Chapter 27 Extracting Fingerprints and Footprints
“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.”
< br>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 shortcoming, that is, the development time is short, only about ten seconds.”
“So, we need to record the entire process, and each fingerprint must be recorded within ten seconds. Finished taking photos within ”
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 site exploration office needed to express his position.
Liu Guodong frowned: "I will make the decision to use the fingerprint developer prepared by Lu Chuan. If there is any problem, I will bear it!"
"What is your responsibility? I also agree. Come to me if you have any trouble.”
Lao Bai smiled and said, “I’m already at 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 said anything."
"This time There are 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 will be good, 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 characteristics, so he sprayed it."
"Lao Bai was responsible for the entire video recording. Lao Bai and I Yang took photos of the developed fingerprints from two angles! "
Lu Chuan has 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 vehicle.
“I’m starting!”
Lao Bai has set up a camera and is filming from the outside.
Liu Guodong and Yang Sen are on both sides of the watering can.
The fine spray was 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 light red fingerprints.
The contrast is very clear!
Looking at 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 the hell, Xiao Lu is awesome!"
"Xiao Lu, my niece really has the appearance of a prosperous husband, do you really not think about it anymore?"
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 again while sighing.
“There are three more sets of footprints!”
Lao Bai took off the camera and started to pack the tripod: “This time, we will be very busy.”
Bai Wenhai said Yes, fingerprint collection has won the battle.
But the next step is the highlight.
Fingerprint analysis.
Seventy-two fingerprints, some of which are superimposed on top of each other, make 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 news from Operation Two, since the electric bike is 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 so far should be left by the murderer.
"You guys are comparing and analyzing now, and I'm going to report the situation to Team Qin."
Conference Room No. 1.
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 the Night Bar."
Sun Jun is introducing the background of the deceased: "Currently, there are six ex-boyfriends who have been investigated."
"The deceased Have you found your cell phone?" Qin Yong asked with a frown.
Sun Jun shook his head: "Not yet. The salvage team did not find a mobile phone or any identity document of the deceased in the reservoir. It is 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 the investigation there? "
"No witnesses have been found yet."
Ren Qiang sighed: "The area around Xingfu Reservoir is sparsely populated, and 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 the stolen electric vehicle."
< br>"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 a person riding an electric bicycle.
Looking at the blurry back figure on the screen, Qin Yong frowned: "Are there no frontal photos?"
Ren Qiang shook his head: "There is only one photo like this, 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 do a thorough investigation of the deceased's ex-boyfriend and find out the deceased's social relationships in the shortest possible time."
Bang!
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. Looking at it now, there should be good news.
"Old Liu, have you found 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 making comparisons."
"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 He looked at the quartz clock on the wall: "The results will be available tomorrow morning."
The news from 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 I can get hard this time naturally.
"Okay, hurry up, the fingerprint information of the deceased's related persons will be sent to you immediately."
The investigation into Wang Lin's interpersonal network is still continuing.
The fingerprint information of all persons questioned was also collected.
The current survey office.
All four of them 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 finally analyzed."
Liu Guodong divided the work: "The electric car was pushed into the reservoir, and the last person to leave fingerprints should be the murderer."
"Then even if his fingerprints are superimposed, they will still be the ones on top, and there is a high possibility that they will be left alone."
"Especially for fingerprints collected from more secret parts such as wheels and back seats, priority should be given Compare."
Push the electric car into the reservoir and analyze the movements of the murderer pushing the electric car. These places are all likely to be exposed.
As for Lu Chuan, without Liu Guodong's arrangement, analysis of the footprints collected on the pedals of the electric vehicle has already begun.
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 drivers riding electric scooters get on from the left side.
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 have less force and are naturally shallower, even slightly invisible compared to the ones on the left.
This is also a big challenge for Lu Chuan, who only has rudimentary footprint analysis skills.
7:20 am 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 finally happened.
(End of this chapter)