Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Chapter 27 Extracting Fingerprints and Footprints

"Master, this developer is very stable. It was an old professor's trick when I was in college. It is specially used to develop water-immersion fingerprints."

Lu Chuan couldn't explain the origin of the skill, so he gave the fingerprint developer to the old professor.

"But this developer also has a disadvantage, that is, the developing time is short, only about ten seconds."

"So, we need to record the whole process, and each fingerprint must be photographed within ten seconds!"

Lu Chuan's words were resounding, and he was obviously very confident in his developer.

Yang Sen and Lao Bai looked at Liu Guodong. At this time, the director of the survey office needed to express his opinion.

Liu Guodong frowned: "I will decide to use the fingerprint developer prepared by Lu Chuan. If there is any problem, I will take care of it!"

"What are you taking care of? I agree. If something happens, come to me."

Lao Bai smiled: "I'm already at this age, and I'm about to retire. The most I can do is punish me."

Yang Sen also nodded: "Old Liu, there are only four of us in the survey office."

"Usually Lao Bai and I arrive late and leave early, but you never say anything."

"This will be risky, and there is no reason for you to resist alone."

"Besides, Xiao Lu was able to extract clear fingerprints at the scene of the fire, so this time it won't be bad, let's get started!"

Lu Chuan suddenly felt a warm current in his heart.

The three of them didn't know that they had a criminal investigation system, but they could still trust themselves unconditionally.

This is an acknowledgment of oneself.

All three of them agreed, and Liu Guodong nodded heavily: "The developer was prepared by Xiaolu. He is most familiar with the characteristics, so he sprayed it."

"Lao Bai is in charge of videotaping the whole process. Lao Yang and I took pictures of the developed fingerprints from two angles!"

Lu Chuan has already experimented with the spraying amount of the small watering can.

Spray it again in the air, confirm that there is no problem, and aim at the handlebar of the electric vehicle.

"I'm starting!"

Lao Bai has already set up a camera and is shooting outside.

Liu Guodong and Yang Sen are on both sides of the watering can.

The fine spray was scattered for a moment, and a magical scene appeared.

There were dense fingerprints on the handlebar, which was originally empty.

And it's light red.

Black developer, showing reddish fingerprints.

The contrast is very sharp!
Seeing the miraculous changes in front of them, Liu Guodong and the others had fiery eyes: "Xiao Lu, you can apply for a patent for this developer!"

"I'm stupid, Xiao Lu is awesome!"

"Xiao Lu, my niece really has the appearance of a prosperous husband, do you really stop thinking about it?"

Lu Chuan: "..."

With Lu Chuan's special fingerprint developer, the fingerprint collection work is progressing very quickly.

And the results far exceeded expectations.

"72 fingerprints..."

Tsk tsk, Yang Sen smacked his mouth again and again, sighing.

"There are still three sets of footprints!"

Lao Bai removed the camera and started to pack the tripod: "This time, we can be busy."

What Bai Wenhai said is correct, although the fingerprint collection has won the battle.

But the next job is the big game.

Fingerprint analysis.

72 fingerprints, some of which are superimposed, are very difficult to analyze.

The three of Liu Guodong must have stayed up all night recently.

Lu Chuan couldn't take it easy either.

Although he still has shortcomings in fingerprint analysis, footprint analysis is his strong point.

The footprints collected on the pedals of electric vehicles will also be analyzed today.

According to the news from the second group of operations, since the electric car was stolen, the murderer would definitely ride it.

It's like looking for a baby in Huajiexiangliu. It doesn't make sense to spend all the money. Let people do math problems.

The three sets of footprints collected now should have been left by the murderer.

"You guys compare and analyze now, and I'll report the situation to Team Qin."

Conference room one.

The whiteboard is already covered with photos.

The social relationship of the deceased Wang Lin is somewhat complicated.

The action team has been investigating for a day, but they haven't fully figured it out yet.

"This Wang Lin is the lead dancer at the Night Bar."

Sun Jun was doing the background introduction of the deceased: "So far, there are six ex-boyfriends who have been investigated."

"Have you found the dead man's cell phone?"

Qin Yong asked with a frown.

