Chapter 35: Go Personally

Afternoon.

Criminal Police Brigade Captain Huang Qiangmin came to the fourth floor to stroll around again. Mainly to the forensic office to talk for a while.

Criminal Science Squadron Captain Lu Jianfeng accompanied him enthusiastically.

Lu Jianfeng was also a criminal science person who started as a technical star. However, that was more than ten years ago. At that time, Lu Jianfeng, who did drug testing, established the first drug testing laboratory in Ningtai County and successively solved drug-related cases, making meritorious service many times.

However, with fewer and fewer drug cases in recent years, the demand for chemical testing had always been low, and drug testing had almost been reduced to a physical examination post. Lu Jianfeng's work focus had also become more and more inclined to administration.

Huang Qiangmin praised the recent performance of the Criminal Science Squadron, released a high-intensity smile, and focused on praising Jiang Yuan's "courage to take responsibility."

In the county bureau, forensic doctors are natural sweet cakes, and high-level trace examiners are even more so.

A high-level trace examiner can point directly to the murderer, allowing everyone to run fewer roads and do less work. Improving case clearance rates and the like is not only the basis for meritorious service and awards but can also improve everyone's work completion. To put it bigger, it can also improve everyone's identification with the job of police.

Solving a case has never been a simple job or task.

This point has never changed from ancient times to the present. The daily special post allowance of over a hundred yuan has never been a reason for overtime.

After this wave of people dispersed, Wei Zhenguo drilled up with a smile.

Wei Zhenguo brought people over and said: "Mu Zhiyang, you've seen him before. Let him follow you for the next two days, run to the police station, take a questioning record, look at videos and such, it's all no problem."

"That's great." Jiang Yuan couldn't really let an old criminal policeman follow him to find an electric scooter, so he smiled at Mu Zhiyang, who was of similar age, and said: "The surname Mu is quite rare."

"It's not many in our local area either. It is said that the Yellow Emperor had a minister named Limu, and his descendants took the character as their surname, and it has been passed down like this. I took the exam from another place." Mu Zhiyang obviously hadn't introduced his surname to people less.

Wei Zhenguo summarized on the side: "Young people who took the exam from other places have simple social relationships and are easy to work with. No family burden, easy to work overtime. Educated, easy to handle cases. That is, Jiang Yuan, you want people; if others wanted them, I wouldn't have sent Mu Zhiyang over."

Jiang Yuan then expressed his gratitude again and said: "I've finished those fingerprints. I'll let Wang Zhong send them to you later."

The cases in the police station can never be finished, and the task lists of various criminal police teams can never be cleared. Similarly, the fingerprint lists that everyone needs to do can never be cleared either.

Unlike the fingerprints of accumulated cases, every current case may involve a very large number of fingerprints, most of which are not decisive.

The police responsible for solving cases hope to do as many fingerprint comparisons as possible, but the technical police of the Criminal Science Squadron may never be able to reach their expectations—even for homicides, it is impossible to process various evidence infinitely meticulously, let alone other cases.

Jiang Yuan is not a trace examiner, but he can pick fingerprints to do, helping Wei Zhenguo do more sets of fingerprints in advance, even if it is used as compensation for the police of the Sixth Squadron.

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

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

Let alone the criminal police, even the property management people were too lazy to watch these recordings.

Mu Zhiyang and Jiang Yuan each watched the videos of 4 cameras, put them on the screen at the same time and played them fast, and soon felt dizzy.

A long time later.

"Found it, this is... this is Jiang Yongxin's electric scooter." Mu Zhiyang was more experienced, operating while watching, and finally stuck to a time point, watched it once, and then reversed and paused: "It's a violent lock-picking."

Jiang Yuan paused the video on his side and turned to look.

I saw a man wearing a windbreaker walking along a row of electric scooters, pretending to be on the phone, while turning around and choosing a vehicle.

In about tens of seconds, he chose one of the electric scooters, looked left and right, took something out of his pocket, sat on the car, inserted it, twisted it hard, and the car started.

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

Mu Zhiyang nodded and said: "Violent lock-picking, it counts as stealing, but it has no technical content. The key he took is a master key. There are several types of master keys, one-character ones, cross-shaped ones, all of them. He finds a pin tumbler lock that is not an idling lock core, inserts the master key, twists it hard, directly twists the lock core, and the car is driven away."

"Can the lock core be twisted?"

"This kind of lock core is made of copper. His master key is made of steel, and some are even made of alloy steel. As long as it is not a magnetic lock and not an idling lock core, it can be twisted off." Mu Zhiyang made a record in his notebook and added: "No gloves, but no contact with places other than the electric scooter."

"Good guy, it can be called clean and neat." Jiang Yuan examined the scene in the video with LV4 crime scene investigation, and couldn't find any omissions by the thief.

This is also one of the reasons why electric scooter theft cases and the like are not liked. Thinking about the violent lock-picking thief, one knows that the technical content is not high, but the act of stealing an electric scooter itself is too simple, so he doesn't need to leave much information at all.

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

The one stealing the electric scooter is good; he just contacts the electric scooter, and then takes the whole electric scooter away. What is left is only footprints...

Footprints are not like fingerprints, which can be directly used to find the criminal; they can only be used for identification at most. Moreover, after such a long time, footprints in public places definitely cannot be preserved.

If it weren't for the video recording, just looking at the crime scene Jiang Yuan saw, this case is harder to solve than a homicide case—even if there is no evidence at the homicide scene, one can find motives through interpersonal relationships. In fact, most homicide cases are solved this way. But electric scooter theft, how can there be any interpersonal relationships involved...

Of course, in terms of the case as a whole, stealing an electric scooter cannot be as complex as a homicide case. The suspect's own vigilance is limited, and his operational ability is limited. Appearing in video surveillance itself can also explain the problem.

If one really wants to follow this scene, it is not that there is no way. Just follow the video surveillance on the day of the case, find other video surveillance, and track it all the way, there is still a relatively high probability of finding clues.

If there is really no hope on the road, follow it to where the suspect lives, or where he may pass again, and then send people to stake out, or directly adopt the criminal police's big killer—investigation, the probability of finding the person is ultimately there.

However, these methods are not what Jiang Yuan can use.

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

His goal is just to help find back a few electric scooters, not to find back all electric scooters.

"Then we'll continue watching the recording." Mu Zhiyang was accustomed to it. He had also helped people find things; easy ones are easy, and troublesome ones are really troublesome.

According to the police report of Jiang Village residential area, the two soon saw another electric scooter theft case in broad daylight. The thief was actually the same person, and the method used was similar. The only difference was that the other party also poked open a U-lock and threw it into a trash can not far away.

"Here." Jiang Yuan pointed with his hand and immediately made a record.

"The video is also from a month ago. I'm afraid the lost U-lock can't be found back." Mu Zhiyang was a little sorry and said: "Residents report to the police late, and the police officers who go to the scene don't pay attention to protecting the scene, which is also a problem."

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

The pillar is made of I-beam, and the position where the other party's fingers buckled is inward and downward, which is a place that ordinary people usually won't touch, so there is a high probability of leaving fingerprints.

However, for a month, for fingerprints, it has already entered a metaphysical state. It is normal to leave fingerprints or not leave fingerprints.

"Go now?" Mu Zhiyang asked.

"Don't be in a hurry, look at others, and sample them together later."

"Do you want to ask the police officers of the local police station to go first?"

"Don't." Jiang Yuan refused immediately and said: "The time is too long, it's better for me to go personally."

Mu Zhiyang had no objection, but felt it was unnecessary. ===== CHAPTER 36 =====