Police Chen Shu

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 technology, everything was obvious and quite 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 was more concerned about his restoration of the scene and extraction of evidence. As for whether the case could be solved in the end, he didn’t care so much.

I don’t know what happened today, but after being encouraged by these three young men, I got a little excited and pushed my forehead vigorously.

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

No, this is another perfect extraction of shoe prints, and a second person who was originally hidden behind the scenes was created, which is a bit of an achievement.

Chen Shu coughed a few times, interrupting Ma Rongcheng's wandering mind for a moment.

He decided to deal with the problem from a different angle. The shoe prints could be used as evidence to give everyone a new idea, but when it came to deciding the direction of the case, its intensity was still a little low.

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

He said solemnly: "Expert Ma, see if you can extract fingerprints from the hanging rope, window handles and countertops. Then the door frame and light switch of the toilet where the deceased was hung are all places you can try."

"Scan fingerprints in a hotel room? It's a lot of work. But it's okay, let's give it a try." Ma Rongcheng agreed.

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

Before getting started, Ma Rongcheng brought up some of his previous knowledge about fingerprints and chatted with Jiang Hai.

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

More than ten years ago, he met a very ruthless guy who wiped his fingerprints with sulfuric acid to make things easier. Not only would it hurt, it would also be possible to accidentally destroy your hand.

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

Since then, everything has been convenient and I am no longer afraid of anything.

"But he still sat on our tiger bench in the end." Ma Rongcheng raised the corners of his mouth and smiled proudly. Presumably that case was also his proud work. "Don't underestimate modern technology, and don't simply think that modern technology is modern." Solving crimes 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 express himself and said quickly, "Locard's Law of Matter Exchange! When the surfaces of two objects contact each other during motion, there will always be The transformation of trace substances occurs, that is, trace substances on the surface of one object are transferred to the surface of another object.”

"That's almost it." Ma Rongcheng was as harmonious as an old man. He didn't feel annoyed at being interrupted when he was talking. He smiled and looked at the school policeman who vaguely remembered his appearance back then.

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

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

When Jiang Hai and others turned their attention, Chen Chuan smiled and said, "The police can't solve the case. Haha, does that make sense?"

Jiang Hai was speechless for a moment, wondering why this senior brother who was many years older than him was still so childish.

Ma Rongcheng lost interest in chatting and hummed and continued to work on the drums.

However, after hearing their conversation, Chen Shu accidentally caught what they had missed before: Locar's law of material exchange, which means that there must be an intersection between the curtain cloth and the grass downstairs. If this intersection can be determined Come down, then the case may be solved in one fell swoop.

curtain.

Mud meadow.

upstairs

downstairs

Ma Rongcheng turned on the light, swung it against the window sill a few times, breathed upward, took out a pair of magnifying glasses and looked at it for a moment, and then used magic tricks to take out powders, pipes, smoke, chemical reagents, etc. to try one by one.

Under the expectant attention of several people, Expert Ma shook his head and said regretfully: "There are no fingerprints, it's too clean."

Chen Shu nodded, no surprise.

Since it was a murder case, and even the shoe prints were forged to look like the victim's, the suspect would definitely erase other traces of his existence at the crime scene, and fingerprints would naturally be the first priority.

However, there were no fingerprints at all on the window sill, which just made it look like there was no three hundred taels of silver in this place.

As a hotel room for accommodation, someone will always open and close the windows when guests come and go, and the cleaning lady cannot wipe the windows when cleaning the room, so there will be a lot of fingerprints on them.

Especially this kind of stainless steel, it is easy to leave fingerprints. As a result, no trace was found. It is difficult not to make people wonder whether someone deliberately removed the traces on the window.

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

"There must be some skill in secret room murder. As long as we can understand this thing, the case will naturally be solved. Let me think about it, is it possible that the person is hiding under the bed, and when we leave, he will crawl out Leave?" Chen Chuan, who had just watched a few episodes of a detective anime, actually expressed his opinion similarly.

Chen Shu bent down, lifted up the big bed, looked under the dusty bed a few times, and shook his head: "It's all dust, there's no way you can hide here."

"That"

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

"Officer, there's something going on downstairs. How about I leave first?" The hotel staff, who was standing at the door of the room and was considered a witness to the inquest, took a leave of absence and left after receiving a phone call.

Chen Shu watched the staff leave, thought for a while, and said, "Let's do this. Jiang Hai and Chen Chuan will continue to stay here to cooperate with Expert Ma's work. I will go back to the Criminal Investigation Brigade and take a look at the video surveillance."

"Is everything going to be okay here? Brother Shu, how about I go back to the brigade with you? I have taken a video investigation course, which should be able to help!" Jiang Hai only thought that the on-site inspection was too boring, so it was more fun to follow Brother Shu.

Chen Shu glanced at Ma Rongcheng, who was meticulously wiping the tea cup with a cotton swab, and turned to Jiang Hai and said: "This is a rare opportunity. You can learn a lot of practical things by following Expert Ma. I'm over there with the video investigation." One person can do it.”

Jiang Hai was still a student and didn't have much knowledge, but Ma Rongcheng's operating techniques were extremely powerful in Chen Shu's opinion. The techniques and methods used in this kind of on-site investigation involving murder cases are also extremely complex.

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

Grassroots police officers like Chen Shu are busy 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 hadn't been on a mission and wanted to help Huang Mao solve the murder case as much as possible, he would have stayed with the horse expert in time to really learn a few tricks.

This kind of on-the-spot investigation technique can be mastered by experts a little bit, and the police officers can really use it for a lifetime.

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

Jiang Hai patted his head and understood. (End of chapter)