People are sophisticated, and they exist everywhere.

Although Liu Guodong has no real power and only manages three people in the on-site survey office, it is different if the on-site survey is also responsible for trace inspection.

There are several criminal investigation squadrons under the Haizhou City Criminal Investigation Detachment, and they also have their own action groups, and cases occur every day.

And now to solve the case, except for the very few existing cases that can be caught on the spot, the rest need to be fixed with the help of the current investigation and trace examination.

For example, Lu Chuan's footprint analysis earlier.

Compared with footprint analysis, fingerprint comparison is a more common means of solving crimes.

In the current survey office, Liu Guodong, Yang Sen and Lao Bai are all experts in this area.

Of course, the so-called experts here are limited to the scope of the Haizhou City Criminal Investigation Detachment.

Fingerprint comparison, in fact, is a basic compulsory course for any criminal policeman, and even the film police of the police station can tell the truth.

Some of the more experienced auxiliary police officers can also do some of this.

But just like the flexible employment personnel standing on the street in the alley, compared with the service staff in the luxury club, there is a high probability that there is a certain gap in terms of technical sophistication and hardware facilities.

Some fingerprints with a good degree of integrity can be compared by the vast majority of criminal police.

But the reality is that many of the fingerprints collected at the scene of the crime are mutilated.

Or the deformation is severe, which requires a high level of technical ability.

Lu Chuan once studied fingerprint comparison when he was at the Public Security University, but it was impossible for a teacher to teach dozens of students by hand.

Therefore, even a high-achieving student like Lu Chuan, who graduated from the Public Security University, has to follow the old-timers step by step when he arrives at the actual job, accumulating bit by bit.

There are many cases and few technical personnel, and the on-site investigation office has become a sweet spot.

After all, no matter which squadron leader, the leader of the action group, you have to ask Liu Guodong and them.

The arson case in the southern suburbs, which was handled by the second action group, was one of the relatively large cases in the past few days.

However, it is only one of them, and there are two robberies where the fingerprints have not been compared, and Yang Sen and Lao Bai are lighting eye drops on the side.

The leader of the second group is called Ren Qiang, and Liu Guodong joined the police in the same year, and most of the people of their age are already a small head.

is definitely the backbone of the criminal investigation detachment, Ren Qiang took out cigarettes, distributed them to Liu Guodong and others, and personally lit them to Liu Guodong: "Just compare ten sets of fingerprints first, we have a clue to act first." ”

After listening to this, Liu Guodong's face changed, and he spit out the smoke ring after taking half a puff of the cigarette in his mouth: "Team Leader Ren, do you know how much time it takes to compare ten sets of fingerprints?" ”

"Look at Yang Sen and Lao Bai, their eyes are almost blind."

In Lu Chuan's opinion, Liu Guodong's expression was so exaggerated.

Yang Sen's eye drops were also habitual, and he only compared two sets of fingerprints all morning.

And all the comparisons failed, not to the point of overusing the eyes.

But Lu Chuan obviously wouldn't interject, and poured Ren Qiang a cup of tea: "Team Leader Ren, drink tea." ”

For Lu Chuan, the vast majority of people no longer look at him from the eyes of newcomers, and the detection of several cases a few days ago has made Lu Chuan's reputation in the criminal investigation detachment a lot louder.

"Thank you," Ren Qiang took the teacup, and his eyes rolled: "Lao Liu, I know that you have fewer things and more ......"

Ren Qiang then looked at Lu Chuan: "Do you want Xiao Lu to help compare?" ”

Lu Chuan was surprised, and hurriedly waved his hand: "Team leader, I can't do it." ”

"I still have a little research on footprint analysis, and in terms of fingerprint analysis, I have delved into fingerprint collection, but in terms of comparison, it really can't be done."

Although men can't say no, Lu Chuan thinks it's better to seek truth from facts.

In terms of fingerprint collection, he has the intermediate skills that are rewarded by the system, and he is confident that he can take charge at the level of the Haizhou Public Security Bureau.

But fingerprint comparison ......

As far as the little things he learned in school, not to mention comparing with Liu Guodong, a senior auxiliary police officer is estimated to be better than him.

"Okay, Lao Ren, I'm busy here, I have seen the fingerprints of your case."

Liu Guodong had actually seen the fingerprints of the arson case in the southern suburbs a long time ago: "A total of 36 sets of fingerprints were collected, except for a few incomplete ones, the rest were basically fingerprints after the fire." ”

casually pulled out the fingerprint file next to him: "Lao Ren, you are also an old criminal investigator, take a look for yourself, can this fingerprint still be called a fingerprint?" ”

"Don't say I can't compare, you just send it to the provincial department and let those experts compare, and the probability of matching is not high."

The scattered fingerprint files fell in Lu Chuan's eyes.

A bunch of black fingerprints, no, look at that, where are the fingerprints.

This must have been the case after the smoke and fire.

Ren Qiang smiled awkwardly, the fingerprints were collected by their second group, and he knew better than anyone what it looked like.

"Lao Liu, there is really no way, just collect these fingerprints, and we all stayed up for a day."

When it comes to fingerprint collection, it is best for the person who realizes the survey.

But in fact, there are only four people in the current investigation office, and they are too busy to sit at home and do trace examinations every day.

Unless there is a major case, such as a murder case, otherwise, Liu Guodong and others will not appear at all.

It's not that the shelves are big, it's really busy.

Therefore, the scene of some cases was investigated by the action team and collected evidence.

This was the case of the arson case in the southern suburbs.

"Lao Liu, can you think of a way?"

"It's really not good, these fingerprints basically have no value to compare."

"A bottle of Luzhou Laojiao!"

"Lao Ren, don't talk about one bottle, it's ten bottles, if you can't do it, you can't do it."

A bottle of Luzhou Laojiao is not good, Ren Qiang knows that what Liu Guodong said should be true.

With a sigh, Ren Qiang was about to get up and leave, and as soon as he walked to the door, he suddenly looked back at Lu Chuan: "Xiao Lu, you just said that you have research on fingerprint collection?" ”

Yes?

Lu Chuan, who was about to go to the cafeteria to cook, was slightly stunned, he did say so just now.

But Ren Qiang asked, obviously there was something.

As a qualified professional, Lu Chuan set his sights on Liu Guodong.

Ren Qiang also knew what Lu Chuan meant, although he had studied fingerprint collection, but whether he could go or not still depended on Liu Guodong.

"A bottle of Luzhou Laojiao, Xiao Lu will run a trip!"

Gee.

Liu Guodong smashed the corner of his mouth: "This is not a matter of the old cellar or the old cellar." ”

"After all, Xiao Lu has just arrived, and he has a little experience in footprint analysis, but he is inexperienced in fingerprint analysis, so he ...... collect it."

Liu Guodong glanced at Lu Chuan: "It's okay to try, but we can't guarantee that we will be able to collect clearer fingerprints." ”

Ren Qiang couldn't hear the meaning of Liu Guodong's words, patted his chest and looked upright: "Don't worry, it's picked up, the credit is surveyed, and it has nothing to do with you." ”

"The wine will be delivered later!"

Liu Guodong nodded with satisfaction, if he wants to say that he can do things, he has to be an old man.