1995, Starting as a Criminal Investigation Expert

Far away in Anjing.

Xicheng District, Muxidi.

Here is the school that Li Shu dreamed of during his college entrance examination: the People's Public Security University.

Just outside the south wall of the school, there is a six-story office building with an earth-yellow exterior.

This is the main building of the Second Research Institute.

Deep inside the second floor is the editorial department of criminal technology.

The entire editorial department wasn't very big; there were three editors in total, including two deputy editors-in-chief and one editor-in-chief.

Firstly, Criminal Technology is a bimonthly publication, and its target audience is the public security system, not the general public. The content is limited, so the workload is not that heavy.

Secondly, the journal has an editorial board of more than 30 people, spread across the country, who are experts in various fields of criminal science.

If there are any important manuscripts, we will invite them to help with the review.

Then you won't need so much editing in your daily work.

"Old Wang, who are you talking to on the phone? You haven't finished talking yet?"

A colleague placed a lunchbox on Wang Ze'an's desk.

Wang Ze'an didn't go to lunch earlier, but after finishing his meal and resting for a while, he came back and was still on the phone.

Wang Ze'an waved his hand and then said, "Li Shu, your idea is excellent. Write it down as soon as possible and mail it to me at the address I gave you before."

"Okay, that's all for now. We'll contact you again later."

He hung up the phone with a cheerful laugh.

Without touching the lunchbox, he grabbed a stack of papers from the table, turned around, and ran upstairs.

Research is conducted on the fourth to sixth floors, while the third floor is used for daily office work.

The institute's director, Liu Yaoqing, works here.

"teacher!"

Wang Ze'an pushed open the door, and Liu Yaoqing was still his mentor.

The office was small, with bookshelves on two walls filled with all kinds of books. Behind a simple desk, Liu Yaoqing, wearing glasses, was engrossed in various documents.

Liu Yaoqing is 58 years old this year and has an impressive resume.

He graduated with a degree in chemistry and then taught at the Police Cadre School of the Ministry of Public Security, the predecessor of the Criminal Police Academy, after graduating in 63.

In 72, when 126 institutes were being established, he was one of the founders and was responsible for the establishment of the physics and chemistry laboratory.

He specializes in toxicology identification. In 80, as one of the first batch of government-sponsored visiting scholars in China, he studied in the United States for only two years and became an internationally renowned toxicology identification expert.

After returning to China, I have been working at the Second Institute, where I served as editor-in-chief and director. In the past two years, I have also served as the vice president of the neighboring People's Public Security University.

"What's wrong?"

Liu Yaoqing looked up and asked.

"Teacher, look at these."

Wang Ze'an handed over the manuscript he had taken notes on, and then said excitedly, "That Li Shu, the author of the rapid positioning method and the regional comparison method, you haven't forgotten him, have you?"

"That's true."

Liu Yaoqing thought to himself, "It hasn't been that long. I'm not senile yet."

Liu Yaoqing had a deep impression of the name Li Shu.

It's not because of the partition comparison method, nor the fuzzy fingerprint analysis and speculation, but because of the rapid positioning method.

At present, only a few AFIS systems have been implemented nationwide.

In the foreseeable future, this thing is unlikely to be spread all over the country.

Especially in remote areas, where funds are limited, they simply cannot afford it.

Therefore, hand-rubbing comparison will still be the mainstream method.

In this situation, Li Shu's rapid positioning method is truly invaluable.

First, the comparison efficiency has been improved several times over.

Secondly, it requires almost no cost, relieving grassroots staff of any pressure.

Another point is that after the fingerprinting points are marked, they can even be handed over to ordinary people who do not understand fingerprint comparison for preliminary screening, which greatly reduces the workload of professionals.

Fingerprint comparison has always been an important method for solving crimes.

However, manual labor is inefficient and prone to errors.

If this method were promoted now, it might be able to solve countless cases.

Liu Yaoqing then made the decision to feature the article on the front page and planned to promote it through internal reference materials.

