1995, Starting as a Criminal Investigation Expert

The second stop of the lecture was the New Taipei Precinct.

Compared to the large-scale operation at the Tingyang Precinct, the situation in New Taipei City was just as Li Shu had imagined: everyone gathered together for casual conversation, exchanging ideas and experiences.

The effect was very good.

Especially since the 9.5 case was originally a case handled by the New Taipei Precinct, they knew how difficult it was to handle.

They also understood the significance of the half fingerprint that Li Shu had matched.

Li Mingsheng looked Li Shu up and down, his eyes full of admiration. Suddenly, he turned his head and patted a young man behind him.

"Zhang Tao, it's not that I want to compare you guys, but the thing is you're the senior, so learn from him and keep it up. After we old guys retire, it'll be your world, young people's world."

The young man's name is Zhang Tao.

He also graduated from Ningjiang Police College.

Last year, the municipal bureau's technical squadron had not yet been upgraded and was short-staffed, so they simply sent the few students they had assigned to the branch bureaus below.

Zhang Tao opened his mouth, wanting to retort, saying that he had been in the team for a year and had made many contributions to the work, helping to solve several cases.

But the words stuck in his throat.

If we're talking about solving cases, Li Shu helped solve the 9.5 case, which was a major case.

When it comes to comparing work contributions, Li Shu's so-called "regional comparison method" makes it even more impossible for me to compete.

Li Shu quickly declined, saying that he still needed to learn from his senior brother.

Zhang Tao gave an awkward smile, thinking of Peng Rong.

If we're talking about pressure, Peng Rong, who is also a senior student, must be under even more pressure.

I came out of the New Taipei Precinct.

Peng Rong didn't come today; Li Shu came with Tan Guoxiong.

"Guoxiong, let's go to Tingyang."

Zhao Yong told him not to get involved in Tian Yu's case, but Li Shuzhen really wanted to give it a try.

What if it works?

Just think of Qiao Suqing, how tragic she was.

She may never be able to stand up again, but at least those who harmed her should be punished as they deserve.

Tan Guoxiong nodded hurriedly and quickly jumped into the sidecar.

The two rushed to the Tingyang branch and headed straight for the Criminal Investigation Brigade.

Tian Yu happened to be there.

Upon seeing Li Shu arrive, he immediately recalled what Guo Xiangyang had told him.

With a sigh, Tian Yu spoke first: "Li Shu, about that case I told you about yesterday, just leave it alone. I'll figure something out later. You're busy at the Municipal Bureau, too."

Li Shu was taken aback.

I haven't given up yet, so why is Tian Yu giving up first?

"Team Leader Tian, ​​I'd like to give this case a try. I've also spoken to Team Leader Han, and he supports me."

Zhao Yong was determined not to give up until he hit a wall, and when Li Shu said he wanted to give it a try, he didn't say anything.

As for Han Jianjun, Li Shu didn't say anything.

I can always study it after get off work, as long as it doesn't interfere with my regular work.

This is an old case, so there's no rush.

Tian Yu was stunned for a moment, then overjoyed: "That's wonderful!"

He definitely didn't want Li Shu to give up, and felt that Li Shu was a glimmer of hope.

Since Li Shu himself wants to give it a try, Guo Xiangyang must have nothing to say, right?

They immediately asked Li Shulai what he wanted to do and what kind of support he needed.

"I want to see the physical evidence and the case files, especially the crime scene investigation and all the photos of fingerprints. I want to take the negatives back to study them."

Li Shu has considered it.

The fingerprint preprocessing step can be skipped.

Then we'll stick to the old method: find a way to improve fingerprint matching.

The system has some methods and experience that can be used, especially the overlapping fingerprint.

Li Shu considered that he could use the method he had previously used to deduce the incomplete fingerprints to manually try to separate the fingerprints.

Furthermore, the system mentions a method that allows you to piece together incomplete fingerprints from a crime scene, like a jigsaw puzzle, to create a complete fingerprint.

The file given to the municipal bureau contained only seven photos, which had already been selected.

The number of fingerprints collected at the scene was certainly more than that, but they were all incomplete, so they were simply discarded.

What Li Shu needs to do now is to complete the puzzle.

It is possible that a single feature point exists on a fragmented fingerprint.

Then, by piecing together one here and one there, you can get several features that can be compared.

"no problem."

Tian Yu hurriedly got up and led the two to the archives.

When Li Shu needed the film, Guo Xiangyang arrived after hearing the news. Upon hearing that Li Shu wanted to retrieve the film, he knew that Li Shu was in trouble.

"Tian Yu, oh Tian Yu!"

Guo Xiangyang wanted to punch Tian Yu.

But what could he do now that things had come to this?

At this point, it would be too late to persuade Li Shu.

After much thought, the only hope is that Li Shu will learn to give up after his failure.

Li Shu took away a large number of on-site investigation photos.

After returning to the municipal bureau, I didn't rush to study it. I waited until I finished my work and went home before starting to study it.

At this point, the AFIS system is useless.

It's all done by hand.

Moreover, even horseshoe-shaped mirrors are not enough; microscopes are needed.

