The room sat north and faced south, and it was nine o'clock in the morning, and the sunlight poured into the living room, reflecting on the pale face of the deceased, which was somewhat infiltrating.

"Xiao Lu, the gloves should be put on three layers."

Lu Chuan nodded, this detail Lu Chuan is clear, wearing two more layers of gloves is not to protect the scene, but to protect himself.

Any crime scene, especially a murder scene, has mostly blood sprayed out, and you never know what's inside the bloodstains at the scene.

There has been a precedent for a criminal police officer who was infected with a highly deadly immune system disease by blood stains at the scene of the murder.

Lu Chuan put on shoe covers, put on a mask and gloves, first squatted down and looked at the ground in the direction of the sun, and then tiptoed to the northwest corner of the balcony.

He casually took out a red millimeter ruler from the survey box and put it on the edge of the sofa, Lu Chuan lifted the camera to focus in the corner, and began to take a full picture of the whole scene.

Although Liu Guodong has started work, he has been paying close attention to Lu Chuan's performance.

In Liu Guodong's eyes, although Lu Chuan was born in a professional class, he was diligent and sharp, and he arrested a wanted criminal half a month ago, but this was Lu Chuan's first appearance on the scene after all.

He was not afraid that Lu Chuan would not take good pictures, but he was mainly afraid that Lu Chuan would accidentally destroy the scene.

The most important thing for the criminal police is not how careful thinking and shrewd brains they are, but to be cautious.

I am not afraid that no clues to solve the case will be found at the scene, and I am afraid that the traces of the scene will be destroyed.

And some traces are destroyed and never have a chance to be repaired.

But the three details that Lu Chuan just showed made Liu Guodong's eyes shine.

The first is Lu Chuan's action of squatting down to face the sun and looking at the ground, which is a small skill that Lao Xiankan has mastered.

Under the strong light, the traces on the ground, especially the footprints, will be easily found, so that the observation in advance can avoid the footprints or other small traces from being destroyed by the criminal police during the investigation.

In some dimly lit crime scenes, the criminal police will even use a strong flashlight to irradiate the ground to determine the route of the scene investigation.

Although this technique is simple, it is very practical, it is all passed on by word of mouth, the police academy will not teach this kind of thing, where did Lu Chuan learn it?

If this small detail may have been learned by Lu Chuan from somewhere, the second detail made Liu Guodong a little moved.

Stations!

Lu Chuan's chosen position to take pictures is the southwest corner of the balcony.

Generally speaking, it can be divided into three levels: overview, key parts and details.

First of all, the overview photo of the crime scene should be as panoramic as possible, which is why the camera is required to be equipped with a wide-angle lens in the current survey and photo process.

The panoramic overview photos should take into account various factors such as the topography and light of the scene.

Lu Chuan's choice of this station is very ingenious, judging from the sunlight scheduling of the scene, only the balcony is backlit, and the southwest corner is facing the corpse, which can show the corpse to the greatest extent.

In the current investigation and photography of the murder scene, the corpse is of course the biggest subject.

Lu Chuan was able to choose the best spot for this panoramic shot just by observing a circle, which is not a skill but an ability.

The third detail is the red millimeter ruler that Lu Chuan took out of the survey box.

There must be a reference object for on-site survey shooting, and the selection of millimeter rulers for panoramic photos of the crime scene is a standardized process, but the problem is that the millimeter ruler prepared by Liu Guodong in the on-site survey box has three colors, transparent, color and red.

The current light intensity is a red millimeter ruler, which allows for maximum clarity and strong color contrast.

Under what light, what color of millimeter ruler to choose, this is not a skill, nor a standardized process, but work experience.

Lu...... Did you get this ruler by chance?

No!

If there were no previous two details, Liu Guodong would definitely think that it was a coincidence.

After taking a closer look at Lu Chuan, who was setting up a tripod, Liu Guodong retracted his gaze and secretly said that he had picked up a treasure this time.

The work of the on-site survey is tedious and meticulous, and the workload is also very large.

Liu Guodong and Lu Chuan had to number and take pictures of all the physical evidence at the scene, and then they had to take macro shots of some details.

Lu Chuan's basic skills are very solid, numbering, recording, and taking pictures are well organized, and Liu Guodong's worries from the beginning have gradually relaxed.