Sun Jun shook his head: "Not yet, the salvage team didn't find the mobile phone or any identity documents of the deceased in the reservoir, probably hidden by the murderer."

"How is the surveillance investigation near the reservoir?"

"Still investigating, no valuable clues have been found yet."

"Ren Qiang, how is your investigation going?"

"No witnesses have been identified so far."

Ren Qiang sighed: "There are few people around the Xingfu Reservoir, and only wild fishing people usually go there."

"If the deceased died within three nights before, the possibility of finding witnesses is not very high."

"However, we have made some progress in the investigation of the stolen electric vehicles."

"The traffic police found this based on the license plate."

The projection was turned on, and on the screen was a photo of the back of an electric scooter.

Looking at the somewhat blurred back on the screen, Qin Yong frowned: "Is there no frontal photo?"

Ren Qiang shook his head: "There is only such a photo, and it was night, so the photo is very blurry."

"This is an important clue, Ren Qiang, your team will follow up with all your strength!"

Qin Yong began to assign tasks: "Sun Jun, your group should do a good job of figuring out the deceased's ex-boyfriend, and find out the social relationship of the deceased in the shortest possible time."

boom!
Just after Qin Yong finished his report, the door of the conference room opened, and it was Liu Guodong.

Qin Yong's eyes brightened. The recent investigations of several cases have made great efforts.

In this case of dumping corpses in the reservoir, Xiankan was the first to verify the identity of the deceased.

Qin Yong originally arranged for Liu Guodong to investigate the electric vehicles salvaged from the reservoir, but looking at it now, there should be good news.

"Old Liu, did you find anything?"

Liu Guodong did not disappoint Qin Yong, and nodded emphatically: "We have used some special methods, and the fingerprints of the electric car have been extracted."

"Yang Sen and Lao Bai are comparing each other."

"We also collected three sets of footprints on the pedals of electric vehicles, and Lu Chuan is also analyzing them."

"The fastest..." Liu Guodong looked at the quartz clock on the wall: "The result will be available tomorrow morning."

The news of the current survey office lifted Qin Yong's spirits.

The other investigators also breathed a sigh of relief.

The current investigation office has played an important role in several cases detected by the Criminal Investigation Detachment recently.

Hopefully it will be hard this time.

"Okay, hurry up, the fingerprint information of the person associated with the deceased will be sent to you immediately."

The investigation on Wang Lin's personal network is still going on.

Fingerprint information of all persons interviewed was also collected.

Surveying the office now.

All four are busy.

There are 72 fingerprints, some of which are superimposed on each other, so it is very difficult to compare and analyze.

"Do separate fingerprints first, and the superimposed fingerprints are finally analyzed."

Liu Guodong made a division of labor: "The electric car was pushed into the reservoir, and the one who left fingerprints in the end should be the murderer."

"Then even if his fingerprints are superimposed, they are still the top one, and there is a great possibility of leaving them alone."

"Especially for fingerprints collected on relatively hidden parts such as wheels and back seats, priority should be given to comparison."

Push the electric car into the reservoir, and analyze the movement of the murderer pushing the electric car. These places are all possible to come into contact with.

As for Lu Chuan, without Liu Guodong's arrangement, he has already begun to analyze the footprints collected on the pedals of the electric vehicle.

Compared with the previous footprint analysis, the footprints collected on the pedals are only developed photos because they have been immersed in water.

There are some differences from normal footprints.

Of course, the principle of footprint extraction is different from fingerprint extraction.

Lu Chuan's developer is aimed at water immersion fingerprints, and some other methods are used to extract the footprints.

Among the three sets of footprints, the footprints on the left pedal are deeper, and those on the right are shallower.

The reason is that the driver rides an electric car and gets on the car from the left.

When getting on the bus, all body weight is concentrated on the left foot.

After riding, because most of the weight is carried by the seat, the footprint will be light.

The footprint on the right is less stressed, so it is naturally shallower, and even slightly invisible compared to the footprint on the left.

This is not a small challenge for Lu Chuan, who only has elementary footprint analysis skills.

Seven twenty in the morning the next day.

Lu Chuan stretched his arms, looked at the calculation paper on the table in front of him, and let out a long breath.

After a night of hard work, it is finally done.

(End of this chapter)