civil forensic

Chapter 35

afternoon.

Huang Qiangmin, the head of the criminal police team, walked around the fourth floor again.Mainly to the medical examiner's office for a conversation.

Lu Jianfeng, the squadron leader of the criminal squadron, accompanied him warmly.

Lu Jianfeng is also a criminal scientist who was born as a technical star.However, that was more than ten years ago.At that time, Lu Jianfeng, who was doing drug testing, established the first drug testing laboratory in Ningtai County, and cracked drug-related cases one after another, making many meritorious deeds.

However, as there have been fewer and fewer drug cases in recent years, the demand for chemical testing has never been high, and drug testing has almost become a medical examination post. Lu Jianfeng's focus of work has become more and more administrative.

Huang Qiangmin praised the recent performance of the criminal squadron, released a high-intensity smile, and focused on Jiang Yuan's "courage to do things".

In the county bureau, forensic medicine is a natural favorite, especially high-level trace inspection.

A high-level trace investigator can point directly at the murderer, which can save everyone a lot of travel and work.Improving the rate of solving crimes is not only the basis for meritorious service and awards, but also improves everyone's work completion.If it is a little bigger, it can also improve everyone's sense of identity with the job of the police.

Solving crimes has never been a simple job or task.

This point has not changed since ancient times.The special post allowance of [-] yuan per day has never been a reason to work overtime.

When this group of people dispersed, Wei Zhenguo came up smiling.

Wei Zhenguo brought someone over and said, "Mu Zhiyang, you met him before, let him follow you these two days, go to the police station, make an interrogation transcript, watch the video and so on, it's all right."

"That's great." Jiang Yuan couldn't really let an old criminal policeman follow him to find an electric car, and smiled at Mu Zhiyang, who was about the same age, and said, "The surname Mu is quite rare."

"There are not many in our local area. It is said that there was a minister named Li Mu in the Yellow Emperor. Later generations took the character as the surname, so it was passed down. I came from another place." Mu Zhiyang obviously introduced himself to others. surname.

Wei Zhenguo concluded from the side: "Young people who have been admitted from other places have simple social relations and are easy to do things. They have no family burden and can work overtime. They are educated and easy to handle cases. That is to say, Jiang Yuan, if you want people, others want them. I will not send Mu Zhiyang came here."

Jiang Yuan then expressed his thanks again, and said: "I have finished those few fingerprints, and I will ask Wang Zhong to send them to you later."

There are endless cases in the police station, and the task lists of various criminal police teams will never be cleared. Similarly, the fingerprint lists that everyone needs to do will never be cleared.

Different from the fingerprints of accumulated cases, each active case may involve a lot of fingerprints, most of which are not conclusive.

The policemen in charge of case detection hope to do as many fingerprint comparisons as possible, but the technical policemen of the criminal squadron may never be able to meet their expectations—even if it is a murder case, it is impossible to deal with all kinds of evidence infinitely and meticulously. Not to mention other cases.

Jiang Yuan didn't do a trace inspection, but he could pick up fingerprints and help Wei Zhenguo do a few more sets of fingerprints in advance, even if it was compensated by the six police teams.

After being sold for a good price, Mu Zhiyang happily followed Jiang Yuan, and watched the video in the office.

The video was copied by Jiang Yuan from the property, including the records of a total of 8 cameras in the last three months, and the total amount is huge.

Not to mention the criminal police, the people in the property are too lazy to watch these videos.

Mu Zhiyang and Jiang Yuan watched the videos from 4 cameras by themselves, and put them on the screen for fast replay, which made them feel dizzy very quickly.

for a long time.

"I found it. This is... it's Jiang Yongxin's electric car." Mu Zhiyang was more experienced, and while operating it, he finally got stuck at a certain point in time. After reading it again, he went back and paused: "It's a violent lockpicking of."

Jiang Yuan paused his video and turned to watch it.

I saw a man in a jacket walking along a row of electric cars, pretending to be on the phone, wandering around while choosing a car.

In about tens of seconds, he selected one of the electric cars, looked around, took it out of his pocket, got on the car, inserted it, twisted it vigorously, and the car started.