Later, when Yang Sen and Bai Wenhai from the current survey room arrived, it was even more relaxed.

Fingerprint extraction, footprint rubbing, hair, blood, dander and other small physical evidence are all being extracted in an orderly manner.

"Xiao Lu, the extraction of blood can't directly put the cotton swab into the evidence bag."

While sorting out the work at hand, Liu Guodong also took the opportunity to teach Lu Chuan some experience of the current investigation: "It is necessary to fold absorbent paper into a funnel shape to wrap the cotton swab, and then collect it into the evidence bag." ”

Lu Chuan, who was in charge of taking pictures, nodded frequently, no one taught him these scene details when he was in the police academy, and the system only gave him a primary field survey and photography skills, and other experiences needed to be learned and accumulated by Lu Chuan himself.

When Lu Chuan and the four of them carried out the on-site investigation, other criminal police officers had already confirmed the identity of the deceased, and the surrounding people were also visiting and investigating.

In homicide cases, the most important thing is to determine the identity of the deceased, which involves investigating the social background of the deceased, sorting out the network, and screening the suspect.

The entire murder scene was busy, Lu Chuan and the four were doing scene investigations, and two forensic doctors were doing a preliminary autopsy on the corpse.

Lu Chuan's photo shoot also went to the final step, taking macro shots of all the details.

"How's it going?"

At 9:28, the top leader and the leader in charge of the Haizhou City Public Security Bureau arrived at the scene, and Qin Yong was making a report on the case.

In addition to large-scale meetings, grassroots police officers can only have access to the top management of the Haizhou Public Security Bureau at the scene of major crimes.

"Song Bureau, Wang Bureau, the identity of the deceased has been preliminarily confirmed."

"The deceased Zhang Wen, male, 63 years old, from Haizhou City, died at 3 o'clock in the morning today, and the cause of death was preliminarily determined to be a sharp weapon piercing the heart to death."

"The informant is the son of the deceased, and judging from the circumstances at the scene, the deceased held the handle of the knife in his right hand and was lying on his back on the sofa, suspected of committing suicide."

The two bureau chiefs relaxed when they didn't hear about the suicide, both of them were front-line police officers, and they were old criminal investigators themselves, and they had seen a lot of such things as falsifying the scene.

"Okay, if it's determined to be a suicide, follow the procedure."

Song Jiangguo didn't say what to do if it wasn't suicide, and Qin Yong didn't ask.

Click.

After Lu Chuan took the last vertical photo of the corpse, his work was completed.

"The basic task, carry out an excellent on-site survey and photo task to complete."

First look at the photo from far to near, from the overview to the details, there is a certain process, when Lu Chuan pressed the shutter for the last time, the prompt of the system to complete the task sounded.

2:28 p.m.

The body has been carried away for further autopsy to finalize the cause of death.

The on-site survey work of Lu Chuan and others has also been completed.

Haizhou City is a key city in the province, with a population of more than 5 million and a relatively developed economy, so the strength of the criminal investigation detachment of the Haizhou City Public Security Bureau is also in the forefront of the province.

The relevant equipment and instruments cannot be said to be top-notch, but they are also standard.

has its own professional investigation tool car, four professional investigation criminal police, don't underestimate these people, in the general criminal investigation detachment, there is no full-time investigation criminal police establishment.

They are all front-line investigators who work part-time, of course, once they are part-time, there is no way to be too strict about the level of work.

"Xiao Lu, pack your things and get ready to go back to the team."

Liu Guodong is nearly fifty years old, and his physical strength is no longer at the peak, and he has been busy at the scene for more than five hours, with a sore back and a tired face.

The same is true for Yang Sen and Bai Wenhai, anyone who squats in a small space all morning will also be tired.

It was Lu Chuan, because it was the first time he went to the scene, and he had the system's rewarded on-site survey and photography skills to practice, and even now he is quite interested.

On the way back to the detachment, Lu Chuan's part-time driver: "Master, can the deceased be sure that it was a suicide?" ”

They found very few clues at the scene, no footprints, no fingerprints, and even dander and hair contained less than twenty evidence bags.

Liu Guodong's hands pressing his temples paused slightly, and he opened his eyes a little tiredly: "It is unlikely that suicide will be committed, and the scene should be carefully disguised." ”