"Oh right, didn't I tell you to contact this Li Shu? There's something I forgot to mention, but I just remembered it."

Liu Yaoqing didn't rush to read the contents, and said, "I've thought about it. After all, this method was invented by someone else. When we promote it, could we name this method the Li Shu Positioning Method? It would be a kind of reward."

An innovative technological invention will definitely be rewarded in the head office.

However, considering the significance of promoting this method, Liu Yaoqing felt it was still insufficient.

Why not just name it the Li Shu Positioning Method, so that Li Shu's name can spread throughout the country?

"Wow."

Wang Ze'an exclaimed in surprise. As a young technical backbone of the institute, he dreamed of doing some kind of technical research that would go down in history.

Li Shu, a low-level police officer, achieved this first.

"Tell him about it later."

After giving his instructions, Liu Yaoqing glanced at the manuscript in his hand. He raised an eyebrow at just one look and muttered, "Curved fingerprint unfolding?"

Wang Ze'an nodded hurriedly and stepped forward to explain the situation.

In the end, he exclaimed, "Teacher, this kid is a real treasure!"

Sure enough, a casual chat uncovered several innovative methods for fingerprint identification.

A flash of shock crossed Liu Yaoqing's eyes, but he remained calm and quickly looked at what Wang Ze'an had recorded.

It wasn't a paper; it was just an oral presentation.

But precisely because of this, it becomes more insightful.

For example, regarding the curved fingerprint sensor, Wang Ze'an even drew a schematic diagram based on his own understanding, explaining why it needs to be spliced ​​and why side lighting is required, making it very clear.

Therefore, Liu Yaoqing understood immediately.

After understanding it, a thought subconsciously popped into his mind: why use optical photography instead of direct film transfer?

But the next moment, I understood.

Adhesive transfer is not a panacea. Some curved surfaces are more complex and cannot be perfectly adhered to. Furthermore, during the transfer process, dust and other impurities may also be picked up along with the adhesive tape.

Furthermore, the process of transferring the original evidence actually damages the original physical evidence, which violates the principle of "preferential treatment for non-destructive evidence collection" in criminal evidence collection.

Optical imaging, on the other hand, records all the shapes of fingerprints completely and has better adaptability to various curved surfaces.

It can also use polarizing filters, which are suitable for different carriers.

and so……

Liu Yaoqing took a deep breath and immediately perked up.

Upon seeing this, he felt that it was Li Shu's work.

Like the rapid positioning method, it uses the simplest means to solve complex problems, which has a kind of pure beauty of simplifying the great way.

"Good idea."

Liu Yaoqing glanced at the next image, only needing a quick look before he was utterly shocked: "Good heavens, fingerprints can even be extracted from the dermis layer of adipocere? Ze'an, is he just speculating?"

That seems unlikely.

The skin was completely adipocere, covered in wax, making it impossible to extract fingerprints from the dermis.

Wang Zean said, "Teacher, there are cases where they used this method to solve a murder case."

Liu Yaoqing was taken aback; he hadn't expected there to be such an example.

He quickly looked down.

Soon, I understood the principle behind it. After thinking about it for a moment, I was surprised to find that it actually worked.

"Incredible! How did he come up with that? To think of using the permeability of pores to freeze a corpse and then thaw it—brilliant!"

Liu Yaoqing clicked his tongue in amazement.

Wang Zexin thought to himself that this was nothing, and said, "Do you know that he also prepared his own protein staining agent, and then covered it with paraffin oil, which not only solved the problem of the difficulty in observing blood latent fingerprints on dark carriers, but also solved the problem of photographing rough, textured fingerprints."

"That's amazing, I have no idea how he came up with that."

To his knowledge, eosin Y had never been used for biological staining before.

Then it also needs to display specific fluorescence under a specific wavelength of light source. I don't know how Li Shu figured it out.

"Oh?"

Liu Yaoqing was startled and hurriedly asked which one it was.

"By the way, you mentioned blood latent fingerprints on dark carriers?" Liu Yaoqing frowned suddenly, a case popping into his mind.