Li Shu still needs to try to find tertiary features in order to distinguish which ones are a fingerprint.

The whole process was like piecing together documents shredded by a paper shredder, one by one.

They stayed up until midnight, only completing the first step: initially classifying the fingerprints left at the scene to determine which finger they belonged to.

"Li Shu, this is too difficult."

Tan Guoxiong stretched his shoulders and couldn't help but sigh.

You won't know how difficult it is until you try it yourself.

Li Shu got up and stretched, still quite optimistic.

"Everything is difficult at the beginning, and it will only get harder from here on out."

Tan Guoxiong was taken aback, then laughed.

Li Shu also smiled.

Just give it a try. How will you know it won't work if you don't try?

That night, the two stayed up in the office until dawn.

When Zhao Yong arrived at work, he was startled to see the two people asleep on their desks.

Li Shu was startled awake and saw Zhao Yong holding a photo with his brows furrowed, which made him feel guilty.

"Alright."

Zhao Yong sighed, pointed to the inner room, and told the two of them to lie down for a while. Then he said, "Anyway, there's nothing much to do today. Tell us what to do later, and we'll do it together."

Li Shu was overjoyed; having someone to help would definitely make things faster.

"Brother Yong, you're not angry, are you?" Li Shu asked cautiously.

Zhao Yong snorted lightly, angry. But what could he possibly be angry about?

"Ultimately, it's all about solving the case."

He shook his head and urged the two of them to go and rest.

With the help of others, things did go faster, but only Li Shu had experience with this, and when it came to the puzzle-solving part, the help that others could provide was limited.

Li Shu had no choice but to do it himself.

The next day, Li Shu took the partially pieced-together fingerprint and compared it with the system.

This is an index finger fingerprint, with only 4 feature points pieced together.

Moreover, it lacks a core area.

Li Shu carefully studied the feedback results, but because there were too few feature points, he could not determine whether it was a match.

The only solution is to do what was done in the 9.5 case: hand over the results to Tian Yu and let him investigate from other angles to rule out other possibilities.

Tian Yu took it very seriously, and the first batch of results was quickly completed.

wrong.

The four characteristic points represent the best possible fingerprint that Li Shu has pieced together.

Li Shu had no choice but to pin his hopes on the overlapping fingerprints.

That night.

Li Shu was still working overtime as usual.

Tan Guoxiong couldn't offer help; his main role was to provide companionship.

Li Shu took the wallet, removed the plastic film clip, and observed it directly through a microscope.

After four years, the bloodstains had become old and even more blurred.

Li Shu could only use a microscope to look for the most subtle changes and try to deduce whether it was a line and what its direction was.

Then, this part is a purely hand-drawn reproduction.

This work has been going on for two days.

Before he knew it, it was already past four in the morning, and Li Shucai had finally managed to draw a preliminary thumbprint.

It is still incomplete, probably only about a quarter of the complete fingerprint.

Moreover, they are scattered, piece by piece.

In other words, the system must be able to perform partition comparisons; otherwise, it would be completely useless.

Seeing that Tan Guoxiong was already asleep, Li Shu didn't wake him and went to the computer room to compare the data himself.

The machine hummed as it continuously partitioned and adjusted, providing constant feedback on the results.

Li Shu recorded the first ten.

The probability of that happening is too small.

As Li Shu was taking notes, he suddenly noticed that one name appeared three times.

The rankings may differ, but they are all in the top ten.

With these repeated occurrences, Li Shu immediately perked up.

There's something wrong with that.

They quickly retrieved the person's information.

This is a young man named Cao Fangxu, who should be only 25 years old this year.

This criminal record dates back to when he was 17 years old. He was involved in a fight that resulted in minor injuries. Because he was under 18, he received a lenient sentence.

Ten fingerprints were collected, and Li Shu quickly found the fingerprints of the other fingers he had studied to compare them.

To my surprise, the features matched.

For example, the index finger fingerprint was pieced together with four feature points, and three of them matched.

The direction of the lines is almost identical.

This person is highly suspicious.

When I went outside, it was almost six o'clock, and the sky was already beginning to lighten.

Li Shu quickly woke up Tan Guoxiong and rode his bicycle straight to the Tingyang branch.

When they arrived at the Tingyang branch, Tian Yu was actually in his office.

They had a case to solve and stayed up all night, catching up on sleep in a daze.

However, upon hearing that Li Shu might have matched the description, he instantly sobered up and hurriedly asked who it was.

Li Shu handed over the documents.

Tian Yu glanced at the name and suddenly froze.

For a full few seconds, he suddenly erupted in rage.

In an instant, his eyes turned red, and the veins on his forehead bulged out.

"Holy shit, it was him!"

His voice cracked.

Li Shu was startled and quickly asked who it was.

Tian Yu uttered a single sentence and stormed out of the office.

"It's his boyfriend!"

Li Shu was also stunned.

I remembered the last time I went to Zhaqiao, the young man was chatting and laughing with Qiao Suqing with his back to me.

In an instant, I felt a chill rush straight to the top of my head.