1995, Starting as a Criminal Investigation Expert

Chapter 115 Good lad, you're still holding back!

Inside the computer room, Li Shu operated the system himself.

The partition comparison method sounds simple; you just need to define the area.

But how big the area should be and where it should be divided depends on the operator's experience, and among all the people present, no one is more qualified than Li Shu.

Just then, an elderly man with a slightly hunched back and wearing black-rimmed glasses arrived.

"They're here."

Liu Yaoqing nodded in acknowledgment.

The visitor was Lin Peishi, the director of the First Research Institute.

Lin Peishi nodded slightly, glanced at Li Shu in front of the computer, and said in a low voice, "This must be Li Shu."

Liu Yaoqing nodded.

"Hopefully, the match will be accurate. This case can't be delayed any longer," Lin Peishi said softly.

Case 43: An accident occurred, and someone died.

The suspect was so frightened that he didn't dare to commit another crime for four months.

Firstly, it increases the difficulty of catching him.

Secondly, once the suspect has calmed down psychologically, no one knows how the situation will develop.

There is a certain probability that they will be so frightened that they will not dare to commit the crime again.

But everyone knows in their hearts that the probability of this happening is very small.

It's almost impossible to expect someone who commits such heinous crimes to repent and change their ways.

Then there can only be another direction.

They might either shift their operations to other cities to commit crimes.

Either the crime escalates, from assault to murder.

Therefore, the longer the case is delayed, the more serious the consequences will become.

Lin Peishi stared intently at Li Shu.

He knew that in the past few days, many people in the ministry had been keeping an eye on the progress here, or rather, on Li Shu.

I wonder if Li Shu will disappoint.

Li Shuxian started with the little finger, which had the best fingerprint condition.

Run the whole process once and see the results.

I quickly glanced at the most similar results, but none of them were correct.

as expected.

It's said to have the best conditions, but in reality, it's only half the area.

Li Shu marked out the area while picking up paper and pen to take notes.

Once a list is drawn, the top ten results are examined, and a number is recorded.

Then define it again, check the result, and record another number.

This process is repeated continuously.

Wang Ze'an, who was standing nearby, quickly noticed Li Shu's strange behavior. He glanced at the numbers Li Shu had recorded and found that they were all within ten.

Taking advantage of the break, he asked, "Li Shu, what are you recording? The number of similar items?"

He noticed that Li Shu only looked at the top ten results.

Li Shu shook his head and said, "It's about the level of accuracy."

Wang Ze'an didn't understand and asked what it meant.

Li Shu pointed to the screen and said, "If a computer were a person, each time I divide a region, it's like selecting some characteristic points from a fingerprint and describing them to it."

"After hearing my description, it will search for similar fingerprints in the database and send me the results."

"So when I define different features and give different descriptions, it will give different results."

"Then I will make a judgment, from 1 to 10, and give it a rating. The higher the score, the more similar the fingerprint result is to mine."

"Then through the scoring process, I can determine which descriptions I give it and which ones will give it more accurate feedback."

"In this way, we can find an optimal description and get the best results."

The partition comparison method is information that Li Shu obtained from the system.

But Li Shu did not rest on his laurels; he also explored and thought about how to make good use of this tool.

The current level of accuracy is a method that Li Shu figured out on his own to improve the hit rate.

Wang Ze'an was stunned for a moment.

Those present, including Liu Yaoqing, all showed thoughtful expressions.

But very quickly, everyone's faces showed a look of sudden realization.

"Well, you've been keeping secrets from me, buddy."

Wang Ze'an patted Li Shu on the shoulder and said, "That's not a good habit. What's wrong? Trying to write a paper that's just going to get nowhere?"

Li Shu explained, "No, I didn't even have that idea when I submitted the article."

Wang Ze'an was even more annoyed when he heard this, and said, "You're trying to provoke me, aren't you?"

It's only been a short time since I submitted the article.

According to Li Shu, this means that not long after devising the partition comparison method, he had a new idea and upgraded the method.

Wouldn't that be even more amazing?

Tan Ligang pulled Wang Ze'an aside and said, "Li Shu, your method is very good, but it requires extensive experience in fingerprint comparison."

Without extensive work experience, it's impossible to judge whether the feedback provided by the system is more accurate.

"Also, Zean is right. If you have any good methods, don't keep them to yourself, teach us too."

It wasn't that he was being polite; given Li Shu's current fingerprint comparison skills, he really needed to learn from him.

The people from the two institutes behind him nodded in agreement.

"Director Tan, you're exaggerating. I still have a lot to learn from you."

Li Shu was startled, then said, "I really didn't hold back. I can say that I used everything I knew for this case."

Tan Ligang believes this.

Not only in terms of fingerprint extraction and comparison methods, but also in terms of the probability model of crime geography, he believed that Li Shu had truly done everything he could for this case.

