Yang Sen handed Liu Guodong a cigarette and took over the conversation: "Brother Liu is right, the deceased should have died of his homicide, and he is busy tonight." ”

Bai Wenhai stretched out his arms, stretched his waist, and took the cigarette handed over by Yang Sen: "Xiao Lu, you have just joined the work, and you have not accumulated enough experience, like this kind of murder scene, the less we find in the current investigation, the bigger the problem." ”

Bai Wenhai pointed to the evidence collection box in the carriage: "You see that we have been busy for a long time, and only a dozen fingerprints have been collected in the living room where the deceased died, and there is only one shoe print, I estimate that it should be the deceased's son." ”

"In the morning, he had entered the living room before reporting the crime, and naturally he would have left shoe prints, and if the deceased committed suicide, at least we would have collected the deceased's shoe prints."

Bai Wenhai took a puff of cigarette: "But the scene is very clean, and we didn't find the deceased's shoe prints, which means that someone should have deliberately erased the traces." ”

Yang Sen sighed: "The other party is very careful, and the traces are wiped very thoroughly......"

Lu Chuan listened quietly to the chat of the three seniors, this was the best time for him to learn and accumulate experience.

In school, Lu Chuan learned technology, such as how to collect fingerprints and blood, but what these things represent is not something that can be taught in school.

This needs to be accumulated by Lu Chuan himself, such as Bai Wenhai and Yang Sen, when they were doing the field survey, their methods were actually not professional, after all, they were all halfway monks.

But they were able to find something beyond the technology, and without even waiting for the autopsy report, they were almost certain that the deceased was not a suicide.

Back to the detachment, there is no hot meal in the canteen at all times, which is also part of the homicide mechanism.

In the words of Captain Qin Yong, the people on the front line are working hard, and they can't go back to the team without a hot meal.

3:15 p.m.

Lu Chuan and the four began to classify and identify the evidence collected at the scene, especially fingerprint comparison and DNA sample analysis, which is the key work.

Liu Guodong went to the case analysis meeting first, and Lu Chuan and the three of them were not qualified to attend the meeting, so they could only work in the laboratory.

Don't look at the fact that there are only four people in the current investigation office, but in the entire criminal investigation detachment, the richest department is the scene investigation.

Nothing else, the instrument is expensive.

A single DNA testing instrument can take down all the other departments.

This thing is also the lifeblood of the current investigation office, it was purchased only last year, and in the past, the criminal investigation detachment had to go to the technical identification department to do DNA identification, not to mention the queue, and sometimes it had to look at people's faces.

Yang Sen is responsible for operating the instruments, Bai Wenhai is responsible for sorting out the evidence, and Lu Chuan is responsible for combing the photos and writing the investigation report.

The investigation report is one of the most important components of the dossier, and writing the dossier is not the same as solving the case.

Solving a case can be done with logical reasoning, guessing, and suspicion.

The dossier is a statement of fact, with photographs, numbers, and texts detailing everything at the scene.

When Liu Guodong returned, it was already half past six, and thirteen hours had passed since the death of the deceased.

"Brother Liu, how is it going?"

Liu Guodong's expression was a little dark: "I made a detailed report on the current investigation, and from the analysis of the traces at the scene, it can be determined that he killed him." ”

"But the autopsy hasn't been completed yet, and there hasn't been much progress on the specifics."

Call......

The nature of the case was determined, and everyone's hearts were heavy.

"Okay, let's do our own thing and complete the on-site analysis report as soon as possible."

Solving a case is not based on passion, forensics, on-site investigations, and investigators do their own things well, and only by working together can they advance the investigation of the case.

In the No. 1 conference room, Qin Yong looked at the relationship chart on the whiteboard with a gloomy face.

The neighborhood where Zhang Wen's house is located is an old community, the surrounding facilities are outdated, and the few surveillance cameras that are there are also broken.

In addition, the community has no fence and is an open community, which brings great difficulties to the survey.

The interpersonal relationship with Zhang Wen has basically been clarified, the divorced wife is not in the city, and the second-married wife and the child brought by the other party went back to her mother's house in the next city the day before the crime.

The informant is the son of Zhang Wen and his ex-wife, who originally took Zhang Wen to the hospital for a physical examination in the morning, but did not answer after calling the door, and opened the door with the spare key under the foot mat, only to find that Zhang Wen was dead.

There are neighbors who can testify to this.

In addition, Zhang Wen's social background is simple and he has no enemies.