"Is this stealing?" Jiang Yuan was full of doubts.

Mu Zhiyang nodded, and said: "Violent unlocking is considered stealing, but it has no technical content. The key he holds is a master key. There are several kinds of master keys, including straight ones and cross-shaped ones. Is it right for him to find one? The tumbler lock with an idle lock cylinder, the master key is inserted in, twisted hard, the lock cylinder is screwed directly, and the car drives away."

"Can the lock cylinder be screwed?"

"This kind of lock cylinder is made of copper. His master key is made of steel, and some are made of alloy steel. As long as it is not a magnetic lock or an idle lock cylinder, it can be broken." Mu Zhiyang wrote on his notebook. After checking the record, he said again: "I didn't wear gloves, but I didn't touch anything other than electric vehicles."

"Good guy, you can call it clean and tidy." Jiang Yuan inspected the scene in the video with LV4 crime scene investigation, and couldn't find any omissions by the thief.

That's one of the reasons electric scooter thefts and the like are frowned upon.A thief who violently unlocks the lock knows that the technical content is not high after thinking about it, but the matter of stealing an electric car is so simple that he doesn't need to leave much information at all.

One of the basic principles of criminal investigation, Locard's principle says this: Whenever two objects touch, there will be a phenomenon of material transfer, that is, some things will be taken away, and some things will be left behind.

The one who stole the electric car is good, he touched the electric car, and then took the electric car away, leaving only footprints...

Footprints are not like fingerprints, they can be directly used to find criminals, they can only be used as evidence at best.Moreover, after such a long time, the footprints in public places must not be preserved.

If it weren't for the video recordings, this case would be harder to solve than a murder case based on the crime scene that Jiang Yuan saw. Even if there is no evidence at the murder scene, the motive can still be found through interpersonal relationships. That's how some homicides are solved.But the electric car theft, how could there be any human relationship involved...

Of course, as far as the case is concerned, it is impossible for the theft of electric vehicles to be as complicated as the murder case.The suspect's own vigilance is limited and his operational ability is limited, so he will appear in the video surveillance, which can also explain the problem in itself.

If you really want to chase this scene, there is no way out. Just follow the video surveillance on the day of the crime, and then find other video surveillance, and track all the way to the past. There is still a relatively high probability of finding clues.

If there is really no hope on the road, follow the place where the suspect lives, or the place where he may pass again, and then send someone to guard, or directly use the criminal police's big killer to investigate, after all, there is a possibility of finding the person.

However, these methods are not available to Jiang Yuan.

"Watch the next video." Jiang Yuan only thought for a short time before giving up the scene.

His goal is only to help recover a few electric vehicles, not all electric vehicles.

"Then let's continue watching the video." Mu Zhiyang took it for granted.He also helped people find things. It was easy and easy, and the troublesome thing was really troublesome.

According to the police records of the Jiangcun community, the two soon saw another electric car theft in broad daylight.The thieves were actually the same person, and they used similar methods. The only difference was that the other party also opened a U-shaped lock and threw it into a trash can not far away.

"Here." Jiang Yuan tapped with his hand, and immediately made a note.

"The video is from a month ago. I'm afraid I won't be able to find the lost U-shaped lock." Mu Zhiyang felt a little regretful, and said, "It's also a problem that the residents reported the crime late, and the police who came out to the police didn't pay attention to protecting the scene."

Jiang Yuan waved his hand, moved the surveillance video forward for a few seconds, pointed to the screen and said, "When he unlocked the U-shaped lock, he put his hand under the pillar."

The pillars are made of I-beams, and the position where the opponent's fingers are inserted is inward and downward, which is a place that ordinary people will not touch, so there is a greater probability of leaving fingerprints.

However, within a month, fingerprints have already entered a metaphysical state, and it is normal to leave fingerprints or not to leave fingerprints.

"In the past?" Mu Zhiyang asked.

"Don't worry, let's look at other things and sample together then."

"Do you want to ask the police from the local police station to go there first?"

"Don't." Jiang Yuan rebuffed straight away, "It's been too long, I'd better go and rest assured myself."

Mu Zhiyang had nothing to do with it, but he didn't think it was necessary.

(End of this chapter)