"So, how do you put it? Was the feedback good?" Tan Ligang pressed.

Li Shu shook his head slightly and continued repeating the same thing in silence.

The location near the entrance.

Lin Peishi nudged Liu Yaoqing with his elbow and said in surprise, "This kid is amazing, a bit like Zhang Xin from Matsuura, a genius."

Last year's serial theft case, Zhang Xin's incredible ability to create composite sketches truly amazed many people.

Liu Yaoqing nodded slightly, squinting at Li Shu, already seriously considering what reasons and methods he could use to keep Li Shu at the Second Research Institute.

Li Shu repeated it over and over again.

The so-called best description has already been figured out.

The final results showed a high degree of similarity, matching six feature points.

It's incredible that a fragmented fingerprint can match so many features.

Unfortunately, after careful examination and looking at the fingerprints on the other fingers, Li Shu was certain that it wasn't this person.

The ages don't quite match up either.

Li Shu sighed softly.

"Didn't it match?" Wang Ze'an's heart skipped a beat.

Everyone else felt a pang of anxiety, hoping that Li Shu's sigh wasn't a failure to find a match, but rather a reflection on how difficult things had been.

Unfortunately, Li Shu nodded.

"Oh shit!"

Wang Ze'an cursed and scratched his head violently.

One person hurriedly said, "We only compared the little finger, there are still four fingers to go, there's still hope."

Upon hearing this, Wang Ze'an quickly added, "That's right, there are still four fingers left."

At the doorway, Lin Peishi frowned.

Liu Yaoqing also let out a soft sigh.

They said there were still four fingers left, but even the little finger, which was the best match, didn't fit, which was tantamount to a death sentence.

Li Shu nodded and began comparing the other fingers.

The hope is slim, but what if it is?

The atmosphere inside the room was somewhat heavy.

Lin Peishi winked at Liu Yaoqing, then went outside and asked, "How's the progress on Academician Shi's side?"

Liu Yaoqing understood what he meant and said, "It will be soon, in the next day or two."

Lin Peishi nodded slightly, indicating there was still hope. He said, "If the fingerprints match, that would be the best outcome. If they don't, then... well—"

He didn't go on.

If the suspect has no criminal record or prior convictions, then no matter how advanced the technology is, fingerprint comparison will be useless.

Once fingerprints are blocked, relying solely on stakeouts and investigations will make solving the case a long way off.

Liu Yaoqing understood this, and after a moment's thought, said, "Actually, there is still hope."

Lin Peishi asked what it meant.

Liu Yaoqing briefly explained Li Shu's probability model, and then said, "Based on the current situation, there is a high probability that the suspect is from another province and came here to commit the crime. If Li Shu's probability model can work and analyze the city where the suspect is located, then the chances of finding him will be much greater."

Lin Peishi turned to look at Li Shu, who was operating the computer inside the room, and gasped, "Goodness, this kid's amazing! He even knows this?"

Criminology and criminal geography are both cutting-edge research areas internationally.

Li Shu not only understood it, but also figured out a better method than locating the center of the circle, which, as he himself said, was truly amazing.

So that's why.

Liu Yaoqing thought to himself, "What do you think? If it weren't for this, would I have been tempted to keep him at the Second Research Institute?"

"Probability Model —"

Lin Peishi repeated it twice, saying, "Old Liu, you can't miss out on this kind of talent again."

Zhang Xin became famous last year, and Liu Yaoqing had actually invited him to stay at the Second Institute to focus on forensic portraiture.

He refused, reluctant to leave Matsuura.

But we can't leave such a talented person unused.

Starting this year, the ministry encountered major cases and began frequently inviting Zhang Xin to help.

For example, in the department store case at the beginning of the year, Zhang Xin was invited to go there, drew a portrait of the suspect, and quickly arrested the suspect.

Liu Yaoqing said, "I know, I'm aware of it."

On the other side, Li Shu used the same old method, repeatedly dividing the area into zones to find the best description.

Unfortunately, after several hours of comparing all the fingerprints, a match still couldn't be found.

Seeing the somewhat tense atmosphere, Li Shu said, "It's alright. Once Academician Shi's system is upgraded, I think there's a good chance."

When multiple fingerprints are compared together, the hit rate will increase significantly.

Wang Ze'an nodded optimistically and said, "That's right, this is just the beginning. The Long March has just started, we haven't even crossed the snow-capped mountains and grasslands yet, it's still a long way off."

Tan Ligang nodded in agreement, but that wasn't what he really thought.

He was worried that the suspect had no criminal record.

Even if Li Shu's method is miraculous, it won't yield any results.

From Institute 1 back to Institute 2.

On the way, Li Shu inquired about the situation regarding the probability model.

Wang Zean said, "I already told you, you should be more optimistic. Once Academician Shi and the others finish the software, we'll definitely be able to compare them."

