1995, Starting as a Criminal Investigation Expert

"yes."

One of them immediately shouted, "We can't just focus on the grips, we also need to look at the brakes!"

While riding, you not only need to hold the handlebars, but also squeeze the brakes.

Another said, "This brake is a very good metallic material; we can use amino black."

Ammonia Black 10B is also a protein staining agent, and like EOS staining agent, it has excellent effects on old blood latent fingerprints.

The final result is a blue-black pattern that is not noticeable on dark surfaces like the handle, but it shows up very well on bright metal surfaces.

Wang Ze'an walked up, gestured with his hands, and frowned, saying, "The key is for you to see."

He pointed to the far end of his finger, to the horizontal line below his fingerprint, and said, "When you squeeze the brake, you usually apply force from this spot, right? So, only a small part of the fingerprint will adhere to the brake, and it will be squeezed and deformed."

"Secondly, the pinching isn't done once; it's done repeatedly, so the probability of overlap is very high."

"This area is a triangular region, with richer features, but precisely because the lines are so complex, once they overlap, Li Shu, I'm afraid even using your jigsaw puzzle method, it won't be easy."

Li Shudao said, "We should at least give it a try."

Li Shu had already considered these difficulties; there was no doubt that they would be very challenging.

But for cases like this, we definitely have to give it our all.

"And it's not just the brakes, but also the seat. Think about it, when you get on the bike, you hold the handlebars with both hands, but when you get off, especially after you've parked the bike, what's your habitual action?"

Li Shu gestured.

After getting off the bike, grab the handlebar with your left hand, hook your right foot for support, and usually hold the seat with your right hand, making a lifting motion.

"Of course, it doesn't necessarily have to be the car seat. Everyone has different habits. It could be the back seat, but you'll definitely use your right hand."

Everyone was stunned for a moment, then nodded in agreement.

Li Shu added, "Also, the suspect was carrying a bag, right? He might have hung it on the handlebars. When he hung it up and took it off, his right hand should have touched the handlebar crossbar."

"If it's not hanging on the handlebars, it might get caught on the back seat. And this action of catching is generally done by grabbing the spring clip with the right hand, which can also leave bloody fingerprints."

"And the bells too. Pressing the bell with your thumb can leave fingerprints."

"So my idea is that we should take the entire bicycle and use different methods depending on the material to extract all the fingerprints we can."

Given the current situation, we have no choice but to take a piecemeal approach.

The more fingerprint samples collected, the easier it is to piece together a complete fingerprint.

Everyone nodded thoughtfully.

Tan Ligang glanced at Li Shu, and couldn't help but feel surprised.

He noticed something.

We are ultimately tech people, so our way of thinking may be somewhat limited, or perhaps too direct.

Science students are all straightforward; that's a common trait.

But Li Shu is different. I don't know if it's because he's young or what, but he thinks more deeply and is more grounded in reality.

They're more like salespeople; they think more deeply and are more resourceful.

He thought this might be one reason why Li Shu was able to come up with so many fingerprint comparison methods at such a young age.

Just like the rapid positioning method, now that I think about it, it would be hard to come up with it without rich life experience.

Now let's return to the case itself.

For us tech guys, focusing on the handlebars is probably the limit.

Yang Shaoting and his colleagues, who were in the business, might have thought of more things, such as brakes, bells, and back seats, but they didn't understand the technology and dared not interfere recklessly.

The information gap and differences in thinking between the two sides are what caused no one to notice this point.

On the contrary, Li Shu possesses both qualities and is able to pay attention to these details.

Of course, even if they had noticed it last year, without Li Shu's puzzle-like skills, it wouldn't have been of much use.

Blurred fingerprints, even if placed in the Second Research Institute, are considered abandoned.

Coming to his senses, Tan Ligang said, "Li Shu, let's do it your way, we'll cooperate with you."

One of them immediately ran outside: "I'm going to get the amino acid black."

Even if fingerprints are found now, they are all old fingerprints, and only protein staining agents can be used.

Fortunately, there's an amino black dye for light-colored objects and an EOS dye for dark-colored objects.

Liu Yaoqing and the others stood guard outside the door and did not come in.

Seeing someone rush out in a hurry, he quickly asked, "Xiao Chen, what happened?"

