collecting fingerprints is essentially about making these normally invisible chemical substances visible to the naked eye and then photographing them.
Of course, before photography existed, special methods were needed to preserve fingerprints, such as etching.
The system's awarded fingerprint collection methods encompass those Lu Chuan learned.
Powder method, magnetic powder method, and laser method, suitable for extracting fingerprints from non-absorbent surfaces.
On surfaces like paper, leather, and wood, which are absorbent, chemical methods like iodine fumes and fluorescent reagents are used.
Additionally, there are fingerprint collection methods for special conditions.
In cases like burning, soaking, prolonged sun exposure, the intermediate fingerprint collection skills card contains many special methods.
These methods are the true essence that lets Lu Chuan collect fingerprints others couldn't.
After receiving the reward, regarding fingerprint collection, Lu Chuan is confident in his ability to be the top in Haizhou City's Criminal Investigation Team.
As for the province-wide scope, he hasn't seen masters collect fingerprints, making it hard to judge.
But in Haizhou City's Criminal Investigation Team, Liu Guodong is the expert in this field.
Comparing the competence in fingerprint collection at the scene of Zhang Wen's case, Lu Chuan's intermediate fingerprint collection skills surpass Liu Guodong's by a large margin.
While Qin Yong is busy reporting the good news, Lu Chuan doesn't have much to do.
Leaving the medical room, he headed straight home.
But due to his arm injury, riding a shared bike was impossible.
Thankfully, it's a work injury, so Qin Yong has already arranged for the team vehicle to pick him up.
Yes, the vehicle used is his ride, a ten-year-old Land Cruiser.
Chenguang Villa District.
At dusk, many elderly people in the community are taking walks, greeting and chatting with each other.
And then, they saw a white-plated Land Cruiser drive straight into the villa district, heading deep into the community.
"Whose family got into trouble this time, that even police cars are coming?"
"I think... doesn't it look like it's Chuan the guy sitting in the passenger seat?"
"Isn't Chuan working at the Public Security Bureau?"