Despite saying that, he still explained the situation of the research project.

Geng Zheng is very interested in this topic, and in his spare time from teaching, he has already organized his students to start studying the model.

Meanwhile, Yang Shaoting also cooperated with Geng Zheng to screen the weighted factors and organized manpower to investigate the routes of surrounding counties and cities to Beijing.

Finally, he said, "If you have any new ideas, feel free to share them. If not, just wait for the results."

Li Shu nodded, admitting that he couldn't really help with things like studying mathematics.

Then we can only wait for Shi Qingyun's side.

The next day, knowing that Li Shu was free, Wang Ze'an specially arranged for someone to take Li Shu to Anjing for a visit.

You have to see the Forbidden City, and you have to climb the Great Wall.

"Don't keep putting on such a tense face. I'll say it again: let's take it one step at a time, do our best, and leave the rest to fate," Wang Ze'an advised.

He seemed optimistic, but since he also said he had done his best and left the rest to fate, it was clear that he was no longer as optimistic as he had been at the beginning.

Li Shu did not refuse.

Take a break and clear your mind.

After a day of sightseeing, Li Shu returned to the guesthouse and made a long-distance call to Tan Guoxiong.

"It's alright, I haven't been too busy these days."

Tan Guoxiong then asked Li Shu about the situation on his side.

Li Shu only reported good news and not bad news, saying that he was still working hard.

But Tan Guoxiong knew Li Shu very well, so he could easily hear the worry in Li Shu's words. After a moment of contemplation, he said, "It's good that there's hope. You've solved so many major cases, this one is definitely no problem for you."

"By the way, Zheng Cheng's accomplice has been confirmed; it's Guo Shaobo, the owner of the video store."

Li Shu's eyes lit up. He made the call to inquire about Zheng Cheng's accomplices, but he didn't expect to have already gotten results.

He hurriedly asked how he determined that.

Tan Guoxiong said, "Didn't you analyze before that Zheng Cheng was suspicious of going to kill Sun Xiaohui? You were right. Director Qian and his team found a clue from Sun Xiaohui's friend."

Qian Rui and his team conducted an in-depth investigation into Sun Xiaohui, carefully examining her social relationships.

Sun Xiaohui used to be a prostitute and knew many of her female friends.

One of the girls mentioned that last August, Sun Xiaohui and Zheng Cheng went to a nightclub together.

Zheng Cheng brought a friend with him at the time, namely Guo Shaobo.

Sun Xiaohui then called her over as well, and they drank together.

When she came back from the restroom, she overheard Guo Shaobo urging Zheng Cheng, saying it had been a year and asking when Zheng Cheng would go on another big heist, saying he was short of money lately.

She thought it was a business discussion and didn't think much of it.

Qian Rui could immediately confirm that this was a plan to commit another crime.

Although it is unknown why Zheng Cheng refused, it is at least certain that Guo Shaobo is a major suspect.

"Captain Song and his team went to the Northeast and haven't found him yet, but Guo Shaobo's parents are still in Nanjiang and will definitely come back. We'll catch him sooner or later," Tan Guoxiong said.

Li Shudao said, "That's wonderful."

He left in a hurry, and Zheng Cheng's case was not handled well, leaving a loose end. Now it has been completely brought to a close.

"Oh, by the way, I also have some good news for you."

Li Shudao said, "I won't go into the details, but there are two spots available now, one for you and one for me in the correspondence undergraduate program at the Public Security University. I'll send you the application forms later, so please fill them out and send them back to me as soon as possible."

Li Shu would definitely not refuse the opportunity to pursue a bachelor's degree through correspondence courses at the university.

After much consideration, I decided to pursue a correspondence course.

At the same time, given this rare opportunity, Li Shu certainly couldn't forget his good brother, Tan Guoxiong.

So, shamelessly, he asked Liu Yaoqing for an extra spot.

The person didn't refuse and generously gave it to them.

On the other end of the phone, Tan Guoxiong's breathing became rapid: "Li Shu, you're not lying to me, are you? Are you sure it's the Police University? Don't they have exams? We've already missed the exam time."

Li Shudao said, "Why are you asking so many questions? Just fill out the forms and that's it. In three years, you'll be an undergraduate student at the Public Security University."

With this academic qualification, even if it's from correspondence courses, one's future prospects in Nanjiang are incredibly bright.

Tan Guoxiong digested the good news for a long time before saying, "Li Shu, this opportunity is too important. I really can't bear to refuse. Li Shu, thank you."

Li Shu laughed and said, "What are you thanking me for? We're brothers."

On the other end of the phone, Tan Guoxiong sniffed lightly and nodded vigorously: "Yes, we are good brothers."

Li Shu waited another day, and then Shi Qingyun called to say that the system had been fixed.