"Master, this developer is very stable, and it is a trick of an old professor when I was in college, and it was specially used to develop water-soaked 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 development time is short, about ten seconds."

"So, we need to record the whole process and take every fingerprint in 10 seconds!"

Lu Chuan's words were loud, obviously very confident in his developer.

Yang Sen and Lao Bai's eyes looked at Liu Guodong, and at this time, the director of the field survey office needed to make a statement.

Liu Guodong frowned: "I'll use the fingerprint contrast agent prepared by Lu Chuan, if there is any problem, I will bear it!" ”

"What do you bear, I also agree, find me if something happens."

Lao Bai smiled: "I'm at this age, and I'm about to retire, so the most I can do is to carry a punishment." ”

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

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

"It's risky, and there's no reason for you to fight alone."

"Besides, Xiao Lu can extract clear fingerprints at the fire scene, and it won't be bad this time, let's do it!"

Lu Chuan suddenly felt a warm current in his heart.

The three of them don't know that they have a criminal investigation system, but they can still trust themselves unconditionally.

It's a recognition of yourself.

The three of them all agreed, and Liu Guodong nodded heavily: "The developer is prepared by Xiao Lu, and he is most familiar with the characteristics, so he will spray it." ”

"Lao Bai is responsible for recording the whole process, and Lao Yang and I are divided into two angles to take pictures of the developing fingerprints!"

The amount of spraying in the small watering can, Lu Chuan has already experimented.

I sprayed the air again, confirmed that there was no problem, and aimed at the handlebars of the electric car.

"I'm here I go!"

Lao Bai has set up a camera and is filming on the periphery.

Liu Guodong and Yang Sen are on either side of the watering can.

A small spray was sprinkled for a moment, and a magical scene appeared.

On the handlebars, where there was originally nothing, dense fingerprints appeared.

And it has a reddish appearance.

Black contrast agent with a reddish fingerprint.

The contrast is very clear!

Looking at the magical changes in front of them, Liu Guodong's eyes were blazing: "Xiao Lu, you can apply for a patent for this developer!" ”

"I'm grass, little land!"

"Xiao Lu, my niece really has a prosperous husband, do you really not think about it anymore?"

Lu Chuan: "......"

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

And the results have far exceeded expectations.

"Seventy-two fingerprints ......"

Tsk, Yang Sen smashed his mouth again and again, sighing.

"And three sets of footprints!"

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

Bai Wenhai is right, although fingerprint collection has won the battle.

But that's where the rest comes in.

Fingerprint analysis.

Seventy-two fingerprints, some of which are superimposed, make it very difficult to analyze.

Liu Guodong and the three of them must have stayed up all night recently.

Lu Chuan couldn't be idle.

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

The footprints collected on the pedal of the electric vehicle will also be analyzed today.

According to the information from the second action group, since the electric car was stolen, the murderer will definitely ride it.

It's like looking for a baby in the streets and alleys, there is no reason why the money is spent, let the family do math problems.

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

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

Conference Room 1.

The whiteboard is already plastered with photos.

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

The Action Team has been investigating for a day, but it hasn't fully figured it out.

"This Wang Lin is the lead dancer of the night bar."

Sun Jun is introducing the background of the deceased: "At present, there are six ex-boyfriends who have been investigated. ”

"Has the deceased's phone been found?"

Qin Yong frowned and asked.

Sun Jun shook his head: "Not yet, the salvage team did not find any mobile phone and any identity documents of the deceased in the reservoir, it is estimated that they were hidden by the murderer." ”

"How's the surveillance survey going near the reservoir?"

"The investigation is still ongoing, and no valuable clues have been found yet."

"Ren Qiang, how is the investigation over there?"

"No eyewitnesses have been found yet."

Ren Qiang sighed: "The area around the Happiness Reservoir is sparsely populated, and usually only wild fishers go there. ”

"If the time of death of the deceased had been three days ago and the night, it is unlikely that witnesses could have been found."

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

"According to the license plate, the traffic police found this."

The projection turns on, and on the screen is a photo of the back of a riding an electric car.

Looking at the somewhat blurry back on the screen, Qin Yong frowned: "Don't you have a frontal photo?" ”

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

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

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

Bang!

Qin Yong had just finished his report, and the door of the conference room opened, and it was Liu Guodong.

Qin Yong's eyes lit up, and in the last few cases, the current investigation has made great efforts.

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

Qin Yong originally arranged for Liu Guodong to survey the electric car salvaged from the reservoir, but now that he looks at it, there should be good news.

"Lao Liu, have you found anything?"

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

"Yang Sen and Lao Bai are making comparisons."

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

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

The news of the current survey office made Qin Yong feel uplifted.

The other case-handling personnel also breathed a sigh of relief.

In several cases recently solved by the Criminal Investigation Detachment, the Investigation Office has played an important role.

I hope it will harden up this time.

"Okay, hurry up, the fingerprint information of the deceased's related person will be sent to you immediately."

The investigation into Wang Lin's network continues.

The fingerprints of all the people questioned were also collected.

Survey Office.

All four of them were busy.

Seventy-two fingerprints, some of which are superimposed on each other, are very difficult to compare and analyze.

"Do separate fingerprints first, and then analyze the superimposed fingerprints last."

Liu Guodong made a division of labor: "The electric car was pushed into the reservoir, and the murderer should be the last one to leave fingerprints." ”

"Then even if his fingerprints are superimposed, they are also the top one, and it is very likely to be left alone."

"Especially in the fingerprints collected in more private parts such as wheels and back seats, priority should be given to comparison."

Pushing the electric car into the reservoir and analyzing the killer's action of pushing the electric car are all possible to come into contact with.

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

Compared to the previous footprint analysis, the footprints collected on the pedal were only developed due to flooding.

And normal footprints, there are some differences.

Of course, the principle of footprint extraction is not the same as fingerprint extraction.

Lu Chuan's developer targeted water-immersed fingerprints, and some other methods were used to extract footprints.

Among the three groups of footprints, the footprints on the left pedal should be deep, and the right one should be shallow.

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

When you get into the car, focus all your body weight on your left foot.

After riding, because most of the weight is carried by the seat, the footprints will be lighter.

The footprints on the right side are less stressed, so they will naturally be shallow, and even slightly invisible compared to the left side.

This is also a big challenge for Lu Chuan, who only has basic footprint analysis skills.

The next day at 7:20 a.m.

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

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