1995, Starting as a Criminal Investigation Expert

In the dark room, Li Shu and Wei Dejun worked together, constantly adjusting the angle of the porcelain basin to align with the ring finger of his right hand.

There are two handprints, and the clearest fingerprint is on the ring finger of the right hand.

Analyzing the action of holding something, the ring finger should bear the greatest pressure, making it the clearest point.

Secondly, the porcelain basin itself is a curved surface, so if you simply take a picture and extract the image, there will be distortion.

So we'll stick to the old method: use the roulette wheel and unfold the curved surface.

Outside the door, Han Jianjun and others were chatting and waiting.

Before we could even exchange two sentences, Xu Qiang arrived.

As he entered, he boasted with a grin, "Let me guess, judging from your expressions, you must have successfully extracted your fingerprints."

Han Jianjun looked at him and said, "Do you have a dog's nose, or are you watching us every day? We just finished taking fingerprints here, and you came over here."

Xu Qiang pointed to his ear and said, "I can hear it. As soon as you guys cheer, I know it's almost certainly a success."

After saying that, he leaned closer and asked if the comparison had matched.

Cao Junfei said, "Chief Xu, didn't you say you thought we were comparing data too quickly and wanted us to take a break? Then why are you so concerned about whether we've matched data or not? You're not in a hurry anyway."

Han Jianjun nodded in deep agreement.

"Who?"

Xu Qiang quickly said, "Who said that? Tell me, and I'll criticize them right away. What do you mean by 'take a break'? If you guys take a break, then half the sky of our criminal investigation team will collapse."

Han Jianjun chuckled and said, "Good heavens, what have we done to deserve being called half the sky of the detachment?"

Cao Junfei, in a comedic tone, said, "So it's only half a side."

Xu Qiang hurriedly said, "You are the sky for our detachment."

The technical team deserves the most credit for solving these recent major cases.

It wouldn't be wrong to say that the detachment is the only force in the area.

Then, the door to the secret room opened, and Li Shu and the other man walked out.

Xu Qiang's eyes lit up, and he quickly stepped forward, smiling broadly as he said, "You've worked so hard, Li Shu. Look how thin you've become. Once the case is solved, I'll definitely have to make Lao He treat us to a big meal at Jufengyuan."

Li Shuxin thought to himself that He Chenghua was definitely not going to get away with this meal.

Knowing why Xu Qiang had come, he said, "Chief Xu, we've only extracted the fingerprints so far; we don't know yet if they'll match."

Fingerprint extraction is only the first step; the key is whether a match can be made.

Xu Qiang followed Li Shu towards the computer room and said, "You've always been incredibly lucky, you'll definitely be able to match it. Besides, I know this case well, the suspect is definitely a veteran, and most likely has a criminal record."

They had assessed the suspect's identity at the time.

The crime was committed cleanly and efficiently, demonstrating rich experience and, most importantly, ruthlessness.

The saying goes, "misfortune should not extend to family members." Huang Youjun and Kang Guiying lived separately. If the suspect's goal was to retaliate against Huang Youjun, he could have gone straight to Xinding Jiayuan.

Instead of first controlling Kang Guiying, demanding Huang Youjun come over, and then cold-bloodedly killing Kang Guiying.

Of course, the suspect may not have known that Huang Youjun had moved out.

But he could just ask Kang Guiying.

Since he chose to commit the crime in Yanglu Lane, his purpose was clearly to wipe out the entire family and take revenge on Huang Youjun's mother as well.

Another point.

Huang Youjun was an old scoundrel who later made a living by lending money at exorbitant interest rates, harming many people.

It can be said that none of the people Huang Youjun came into contact with were good people.

Plus, they can get their hands on guns.

The entire task force was convinced that this person must have a criminal record.

"I hope so."

Li Shu entered the computer room, turned on the machine, scanned, preprocessed, and then compared the results.

The results came back quickly.

Li Shu quickly clicked on the result with the highest success rate.

One glance and my heart skipped a beat.

wrong!

They look similar overall, but there are significant differences in the details.

More importantly, this is an inmate who went to prison in 91 and has not been released yet, so it is impossible for him to have committed the crime.

I also glanced at the fingerprint with the second highest probability.

Actually, it's all unnecessary to look at.

If the fingerprint is clear enough and there's a database, it can basically be matched.

As expected, that wasn't the case.

"Didn't match?" Xu Qiang knew the result as soon as he saw Li Shu's reaction.

Han Jianjun frowned and said, "It's alright, we have both hands, let's compare them, maybe..."

He didn't continue.

Li Shu extracted the clearest fingerprints and used an original curved surface unfolding method to capture fingerprints with accurate proportions.

There's not much difference between comparing one fingerprint and ten fingerprints.

So if there's no match, then it really doesn't exist.

Li Shu was also aware of this; there was a high probability that this person was not in the game.

But what if?

So they went back to the darkroom and used the same method to photograph the other fingerprints.

I worked on it until late at night before finally finishing all the work.

Further comparisons were made, even using a partitioned comparison method.

The result remained the same; the match still failed.

"Captain He, I'm sorry." Li Shu went out.

He Chenghua arrived midway after hearing the news and hurriedly said, "It's alright. Although it didn't match, at least we have his fingerprints."

"As long as we have this fingerprint, just like in the Jianhua Hotel case, no matter how far or how many years have passed, we will eventually find him."

"So Li Shu, I still want to thank you properly for this case. Jufengyuan, please arrange a time sometime, and I'll treat your technical team to dinner."

He Chenghua must have felt regretful upon learning the result.

However, in terms of the case itself, there has been a major breakthrough.

After all, this is a fingerprint, unlike any other physical evidence.

In criminal investigations, forensic medicine answers how a person died, while footprints and tool examinations answer how many people committed the crime and how they did it.

Only fingerprints answered the most crucial question: who did it?

Now that fingerprints have been extracted, it can be said that the suspect has been identified to some extent, even if we don't know who he is yet.

"By the way, I heard you haven't had dinner yet after being so busy. How about this, let Xiaodong join you guys and find a place to eat."

He waved to Jiao Xiaodong beside him.

Compared to Xu Qiang, he was much more generous.

Li Shu hesitated for a moment, then nodded.

That concludes my work; now it's up to the criminal police.

After leaving the technical brigade, He Chenghua went straight to the detachment office.

Xu Qiang didn't leave.

Xiao Rui and his team didn't leave either. The taxi robbery case wasn't finished yet, and Li Shu brought over the fingerprint comparison results for 14 more cases. Just as Hu Guoen had thought, not only their First Brigade, but also the Second Brigade would be busy for the next period of time.

"Didn't it match?" Xu Qiang asked.

He Chenghua nodded.

Xu Qiang had anticipated this outcome. After thinking for a moment, he immediately called Shao Guiying, Xiao Rui, and several other leaders to hold a brief meeting.

This is no small case. Now that there has been a significant breakthrough, we certainly can't let it go.

Xu Qiang offered cigarettes to everyone, then pondered for a moment and said, "Next, let's discuss where to go for the comparison first?"

Since no match was found locally, the next step is naturally to compare fingerprints in other cities or even other provinces.

The key question is where to go.

With so many provinces and cities across the country, there must be a specific order of precedence.