"Master, this developer is very stable. It was a trick of an old professor when I was in college. It is specially used to develop water-immersed 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, which is that the development time is short, only about ten seconds."
"So, we need to video record the entire process, and every 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 head of the site exploration office needed to express his position.
Liu Guodong frowned: "I'll make the decision to use the fingerprint developer prepared by Lu Chuan. If there are any problems, I'll be responsible for it!"
"What's your responsibility? I agree. If anything happens, come to me."
Lao Bai smiled: "I'm already this age and I'm about to retire. The most I can do is get punished."
Yang Sen also nodded: "Old Liu, there are only four of us in the current survey office."
"Lao Bai and I usually arrive late and leave early, but you never say anything."
"There will be risks, and there is no reason for you to fight it alone."
"Besides, Xiao Lu can extract clear fingerprints at the fire scene, so this time it won't be bad. Let's do it!"
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 recognition of yourself.
All three people agreed, and Liu Guodong nodded heavily: "The developer was prepared by Xiao Lu. He is most familiar with its properties, so he sprayed it."
"Lao Bai was responsible for video recording the entire process. Lao Yang and I took photos of the developed fingerprints from two angles!"
Lu Chuan had already tested the spray volume of the small watering can.
I sprayed it into the air again to confirm that there was no problem, and aimed at the handlebar of the electric bike.
"I'm starting!"
Lao Bai has set up a camera and is filming from the outside.
Liu Guodong and Yang Sen were on both sides of the watering can.
The fine spray spread for a moment, and a magical scene appeared.
There were dense fingerprints on the originally empty handlebar.
And it appears light red.
Black developer shows reddish fingerprints.
The contrast is very clear!
Seeing the miraculous changes in front of them, Liu Guodong and the others' eyes were blazing: "Xiao Lu, you can apply for a patent for this developer!"
"What a fool, Xiao Lu is awesome!"
"Xiao Lu, my niece really has the appearance of a prosperous husband, do you really want to stop thinking about it?"
Lu Chuan: "..."
With Lu Chuan's special fingerprint developer, the fingerprint collection work progressed very quickly.
And the results far exceeded expectations.
"Seventy-two fingerprints..."
Tsk tsk, Yang Sen smacked his mouth again and sighed.
"There are three more sets of footprints!"
Lao Bai took off the camera and started packing the tripod: "This time, we will be very busy."
Bai Wenhai was right, although the fingerprint collection was a victory.
But the next step is the highlight.
Fingerprint analysis.
There are seventy-two fingerprints, some of which are superimposed on top of each other, making analysis very difficult.
The three of them, Liu Guodong, must have stayed up all night recently.
Lu Chuan couldn't take any time off either.
Although he still has shortcomings in fingerprint analysis, footprint analysis is his strength.
The footprints collected on the pedals of the electric vehicle will also be analyzed today.
According to the information from Operation Two, since the electric bike was stolen, the murderer must be able to ride it.
It's like searching for a baby in alleys and alleys. It makes no sense to spend all the money. Let people do math problems.
The three sets of footprints collected now should be 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 was 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 Night Bar."
Sun Jun was introducing the background of the deceased: "Currently, six ex-boyfriends have been identified."
"Has the deceased's cellphone been found?"
Qin Yong asked with a frown.
Sun Jun shook his head: "Not yet. The salvage team did not find the mobile phone or any ID of the deceased in the reservoir. It is probably hidden by the murderer."
"How is the surveillance and investigation near the reservoir going?"
"We are still investigating, and no valuable clues have been found so far."
"Ren Qiang, how is your investigation going?"
"No witnesses have been found yet."
Ren Qiang sighed: "The area around Xingfu Reservoir is sparsely populated. Usually only wild fishermen go there."
"If the death time of the deceased was three days ago, it would be unlikely to find witnesses."
"However, we have made some progress in the investigation of 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 a person riding an electric bicycle from behind.
Looking at the blurry back figure on the screen, Qin Yong frowned: "Is there no frontal photo?"
Ren Qiang shook his head: "There is only one photo, and it was at night, so the photo is very blurry."
"This is an important clue, Ren Qiang, your team will follow up with all our strength!"
Qin Yong began to assign tasks: "Sun Jun, your team should conduct a thorough investigation of the deceased's ex-boyfriend and find out the deceased's social relationships in the shortest possible time."
boom!
Qin Yong had just finished his report when the door to the conference room opened and it was Liu Guodong.
Qin Yong's eyes lit up. In recent cases, great efforts have been made in the investigation.
In this case of corpse dumping in the reservoir, the investigation team was the first to verify the identity of the deceased.
Qin Yong originally arranged for Liu Guodong to survey the electric vehicles salvaged from the reservoir, but now there should be good news.
"Old Liu, have you discovered anything?"
Liu Guodong did not disappoint Qin Yong and nodded heavily: "We used some special methods and the fingerprints of the electric vehicle have been extracted."
"Yang Sen and Lao Bai are comparing."
"We also collected three sets of footprints on the pedals of the electric vehicle, and Lu Chuan is also conducting analysis."
"The fastest..." Liu Guodong looked at the quartz clock on the wall: "The results will be available tomorrow morning."
The news about the current survey office cheered up Qin Yong.
Other investigators also breathed a sigh of relief.
The investigation office has played an important role in several recent cases solved by the Criminal Investigation Detachment.
I hope it will come naturally this time.
"Okay, hurry up, the fingerprint information of the deceased's related persons will be sent to you immediately."
The investigation into Wang Lin’s personal network continues.
Fingerprint information of all persons questioned was also collected.
The current survey office.
All four people are busy.
Seventy-two fingerprints, some of which are superimposed on each other, make comparative analysis very difficult.
"The individual fingerprints are done first, and the superimposed fingerprints are analyzed at the end."
Liu Guodong divided the work: "The electric car was pushed into the reservoir, and the person who left fingerprints in the end should be the murderer."
"Then even if his fingerprints are superimposed, it will still be the one on top. There is a high possibility that it will be left alone."
"Especially fingerprints collected from more hidden parts such as wheels and back seats should be compared first."
Push the electric car into the reservoir and analyze the murderer's movements in pushing the electric car. These are all places where it is possible to come into contact.
As for Lu Chuan, without Liu Guodong's arrangement, he had already begun analyzing the footprints collected on the pedals of the electric vehicle.
Compared with previous footprint analysis, the footprints collected on the pedals were only developed photos because they were soaked in water.
It is a little different from normal footprints.
Of course, the principle of footprint extraction is different from fingerprint extraction.
Lu Chuan's developer is aimed at water-immersed fingerprints, and some other methods are used to extract footprints.
Among the three sets of footprints, the footprints on the left pedal should be deeper and those on the right should be shallower.
The reason is that when a driver rides an electric vehicle, he gets on from the left.
When getting in the car, all the body weight is concentrated on the left foot.
After riding, because most of the weight is borne by the seat, the footprint will be light.
The footprints on the right side bear less force and will naturally be shallower, even slightly invisible compared to the ones on the left side.
This was also a big challenge for Lu Chuan, who only had rudimentary footprint analysis skills.
It’s 7:20 a.m. the next day.
Lu Chuan stretched out his arms, looked at the calculation papers on the table in front of him, and let out a long breath.
After a night of hard work, it was finally done.