Xiao Chen said, "It worked, it extracted the data, but it's blurry."

With that, he ran off quickly.

Upon hearing that the sound was unclear, Liu Yaoqing's expression changed slightly, and he hurriedly got up and went inside.

Liu Xinfeng and Yang Shaoting hurriedly followed.

Several people burst in; Li Shu and the others were examining the bicycle.

"Li Shu, what's going on?"

Liu Yaoqing hurriedly inquired.

Li Shu glanced at Liu Xinfeng subconsciously.

His aura alone is far superior to Tang Weidong's.

He quickly explained the situation.

Turn off the lights. In the darkness, Liu Yaoqing squatted down, glanced at the fluorescent fingerprint on the right-hand grip, and couldn't help but frown.

Indeed, as Li Shu and others analyzed, the overlap and blurring occurred.

"Then how do we do this?" Yang Shaoting asked hurriedly.

Good news, the fingerprints have appeared. Li Shu is a really capable young man.

Bad news, even if it's shown, won't help.

Li Shu expressed his thoughts.

Liu Yaoqing nodded repeatedly, wondering if he could use Li Shu's puzzle-solving method to reconstruct the fingerprints.

Unexpectedly, Li Shu thought even deeper, considering the brakes, the seat, and the spring clips.

Even Liu Xinfeng and Yang Shaoting were slightly taken aback by these things.

To be honest, they themselves didn't think this far ahead last year.

Liu Xinfeng looked Li Shu up and down.

In 92, Director Zhao met Zhang Xin and was amazed by his talent. He went backstage to find Zhang Xin and said to him, "I have never seen your technique before. It is amazing."

Now, seeing Li Shu's ability in trace evidence examination, Liu Xinfeng has the same impulse.

This young man is definitely extraordinary.

Liu Yaoqing nodded and said, "Li Shu, do it your way. Li Gang, you two need to cooperate well."

This clearly puts Li Shu in charge of the overall situation.

"no problem."

Tan Ligang, who had been wearing a tense expression, now had a smile on his face.

He has been working in trace evidence examination for nearly 30 years, and today he is truly convinced.

Liu Yaoqing gestured for Liu Xinfeng and the other man to leave, leaving Li Shu and the others alone.

Upon arriving outside, Yang Shaoting hurriedly asked Liu Yaoqing what the probability of success was.

"Who knows?"

Liu Yaoqing's approach to toxicology research is characterized by meticulousness; he never speaks carelessly about things he's not certain about.

However, after a moment's thought, he changed his mind and said, "I think there is still a lot of hope. Firstly, Li Shu is very familiar with fingerprint extraction methods and has a very quick mind. He has creatively proposed many new methods. For example, he can extract fingerprints from the dermis of adipocere corpses."

Liu Yaoqing gave a direct example.

"Oh?"

Liu Xinfeng, standing next to him, raised an eyebrow.

Liu Yaoqing nodded and continued, "As for analyzing fuzzy and overlapping fingerprints, piecing together a complete fingerprint from multiple fingerprint samples, and finally comparing them by region, this entire workflow was devised by Li Shu himself."

"And there are also successful cases. You know Liu Zhenping from Yanling, right? He really approves of his method."

Liu Zhenping helped Tsinghua University research the fingerprint comparison system. As the deputy director, he was quite well-known within the system.

"Not to mention the Jianfeng Hotel case, which was solved with the help of Li Shu from 803. Zhou Xuewen praised him to me a lot on the phone."

The Jianfeng Hotel case was supervised by the Ministry, so the two of them knew more about it.

And the name 803 is even more renowned.

"So Shaoting, don't think that just because someone is young, they have potential. They may be young, but it's precisely because they're young that they have potential."

A man in his fifties or sixties can still work for a few more years.

Someone like Li Shu, who is only 21, could easily work for another 50 or 60 years.

Therefore, in Liu Yaoqing's view, Li Shu's youth is not a problem, but rather an asset.

Yang Shaoting quickly replied, "I really didn't think he was too young."

This has been brought up so many times.

Liu Xinfeng nodded slightly, then suddenly said, "Old Liu, wouldn't you want to keep such a talented person in the institute?"

Hearing this, it seems like it's a bit of a waste to put people in Nanjiang.