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

Chapter 9 Anping Electronics Factory

In recent years, in the investigation and handling of various criminal cases, the role of spot investigation has become more and more significant.

From a part-time job more than ten years ago, any criminal policeman could come up and show his hands, and now it has developed into a special department category.

In particular, the criminal investigation detachments of the municipal bureaus in various places have basically established professional teams for field surveys, and most of them have two sets of brands and one team for trace inspection.

This is the case of the Haizhou Criminal Investigation Detachment. The on-site investigation and the subsequent evidence verification were all completed by the four of Liu Guodong.

Of course, there are also some powerful criminal investigation detachments. There are more than a dozen people in the current investigation, and there are also more than a dozen people in the trace inspection. This is generally at least a provincial capital-level detachment.

Footprints are commonly extracted information in current surveys, and footprint analysis has gradually developed into a specialized discipline.

However, whether it is the Public Security University or the front-line criminal investigation detachment, there is an extreme shortage of talents in this area.

There are many reasons. On the one hand, the teaching is not very systematic. On the other hand, some skills are cherished by everyone. On the other hand, there is limited room for career advancement.

There are really people who are willing to teach, but not necessarily people who are willing to learn.

Compared with fingerprint identification, footprint analysis is relatively backward.

Therefore, it is relatively rare for Lu Chuan to obtain footprint analysis skills through the system, although it is only elementary.

However, even if he is a beginner, it can only be said that Lu Chuan has not mastered some things, but it does not mean that the skills rewarded by the system will make mistakes.

Footprint analysis has many methods from measurement.

The first is the determination of the imaginary edge. For a shoe print, the center of gravity is concentrated in the palm.

But because human feet have arches, normally the middle of the shoe print has the shallowest traces, and the soles and heels have the heaviest traces.

Then take the center of the sole of the foot as the center point, the more outward, the shallower the trace of the shoe print will be, and a virtual edge will be formed at the edge.

For shoes of the same size, the size of the imaginary edge is different, which means that the weight of the owner is different.

The larger the weight, the smaller the imaginary edge.

Combined with the length of the shoe print, the height and weight of the owner of the shoe print can be obtained through calculation.

But in this case, the shoe prints left by the suspect have irregular front and rear imaginary edges, sometimes big and sometimes small.

Although this difference is very subtle, it can still be measured.

In this case, it is very likely that the other party is wearing shoes that do not match the actual size.

At the same time, the imaginary edges on the left and right of the soles of the feet are also different.

In other words, the opponent's shoes are not only longer than the actual size, but also wider.

Combined with the length of the stride and the weight calculated based on the depth of the footprints at that time, Lu Chuan determined that the owner of the footprints was a woman.

It's just a pair of men's shoes, and they are one size bigger.

No wonder they couldn't find the suspect, and the gender was all wrong. How could they be caught? !

After repeated calculations to make sure that his judgment was correct, Lu Chuan continued to speculate on the suspect's physical characteristics based on the data of the shoe prints.

"The inner edge of the shoe print is slightly heavier, and the outer edge is slightly lighter...the opponent is an X-shaped leg."

"Excluding the influence of the virtual edge, the opponent's foot length should be 24 centimeters...he is about 1.6 meters nine, and weighs about 61 kilograms..."

An hour later, the suspect's features had been marked in detail.

Gender female, height 1.6 meters nine, weight 61 kg, aged between 32 and 37, with X-shaped legs.

"Ding"

"The basic task is completed, and the host uses the footprints to analyze the physical characteristics of the suspect in the robbery and wounding case."

The moment Lu Chuan finished the calculation, the notification sound that the system completed the basic task appeared.

Next, Lu Chuan opened another pile of data, which was all the surveillance data near the crime scene at that time.

During the period of robbery, a total of 32 people had their image information collected.

Of course, the suspect did not necessarily go through the monitoring of the portraits collected at that time, and this is just an investigation data.

Lu Chuan opened the files and compared the portrait photos one by one.

Within a few minutes, Lu Chuan's eyes were fixed on a woman named Zhang Yan!

"Hey, it's you!"

Holding the photo of the woman, Lu Chuan locked the door of the survey warehouse and went straight out of the Criminal Investigation Detachment.

"Lao Yang, are you in the house?"

Unlike Lu Chuan who was assigned to the Criminal Investigation Detachment, Yang Lin was assigned to the police station after graduation and became a film policeman.

Coincidentally, the place where Zhang Yan lives is in the area that Yang Lin is in charge of.

Huaguang Street Police Station.

Yang Lin poured tea for Lu Chuan, and took Zhang Yan's information: "This person lives in a low-rent housing, I'll check the information."

Given the relationship between the two, Lu Chuan directly explained his intentions: "This Zhang Yan is a suspect in a robbery and wounding case last year. See if you can collect her footprints. If you can compare them, this case will be solved." gone."

"No problem, you sit down first, I'll be right back."

Although the work in the police station is complicated, it is relatively easy.

Generally speaking, the cases taken over by the police station are mostly neighborhood mediation, petty theft and the like.

Once the eight types of major criminal cases occur, they must be handed over directly, and the police stations generally only do some work to cooperate with the investigation.

Of course, this does not mean that the police station must not be able to investigate criminal cases. If some cases are not solved for a long time after they are handed over, the police station can also apply for their return.

Of course, a murder case is impossible, and no police station went back to apply for a murder case.

Like Lu Chuan, Yang Lin came from a professional background, and most of the work in the police station was relatively simple for him.

Within 2 minutes, Yang Lin handed a stack of materials to Lu Chuan: "This Zhang Yan works in Anping Electronics Factory. She is raising a daughter by a single parent. There is also a paralyzed mother taking care of her at home. She is our registered helper."

Help object?

Lu Chuan did not expect that Zhang Yan's family background was so impoverished.

"I just contacted the electronics factory. Zhang Yan is still at work. Do you think we should go now or wait for her to get off work?"

After flipping through the materials, Lu Chuan thought for a while: "Now, let's go directly to the electronics factory."

10 minutes later, Anping Electronics Factory.

The workshop supervisor brought Lu Chuan and the two to the workshop: "Comrade police, the one standing next to the work station and wearing the blue overalls is Zhang Yan."

"Collect footprints first."

This is quite simple. Lu Chuan brought special footprint collection printing paper, and he only needs to stand on the printing paper for a short time to complete the footprint collection.

When Zhang Yan stood on the printing paper, Lu Chuan carefully observed the other party's expression, and could clearly see that the other party was nervous, his fingers were even trembling slightly, and his face was a little pale.

Sighing secretly, Lu Chuan picked up the collected footprints and directly compared them with the footprints found at the scene of the robbery.

Footprints, like fingerprints, are unique to each individual.

If the two footprints can match, it can be determined that Zhang Yan is the murderer.

"Police...comrade...you don't need to look...that person is me..."

When Lu Chuan was comparing, Zhang Yan behind him confessed in a trembling voice.

Criminal Investigation Detachment.

Qin Yong stared blankly at Liu Guodong who was reporting to him: "Say it again?"

Liu Guodong also looked confused: "Just now Lu Chuan called. He said that at the Huaguang Street Police Station, he and the police there caught the murderer of the robbery and wounding case last year."

(End of this chapter)