National Forensic Doctor

Afternoon.

Huang Qiangmin, the captain of the criminal police brigade, came to the fourth floor for a walk. The main thing was to go to the medical examiner's office and have a conversation.

Lu Jianfeng, the squadron leader of the Criminal Division Squadron, enthusiastically accompanied him.

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 successively solved drug-related cases and made 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. Drug testing has almost become a physical examination post. Lu Jianfeng's work focus has become more and more administrative.

Huang Qiangmin praised the recent performance of the Criminal Division Squadron, released a high-intensity smile, and focused on praising Jiang Yuan's "braveness to serve."

In the county bureau, forensic doctors are a natural talent, and high-level trace inspection is even more so.

A high-level trace inspector can point directly to the murderer, which can save everyone from traveling a lot and doing a lot less work. Improving the crime detection rate is not only the basis for meritorious service and receiving awards, but also improves everyone's work completion. If we say it louder, it can also increase everyone's recognition of the job of the police.

Solving crimes is never a simple job or task.

This point has not changed since ancient times. The special duty allowance of 100 yuan per day is never a reason to work overtime.

After the group of people dispersed, Wei Zhenguo came up with a smile.

Wei Zhenguo came over with someone and said: "Mu Zhiyang, you have met him before. Let him follow you for the next two days. Go to the police station, make an interrogation record, watch the video and so on. There will be no problem."

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

"There are not many in our area. It is said that the Yellow Emperor had a minister named Limu, and descendants took the surname as their surname, so it was passed down. I took the exam from outside." Mu Zhiyang obviously introduced himself to others. Surname.

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

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

The police station has endless cases, and the task lists of each criminal police team will never be cleared. Similarly, the fingerprint list that everyone needs to do will never be cleared.

Unlike fingerprints in backlogged cases, each current case may involve a large number of fingerprints, most of which are not conclusive.

The police officers responsible for investigating the case hope to conduct as many fingerprint comparisons as possible, but the technical policemen of the Criminal Division Squadron may never be able to meet their expectations - even for murder cases, it is impossible to handle all kinds of evidence in infinite detail. Not to mention other cases.

Jiang Yuan was not a fingerprint examiner. Instead, he could do it on his own and help Wei Zhenguo do a few more sets of fingerprints in advance, even if it was compensated by the police from the Sixth Team.

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

The video was copied by Jiang Yuan from the property management company. Including the past three months, there were a total of 8 camera records, which was a huge amount.

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

Mu Zhiyang and Jiang Yuan watched the videos from four cameras simultaneously and quickly played them on the screen. They quickly became dizzy.

for a long time.

"Found it, this is... Jiang Yongxin's electric car." Mu Zhiyang was more experienced and looked at it while operating. Finally, he got stuck at a point in time. He looked at it again, then came back and paused: "It's a violent lock pick. of."

Jiang Yuan paused his video and turned to watch.

I saw a man in a jacket walking along a row of electric vehicles, pretending to be on the phone, and wandering around while selecting vehicles.

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

"Is this stealing?" Jiang Yuan's face was filled with doubts.

Mu Zhiyang nodded and said: "Those who violently open locks are considered thefts, but they don't have any technical content. The key he took was a master key. There are several types of master keys, including straight-shaped and cross-shaped. He was looking for one that was not For a tumbler lock with an idling lock cylinder, insert the master key and twist it hard to break the lock cylinder, and the car will drive away.”

"Can the lock cylinder be twisted?"

"This kind of lock cylinder is all 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 idling lock cylinder, it can be broken." Mu Zhiyang wrote on his notebook After checking the record, he added: "I didn't wear gloves, but I didn't touch any place other than the electric vehicle."

"Good guy, you can call it clean and tidy." Jiang Yuan used LV4's crime scene investigation to review the scene in the video and could not find any omissions made by the thief.

This is one of the reasons why people don’t like electric car thefts. The thief who violently unlocks the door knows that his skills are not very high, but stealing an electric car is so simple that he does not need to leave much information at all.

One of the basic principles of criminal investigation, Lockard's principle says this: whenever two objects come into contact, material transfer will occur, that is, some things will be taken away and some things will be left behind.

What a good person to steal an electric car, he came into contact with the electric car, and then took the whole electric car away, leaving only footprints...

Footprints are not like fingerprints, which can be used directly to find criminals. At best, they can only be used for identification. Moreover, after such a long time, the footprints in public places cannot be preserved.

If it weren't for the video recording, just from the crime scene Jiang Yuan saw, this case would be harder to solve than the murder case - even if there is no evidence at the murder scene, the motive can still be found through interpersonal relationships. In fact, most of the cases Some murder cases are solved this way. But how could there be any interpersonal relationships involved in the theft of electric vehicles...

Of course, as a whole, the theft of electric vehicles is unlikely to be as complicated as the murder case. The suspect himself has limited vigilance and limited operational capabilities, and will appear in the video surveillance, which itself can explain the problem.

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

If there is really no hope on the road, go to the place where the suspect lives, or a place where he may pass by again, and then send people to stay guard, or directly use the criminal police's killing weapon to investigate, and there is a probability of finding the person.

However, none of these methods were available to Jiang Yuan.

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

His goal is just to help recover a few electric cars, not all electric cars.

"Then let's continue watching the video." Mu Zhiyang took it for granted. He has also helped people find things, whether it is easy or troublesome, it is really troublesome.

According to the alarm records of Jiangcun Community, the two soon saw another case of electric vehicle theft in broad daylight. The thief was actually the same person and used similar techniques. The only difference was that he also broke a U-shaped lock and threw it into a trash can not far away.

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

"The video was from a month ago. I'm afraid I won't be able to find the lost U-shaped lock." Mu Zhiyang said, a little regretfully: "The residents reported the crime late, and the police who dispatched the police did not pay attention to protecting the scene, which is also a problem."

Jiang Yuan waved his hand, played the surveillance video forward for a few seconds, pointed at the screen and said: "When he unlocked the U-shaped lock, he held the bottom of the pillar with his hand."

The pillar is made of I-beam steel, and the position where the opponent's fingers are inserted is closer to the inside and lower, which is a place that ordinary people do not usually touch, so there is a high probability of leaving fingerprints.

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

"Go now?" Mu Zhiyang asked.

"Don't worry, let's look at other things, and we'll take samples together when the time comes."

“Should we ask the police from the local police station to go there first?”

"No." Jiang Yuan refused and said, "It's been too long, so I'd better go there in person to rest assured."

Mu Zhiyang knew that he was capable, but he just felt that it was not necessary.