In the early hours of this morning, there was no unusual sound heard from the surrounding leaders.

Coupled with the fact that the murderer did not leave any traces at the scene of the crime, the detection of the case entered a dead end.

Qin Yong can only hope for the autopsy results now to see if there can be any valuable findings.

Survey Office.

Liu Guodong brought back the minced meat buns from the canteen: "Come, take a break, the canteen will make buns tonight, donkey meat filling, eat it while it's hot." ”

Lu Chuan and the three of them put down their work and came to the desk: "Master, has there been any progress in the case?" ”

Liu Guodong handed Lu Chuan three meat buns, he understood Lu Chuan's curiosity very well, he was more curious than Lu Chuan when he encountered the first murder case.

"The autopsy report has come out, and the cause of death is that the heart was pierced by a sharp weapon, but the wound has traces of repeated stabbing, which is consistent with the conclusion of our current investigation, he faked the suicide scene."

The so-called repeated stabbing is when the knife is stabbed in and then pulled out, and then stabbed in again.

Generally speaking, if a person has a strong will to commit suicide, he may not feel pain in a short period of time after self-harm, so it is possible to stab repeatedly in order to die quickly.

However, the heart knife is different from other parts, this kind of critical knife, the deceased will lose strength in an instant, and the possibility of repeated stabbing by himself is very small.

Lu Chuan nodded and did not continue to ask, the current survey has the scope of work of the current survey, and at this stage, in fact, their work has come to an end.

It can be heard from the conversation between Yang Sen and Lao Bai that the two do not plan to work overtime at night, and Yang Sen's child will definitely go home to see his child in the college entrance examination next year.

Lao Bai is fifty years old, and after a busy day, his physical strength can't support it, and he has been dozing off.

Lu Chuan is impossible, and is not qualified to ask the two seniors to work overtime.

But he also has systematic advanced tasks.

While there is no penalty for not completing the quest, there is certainly no reward.

Three times five divided by two to eliminate three donkey meat stuffed buns, Lu Chuan went to study the current survey data again.

Liu Guodong glanced at it and didn't speak, when he first joined the police, he also had such a momentum.

Young people are like this, just like if you don't know what prostate rebellion is all about if you don't know what it's like to be under a certain age.

Who hasn't had the feat of Shichijiro.

Thanks to the primary on-site survey and photography skills, Lu Chuan's on-site photos are classified and organized, and when he turns on the computer, Lu Chuan starts from the overview of the scene and does not let go of any detail.

The advanced task given by the system is: through on-site investigation, find clues to solve the case, and assist the task force to solve the case.

This shows that there must be clues about the investigation of the case at the scene, but Lu Chuan has not found it yet.

With a click of the mouse, Lu Chuan zoomed in on each photo and carefully watched the details.

Starting from the panoramic photos, to the close-up of the corpse, the details of the bloodstains, and even every item on the coffee table, the trash can in the corner, Lu Chuan did not let go of any of them.

But looking at each of the thousands of photos is not an easy task.

Liu Guodong and the others naturally discovered Lu Chuan's behavior, but they didn't interrupt him.

They are older, and they are not from professional classes, and their upward space is limited, and what they can teach Lu Chuan is the experience they have explored over the years.

Of course, it's not that they say that they can't be self-motivated, just like why the Empress Dowager Zhao fell in love with Chang Yu back then, good technology is one thing, and the key is to keep up with physical strength.

Liu Guodong and the three of them obviously have enough spare energy.

Lu Chuan, who had already seen more than 400 photos, twisted his stiff cervical spine and grabbed the cigarette case next to the computer, but did not find a cigarette.

Lu Chuan, who reacted, looked at the clock on the wall, it was already more than two o'clock in the morning.

No wonder a box of cigarettes has been wiped out, Lu Chuan has been watching it for more than seven hours.

Lao Bai and Yang Sen had already gone home, but Liu Guodong didn't leave, lying on the sofa in the office and snoring.

Lu Chuan walked over and covered Liu Guodong with a blanket, grabbed the cigarette on the desk, and lit it.

Taking a deep breath, the strong tobacco flavor made Lu Chuan's spirits slightly uplifted.

Flick your index finger and shake off a bit of soot.

Well?

Looking at the cigarette butts that were about to be piled up in the ashtray, a thunderbolt flashed in Lu Chuan's mind.

Cigarette butts?

Twisting out the cigarette, Lu Chuan ran to the computer, and the electric mouse quickly flipped the scene photos.

In a few moments, a photo appeared on the screen.