Chen Zhen said: "I brought it back by Chen Changjin. If I need to extract fingerprints, this is ready-made."

Wang Hongwei was very happy.

This guy really surprised him repeatedly.

But it's useless.

"Don't throw it away. His cell can be piled up like mountains, DNA, hair, blood, and even dandruff. Not to mention fingerprints, there are several pairs of soles of his feet."

Chen Zhen still held it: "Don't worry about him, take it back."

It was almost 4 o'clock when he returned to the dormitory. Xiao Liu was still sleeping like a dead pig, and Chen Zhen was still sleepless.

He rushed to the desk beside the window, pressed the lamp, placed the beer mug and the switchblade under the lamp.

Take out the stick from the back, and a flashlight, and press it three times at the tail. The white light turns into red light, and then turns into blue light.

Turn off the desk lamp and shone it onto the cup with the blue light from the flashlight, which was covered with a large number of fingerprints.

Chen Zhen was delighted: "It's really useful."

This is not an ordinary flashlight.

It is a spectrum-type multi-band light source that Chen Zhen has obtained before.

Multi-band light sources are also common police equipment. The most basic portable multi-band light sources are essentially flashlights.

Three functions: low light, strong light, explosive flash.

Low light, color temperature 5000K, 200 lumens, is used to check handprints, footprints, fingerprints, fine traces, blood stains, and physical evidence surveys.

High light is mainly used for lighting.

The flash is used when confrontation, and it will blind others' eyes at any time.

A more advanced one is a 5-band light source, which has five types of light sources with wavelengths of red, blue, green, ultraviolet light, warm white light, and 400 nanometers to 635 nanometers.

For example, check for cleaned blood.

Even if the blood stains are wiped and cleaned, the heme in the blood will still remain. Spraying the heme with luminol reagent on the heme will cause oxidation with reactive oxygen species and release blue-purple fluorescence.

At this time, use an orange light source to shine, and the blood will appear clearly.

However, it is necessary to use chemical reagents, zinc chloride, cadmium nitrate, dichlorofluorescent agents, etc.

Chen Zhen, who has mastered the low-light tactical manual, has transformed into a survey expert and pressed a 450-nanometer blue light source, and dense sweat and dirt fingerprints crawled all over the cup.

Logically speaking, it is a bit troublesome to extract fingerprints at this time.

You need to use red phosphor and fingerprint brush, first brush the colorless fingerprint to fluoresce, and then use a fingerprint sticker to collect it.

Or, use a professional criminal investigation camera to take photos with an orange filter to obtain a JPG picture, then convert it to a PNG picture, use PS to adjust the color, and extract pure fingerprints before entering the computer.

But Chen Zhen doesn't need this.

It can be collected automatically.

Chen Zhen kept the light still, took out his mobile phone, logged into the system website, clicked out the bound spectrum multi-band light source APP, and clicked to scan and enter.

The phone is quite thoughtful and the prompts pop up.

"Is it allowed to retrieve camera permissions when an unknown application was detected?"

Click Yes.

Browse out of the interface similar to scanning the QR code on WeChat.

Chen Zhen chose a relatively complete fingerprint, scanned it for a while, and prompted [Scan successfully].

The system interface in front of me jumped out again, still with golden subtitles.

[Collection of fingerprint information, is it imported into the mobile police terminal?]

"Where is the terminal?" Chen Zhen asked.

【Please go to the vertical store to redeeate.】

Chen Zhen moved his mind and entered the vertical store.

After rummaging through for a while, he really found it.

Mobile police terminal, exchange points for 100 merit value.

You can access the public security information network encrypted, conduct business applications, log in to integrated platforms, police comprehensive platforms, mobile police platforms, blue signal and other work platforms.

Integrated fingerprints to support secure unlocking.

Can you also log in to the public security network?

Wouldn't that be able to query any file, query files, and retrieve suspect information?

These 100 points are worth spending.

Click 100 points to redeem, and the system will give the URL again, which is still the same as before.

Chen Zhen was familiar with the login website and found that there was another navigation bar on it, mobile police terminal, and major police comprehensive platforms were hung behind it.

A prompt pops up: [Does fingerprint information be read?]

Click [Read]

It's like watching a science fiction blockbuster.

The blue particles split and combine on the screen to form a photo of Shen Changjin.

Below are age, household registration, basic information, record records, personal information collection and DNA database.

Chen Zhen was really shocked.

With these two powerful tools, you can easily collect fingerprints and read case information. At least you are at the level of a detective.

You should know that the current public security system is quite comprehensive in terms of information collection. A small fingerprint can not only be used as key evidence, but also comprehensively compared. As long as you have a case, even if you have been to a hospital, even if you check in at work, you will enter fingerprints and DNA databases. At present, there are 6 million copies of DNA data collected, and the fingerprint data is more than 100 million. Using computer comparison, it can be compared in just over a dozen minutes.

It is not an exaggeration to say that it is half of the criminal investigation.

And can you easily retrieve it?

What kind of ghost talent is this?

With such ability, it would be too much to be able to be at the vice-ministerial level in this life?

Must be kept confidential.

Chen Zhen has begun to consider whether to build his own laboratory and find out the equipment in the store. What is Sherlock Holmes? Compared with him, he is a scumbag.

There was a blue and white light in the dark room. Chen Zhen was lying on the desk and projecting silhouettes on the wall, which really had a bit of mystery.

Turn your eyes to Chen Changjin's file again.

This guy has countless cases of case studies. In 1999, there was also a case of intentional homicide, but the evidence was insufficient and the case was not solved. The case is still open and he still has a suspect identity.

Seeing the identity information again, Chen Zhen murmured: "Didn't this guy say he is not married? Why does he have a daughter?"

Actually, if you think about it carefully, Chen Zhen found that there are still many things wrong with Chen Changjin. Logically speaking, the old hooligan who has been in the prison for so many years should have some sense of investigation.

A person who has been dealing with the police all his life.

But he acted like an idiot.

Press the desk lamp on, Chen Zhen repeatedly pressed it, pressed out a 500-nanometer wavelength orange light source, and began to check the switchblade to see if there was any blood.

It was also his purpose to cut off the switchblade.

If you solve another injury case, you will make a lot of money.

But after checking, nothing was found.

Pick up your phone and scan it.

The analysis report came out, and there was only some saliva information, and there was no calcium, phosphorus and magnesium. It was also detected that he had acute coronary syndrome, which was necessary to prevent myocardial infarction.

But overall, the blade is quite clean.

A strange thought came out: "Isn't this Shen Changjin too bad?"

But in less than two days, he will be arrested and brought to justice.

What was waiting for him was a long imprisonment, and Chen Zhen was in a short time.

After confirming that the monitoring system is working well, he turned off the lights and went to bed.
Chapter completed!