The last method of fingerprint identification is called a complete match.

It involves selecting at least thirteen or more feature points on the target fingerprint and then matching them completely with the fingerprints in the database.

Only when all selected feature points are successfully matched does it signify successful fingerprint identification.

The system will give a special beep to indicate a successful match.

This method of fingerprint analysis is not commonly used by most people.

Unless the fingerprint matching is very straightforward, meaning the collected fingerprint is very clear, without any distortion, and can be compared visually with the imprinted fingerprint.

Another scenario is when someone highly skilled is very confident in their fingerprint preprocessing, with very clear feature point marking and calculation.

Which type is Lu Chuan?

The comparison of feature points is not a simple image processing task where it just needs to look similar.

When marking each feature point, the angle, length, and position on the horizontal axis must be calculated based on the different points.

Only then can the system use this data for comparison.

Liu Guodong was also taken aback.

They had just been mainly observing Lu Chuan's preprocessing of the fingerprints and hadn't noticed that he clicked on complete match for fingerprint comparison.

The difficulty of this method is significantly higher than the idiot mode and probabilistic analysis mode.

Could the Crime Scene Investigation Team of Haizhou's Criminal Investigation Team be making a comeback?

Lu Chuan's attention was on the biographical information of the successfully matched individual.

"It's a mover from the exhibition hall," Lu Chuan said excitedly as he looked at Liu Guodong: "Master, give me a little more time."

"I can complete the comparison of these fingerprints in about half a day, and it will give the action group a direction in their investigation."

Why is fingerprint analysis so important in solving cases?

Not only does it provide clues when there are none, but it also helps identify suspects when there are already potential suspects.

It also provides the investigation team with the confidence needed for further investigation.

Especially during questioning and interrogation, having this evidence makes it much easier to determine if the other party is lying.

It's like the courtesans of ancient times, everyone wanted them, but it depended on how much silver they had.

When they had enough silver, then they could talk about romance and poetry.

At 4:28 p.m.

A stack of fingerprint analysis reports was delivered to Qin Yong's office.

"Captain Qin," Liu Guodong said, exceptionally excited, this crime scene investigation was about to shine: "The fingerprints on the frame, the oil painting, and the skin have all been identified!"

Lu Chuan had collected a total of seventy-nine fingerprints, seventy-eight of which had been successfully matched.

This provided an excellent direction for the subsequent investigation work.

"Good, good, good!"

Qin Yong slapped his thigh.

What he held in his hand seemed not like a few reports, but a mountain of gold and silver.

"This crime scene investigation was well done!"

"It's all thanks to Lu Chuan, who has been busy with fingerprint collection and analysis from yesterday until now, almost forty-eight hours without sleep."

Liu Guodong felt emotional; in criminal investigation, the most commendable quality is that perseverance to push through.

When faced with a task, dare to fight and charge ahead.

Having skills while also having a spirit of dedication.

This round-the-clock crime scene and trace inspection work was partly due to Liu Guodong's own lack of strength, and partly because he wanted to test Lu Chuan.

The result was clearly very satisfying.

From now on, Lu Chuan was fully capable of handling things independently.

Many tasks, Liu Guodong could now confidently delegate to him.

Qin Yong nodded in appreciation. Although he hadn't gotten much sleep in the past two days and nights either.

"I'll give you a two-day vacation for the crime scene investigation team, haha!"

After speaking, Qin Yong walked out of the office with the reports: "Task force, all responsible personnel, meeting in Conference Room 1 in ten minutes!"

This meeting ended quickly.

The main agenda was to allocate investigative work based on Lu Chuan's fingerprint analysis results.

Theoretically, every fingerprint owner that appeared on the painting might be the perpetrator.

Of course, the likelihood of the fingerprint owner on the frame being the perpetrator was smaller.

The fingerprint owner on the canvas might be a visitor.

After all, the painting wasn't protected, and anyone could touch it.

The prime suspects were actually the three fingerprint owners Lu Chuan extracted from the skin.

The skin sealed with resin forming the painting, who else could have touched the skin except the killer?

"Immediately arrest Liang Song!"

Indeed, one of the fingerprint owners on the skin was the grassroots artist Liang Song.

One hour later.

"Whom did you say?"

"The deceased... is Zhang Zixuan?"

Liang Song's expression was filled with horror.

Ren Qiang and Zhang Hui exchanged a glance, Zhang Hui spoke: "Liang Song, tell us, how did you kill Zhang Zixuan, why did you kill her, and where was the initial crime scene?"

"Are you suspecting me of killing her?"

Liang Song struggled and twisted, the cuffs on his wrists clattering.

"I didn't kill her!"

"I really didn't kill her!"

"How could I kill Zixuan... sob sob sob"

Faced with the news of Zhang Zixuan's death, Liang Song became extremely agitated, his face showing easily detectable sorrow.

After the hysteria, he even started crying.

After a long while, Liang Song's emotions finally stabilized.

"Do you smoke?"

Liang Song nodded numbly, and Zhang Hui stood up to light a cigarette for him.

The strong smell of tobacco made Liang Song's expression relax a bit.

"I really didn't kill her; I couldn't possibly kill her. I loved her so much, how could I kill her?"

"Liang Song, Zhang Zixuan has been murdered, her skin hidden in an oil painting, which was found in your studio."

"Moreover," Ren Qiang took out a report: "This is a fingerprint identification analysis report; we found your fingerprints on that piece of skin."

"How do you explain these...?"

In the interrogation room, Liang Song's mind teetered on the verge of collapse.

"I... I don't know... But I really didn't kill her."

Liang Song seemed to have lost the ability to answer questions normally.

Ren Qiang exhaled, which was precisely the situation he needed.

Liang Song wouldn't lie under these circumstances.

"Then start by telling us how you and Zhang Zixuan met, when you last saw her, and where."

"Zixuan... we met a year ago..."

As Liang Song recalled, the relationship between the two gradually became clearer.

Zhang Zixuan, after graduating from college, began working at Haizhou Vocational Technical College.

She enjoyed painting in her spare time, and through a chance encounter, met Liang Song.

A year ago, she began learning to paint at Liang Song's studio.

"Zixuan came to my studio every Wednesday; since it was a weekday, there weren't many students, and most of the time, it was just the two of us."

Although Liang Song was a grassroots artist who hadn't undergone formal artistic training,

he had a great talent, exuding a bit of an artist's aura.

Unlike most unkempt artists, Liang Song's shoulder-length gray hair was neatly groomed.

His deep gaze was incredibly focused when he was painting.

He was a charming, artistic, talented, and financially successful man.

"We fell in love, truly; we were in love."

Liang Song's expression relaxed as he reminisced: "But... our relationship was discovered by Zixuan's boyfriend..."

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