Chapter 762: End of the Re-Inspection

Ma Rongcheng looked at the angle and light he adjusted with satisfaction. The shoe prints on the ground looked messy to others, but with his decades of experience and skills, everything was very obvious and simple.

I don’t know if it’s because the butt determines the head. After working on the traces for a long time, Ma Rongcheng is more concerned about his restoration of the scene and the extraction of evidence. As for whether the case can be solved in the end, he doesn’t care so much.

I don’t know what happened today. I was a little excited by the three young people. The spirit was pushed to the top of my head.

It feels a bit like being rushed to the shelves, but it’s pretty good.

Look, it’s another perfect shoe print extraction, and a second person who was originally hidden behind the scenes was found, which is considered a little achievement.

Chen Shu coughed a few times, interrupting Ma Rongcheng who was wandering for a while.

He decided to deal with the problem from a different angle. The shoe prints as evidence can bring everyone a new idea, but it is still a little weak to determine the direction of the case.

"It's best to have fingerprints." Chen Shu coughed a few more times, trying to draw Ma Rongcheng's attention back to the scene in a tactful way.

He said in a deep voice: "Expert Ma, see if you can extract fingerprints from the hanging rope, the window handles and the countertops, and then the door frame and light switch where the deceased was hung in the bathroom are all places you can try."

"Scanning fingerprints in the hotel room? This is a lot of work. But it's okay, give it a try." Ma Rongcheng agreed.

The other party mentioned all the skills he is best at. To be honest, it can be done in about the time it takes to drink a sip of water.

Before getting started, Ma Rongcheng brought out some of his previous experiences about fingerprints and talked to Jiang Hai.

Ma Rongcheng liked this tall and strong police academy student and was willing to share his experiences and experience with him.

He had seen a very ruthless guy more than ten years ago. In order to make things easier, he directly wiped his fingerprints with sulfuric acid. That was not only painful, but it was also possible to destroy his hands by accident.

However, even though the other party was caught by the police, he was quite proud, saying that according to his method, the fingerprints processed were also very good.

Since then, everything has been convenient and no one is afraid of doing anything.

"But he still sat on our tiger bench in the end." Ma Rongcheng smiled proudly with his mouth hooked, and that case must be his masterpiece. "Don't underestimate modern technology, and don't simply think that modern crime solving is still in the era of DNA and fingerprints, such as trace substances."

"Teacher Ma, I learned this in the police academy!" The young man still had a strong desire to perform, and said quickly, "Locard's law of material exchange! When the surfaces of two objects contact each other during movement, there will always be a conversion of trace substances, that is, the trace substances on the surface of one object will be transferred to the surface of another object."

"That's about it." Ma Rongcheng was as harmonious as an old man, without any anger at being interrupted when he was talking, and smiled at the police cadet who vaguely looked like him in the past.

Jiang Hai imitated the teacher on the podium and said with longing: "There is no perfect crime, only undiscovered clues."

"Haha." As expected, Chen Chuan poured a basin of cold water, "So, there is no case that cannot be solved, only..."

When Jiang Hai and others looked over, Chen Chuan smiled and said: "Police that can't solve the case. Haha, does it make sense?"

Jiang Hai was speechless for a moment, thinking about how this senior brother who was much older than him was still so naive.

Ma Rongcheng lost interest in chatting, hummed and continued to tinker with the work at hand.

However, after hearing their conversation, Chen Shu unexpectedly caught the point they had missed before: Locard's material exchange law, that is, the curtain cloth and the grass downstairs must have an intersection. If this intersection can be determined, then the case may be solved in one fell swoop.

Curtain cloth.

Mud and grass.

Upstairs

Downstairs

Ma Rongcheng turned on the light, shook it at the windowsill a few times, blew a breath on it, took out a magnifying glass and looked at it for a while, then took out powder, pipes, smoke, chemical reagents, etc. and tried them one by one.

Under the expectant gaze of several people, Ma shook his head and said regretfully: "No fingerprints, too clean."

Chen Shu nodded, no surprise.

Since it is a murder case, even the shoe prints are known to be forged to look like the victim, so the suspect will definitely erase other traces of his existence at the crime scene, and fingerprints are naturally the first.

However, there are no fingerprints on the windowsill, which just seems to be a cover-up.

As a hotel room for accommodation, there will always be someone opening and closing the windows when guests come and go, and the cleaning lady cannot wipe the windows when cleaning the room, so there will be more or less fingerprints on it.

Especially this kind of stainless steel, it is easy to leave fingerprints, but the result is that there is no trace of it at all, it is hard not to suspect whether someone deliberately cleared the traces on the window.

Jiang Hai came over and fiddled with the window handle with his rubber-gloved hands, whispering, "Brother Shu, since the window is locked, how did the suspect get out of the room?"

"There must be some tricks to murder in a closed room. As long as we can understand this, the case will be solved. Let me think about it, is it possible that the person is hiding under the bed, and will crawl out and leave after we leave?" Chen Chuan, who had just finished watching a few episodes of detective anime, actually made a similar suggestion.

Chen Shu bent down, lifted the big bed directly, looked under the dusty bed for a few times, and shook his head: "It's all dust, it's impossible to hide here."

"Then"

Except for the sound of Ma Rongcheng taking pictures, there was no other sound in the room.

"Officer, there is something downstairs, how about I leave first?" Standing at the door of the room, the hotel staff who was supposed to be investigating the witness asked for leave after receiving a phone call and left.

Chen Shu watched the staff leave, thought for a moment, and said, "How about this, Jiang Hai and Chen Chuan continue to stay here to cooperate with Ma's work, I will go back to the Criminal Investigation Team to check the video surveillance."

"There should be nothing to do here, right? Brother Shu, how about I go back to the team with you. I have taken a video investigation course, I should be able to help!" Jiang Hai just thought that the on-site investigation was boring, it was more fun to follow Brother Shu.

Chen Shu glanced at Ma Rongcheng who was using a cotton swab to wipe the teacup meticulously, turned to Jiang Hai and said, "This is a rare opportunity. You can learn a lot of practical things by following Ma's expert. I can handle the video investigation alone."

Jiang Hai is still a student and has little experience, but Ma Rongcheng's operation method is extremely strong in Chen Shu's opinion. This kind of on-site investigation involving murder cases uses extremely complex techniques and means.

If it were an ordinary case, it would be almost impossible for Ma Rongcheng to operate like this.

Grassroots police officers like Chen Shu are busy with handling cases and on duty on weekdays. In fact, they rarely have time to study and further their studies. They rely on their own daily accumulation and experience, so there are great limitations.

If Chen Shu had not had a mission, he would have stayed with the expert Ma in time to learn a few tricks.

If the expert reveals a few tricks of this kind of on-site investigation skills, the police who learn it can really use it for a lifetime.

Chen Chuan immediately understood what Chen Shu meant, stepped forward and hugged Jiang Hai, dragged out his voice, and said: "Xiao Hai, this opportunity is rare, don't miss it."

Jiang Hai slapped his head and understood.