A tiny fingerprint can reveal a plethora of information.

Besides age, a fingerprint can also determine if someone smokes, has taken medication or consumed alcohol recently, and even what cosmetics they use.

This is because a fingerprint is composed of substances formed by sweat and oils secreted from the sweat and sebaceous glands on the fingers.

These components are 98% water, plus various trace elements such as amino acids, iron, magnesium, zinc, and urea.

It is precisely these minute components that can expose relevant information about different individuals.

People with different lifestyles have subtle differences in the chemical substances in their sweat and oils.

For example, people with a strong taste for salty foods will have a higher sodium ion content in the residue of their fingerprints.

Of course, because fingerprints are inherently small, the amount of residual material is measured in milligrams or micrograms.

Ordinary instruments are not sufficient for analyzing the residue of fingerprints.

This involves another skill: trace evidence analysis.

In reality, any object that comes into contact with another will cause changes in trace substances.

The changed trace substances can indicate whether a certain fact has occurred or link the objects that came into contact.

By identifying trace evidence, its origin can be determined, the crime process revealed, and the characteristics of the criminal, providing evidence for investigation and solving cases.

Lu Chuan may not have these skills, but advanced fingerprint analysis includes some knowledge in this area.

In Lu Chuan's view, advanced skills are not separate skills, but a collection of multiple skills.

For instance, in the realm of image processing technology, advanced fingerprint analysis involves more diverse methods of preprocessing fingerprints.

This involves the application of drawing software for processing fingerprints.

This involves a series of image processing skills such as image transformation, decoding compression, enhancement, and restoration.

Although the system's rewarded skill is advanced fingerprint analysis, once mastered, Lu Chuan could independently use other abilities involved in it.

The morning of November 21.

The winter sun is like a girl's gentle hand, caressing the body without being scorching yet sensible.

The case of Song Kun's murder has reportedly been handed over to the provincial department.

Experts have been dispatched from above to reorganize the special task force, drawing elite personnel from various departments such as economic investigation, criminal investigation, and the technical appraisal center.

Even, Lu Chuan heard from Old Bai that the task force invited experts from the provincial hospital as consultants.

The flamingo-lily, which hadn't been tended for several days, appeared slightly dull in color.

Lu Chuan was carefully pruning, fertilizing, and watering it, moving it to the windowsill to bask in the warm sunlight.

Old Bai hummed an opera segment that Lu Chuan had never heard before, carrying an enamel jar.

Yang Sen, as usual, was handling beads, the twenty-eight RMB small-leafed padauk gradually starting to resemble small-leafed padauk.

The crime scene investigation's bristle brush had done a remarkable job.

However, the brush showed significant wear; the bristles that were once dense and firm had now become somewhat curly, with bald spots in the middle.

"Old Yang, this brush is public property. If it's broken, you'll have to compensate for it."

The bristle brush might never have expected that aside from closely encountering bones, it would serve such a purpose in its life.

The brush, despite its condition, does this service, so much so for humans.

Therefore, never underestimate your own abilities.

Just like the value created in moving Dongguan-style services from mattresses to live broadcasts is much higher.

More people can appreciate beauty, and having the right to experience artistic influence is something every man deserves.

Ring ring ring!

In the crime scene investigation office, there was only one landline phone, located on Liu Guodong's desk.

When it rings, it means work has arrived.

Indeed, shortly after putting down the phone, Liu Guodong looked at Lu Chuan: "Lu, come with me to Captain Qin's office."

"Captain Qin is back?"

Qin Yong had gone to the municipal bureau to attend the task force's preparation meeting early in the morning, yet he'd returned so soon?

Putting down the flamingo-lily and stroking it gently, Lu Chuan donned his police uniform jacket and followed Liu Guodong out.

Speaking of which, recently, Qin Yong's visits to the crime scene investigation haven't been as frequent as before.

Most of the time, he would summon Lu Chuan to his office.

Last night, everyone had a good sleep.

One of Song Kun's murderers had been arrested, and though Wang Manli's boyfriend was currently not in Haizhou City, his specific location had come into view.

According to yesterday's plan, the arrest action will be implemented today.

"Lu, prepare yourself. You will follow me for a period of time as a member of the task force, participating in the follow-up investigations."

Lu Chuan was slightly stunned, not expecting that Qin Yong would call him over to discuss his participation in the task force.

Liu Guodong was overjoyed, as this was good news for Lu Chuan.

"Is there any issue on the crime scene investigation's side?"

"No, no, Captain Qin, rest assured, Lu will certainly collaborate well with the task force's work."

Qin Yong nodded, feeling comforted by Liu Guodong's assurance, as leadership often requires such subordinates.

He could discern when you're genuinely seeking opinions and when just following procedures.

"Come with me to the municipal bureau in the afternoon; experts from the provincial department will arrive then."

"Yes!"

"Ding!"

"Advanced Task: Join the provincial department's task force, assist Li Donglin from the provincial criminal investigation division, collect clues, and provide technical support for solving the cases."

Crime Scene Investigation Office.

"This is great news!"

Old Bai put down the enamel jar, excited about Lu Chuan's upcoming participation in the task force.

Yang Sen also put down the bristle brush, holding the small-leafed padauk in his hand: "It's a good opportunity to meet the provincial department's experts and add some credentials."

A task force depends on its level and the cases involved.

Generally, whenever there's a homicide case, a task force will be established specifically for it.

There's not much of a level, the criminal investigation team establishes a task force purely for solving the case.

Of course, establishing a task force doesn't guarantee the case will be solved.

So, a task force also means designating a police officer to focus on a specific case.

For unsolved cases, the team will assign one or two detectives to focus on that case specifically.

This is the essence of frontline criminal investigation work, focusing on solving past cases when there aren't any new ones.

Many detectives carry unresolved cases throughout their careers.

Over ten or twenty years, as long as they haven't retired, they always think about solving those cases.

Gradually, it becomes a mental burden.

Few frontline detectives retire without unresolved cases to their name.

Of course, some don't make it to retirement, like Song Kun.

Song Kun was one of the rare few without any unresolved cases during his lifetime, but he died in a common missing person's case on the verge of retirement.

Above the task force established by the criminal investigation team is the one formed by the municipal bureau.

Task forces at this level, whether for homicides, robberies, or other cases, have a greater impact.

Most of the time, there will also be collaboration between different police divisions.

However, task forces at this level typically have influence only at the municipal bureau level.

A provincial department task force is different.

The establishment of a provincial task force is not common, but any such task force signifies a significant case.

Ordinarily, without a suspect linked to two or three murders, there's no qualification for it.

The murder of Song Kun, as a detective, was not enough for this level.

However, the case behind Song Kun's murder demanded the provincial department's attention.

As Wang Manli initially confessed, four people had already disappeared at her hands.

Four people in three years.

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