The eight surveillance cameras in Jiangcun community cover the entrance and exit, as well as two parking lots for electric cars, one inside with a canopy and one outside on the street, both of which do not affect the enthusiasm of the thieves.

After watching the surveillance video for a long time, Mu Zhiyang and Jiang Yuan found that there were only three people who came to steal electric bikes. One of them was a man in his twenties who wore a bulletproof vest and might have left fingerprints under the I-beam. He basically used a universal key to forcibly open the lock. After coming a few times, he never came again, probably because he was afraid of being recognized by security guards or something.

The other two were more violent and came twice in total. They drove an electric tricycle over at night, parked it next to the outdoor electric car parking lot, and if they found unlocked electric cars, they would cut the fuse next to the battery, then use a magnet to stick to the horn to solve the alarm and then take the car away. For locked electric cars, they used hydraulic pliers to cut the chain lock or U-lock, then put them on the tricycle and stole multiple electric cars at once.

Jiangcun community is located on the outskirts of the county town. The county government is located on the south bank, which is relatively prosperous, while the north bank is some newly built residential areas and streets with incomplete supporting facilities. When the suspects stole electric cars, they could easily leave the city by turning a few corners, and there was nowhere to be found.

"It's all so unskilled." Jiang Yuan finished watching the surveillance video and then took a picture of the scene where the moving group threw cigarette butts and garbage into the roadside drainage ditch with his phone. He couldn't help but comment.

He used to imagine or think that at least some lock-picking skills were needed to open an electric car, but neither group showed any such skills.

Moreover, in terms of efficiency and practicality, the methods used by these two groups were even better than using lock-picking. Because lock-picking skills always take some time, even the fastest lock-picking is no faster than the violent method used by the first group, which turns twice and opens. If the speed of lock-picking is slower, it may arouse suspicion.

Mu Zhiyang leisurely said, "If they can steal electric cars, what kind of skills do they need? There are even worse ones who don't even know how to use violence to open locks. They just wander around on the street, waiting for someone to forget to take out their electric car keys and then immediately take the car away..."

"What if they don't encounter an electric car with the key left in it?"

"Go home and make some noodles, and continue playing with their phones." Mu Zhiyang shrugged and said, "There are even more advanced ones who specialize in stealing batteries and electric bike batteries. These three people still have some pursuit?"

"Exactly. These two are using hydraulic pliers. Look closely, they always cut the lock head first. Why? Because the lock fork can be made hard, but the lock head has a complex shape and cannot be too hard. If it's too hard, it cannot be processed or it will be too expensive. That's what it means..." Mu Zhiyang was also relaying what he heard, but he explained it clearly.

When it comes to anti-theft, it ultimately depends on the cost-effectiveness.

A U-lock that costs 20 yuan can only prevent passersby, but it cannot prevent violent opening by someone wearing a bulletproof vest. A U-lock that costs 60 yuan can generally prevent someone wearing a bulletproof vest if it is locked in the correct position, but it cannot prevent someone using hydraulic pliers to break it.

The alarm system that comes with electric bikes is the same. An alarm with a built-in power source is more practical than one that is connected to the battery. An alarm with two speakers is more troublesome than one with one speaker. However, no matter how good the anti-theft system is, it is afraid of encountering the right person, especially standardized anti-theft systems. They are like "example problems" in textbooks. No matter how difficult the example problem is, it can only prevent those who don't study hard, but it cannot prevent those who are smart and eager to learn.

The best anti-theft mode for electric bikes is for the owner to make some personalized changes to their own anti-theft system. It doesn't need to be an improvement or enhancement, just a slight change in position or mode, and the success rate of anti-theft will be greatly improved. It's like slightly modifying an example problem in a textbook, changing the numbers, and it's enough to block those students who haven't studied seriously or who are not smart and eager to learn.

However, if someone has resorted to stealing electric bikes, their level of seriousness and eagerness to learn is probably not that high. Just by looking at the clues they left behind, it's clear that even a child who can score 120 points in math cannot be so careless when doing even the worst problems.

Jiang Yuan and Mu Zhiyang each rode an electric bike and went to the police station near Jiangcun community to report.

After some communication from Comrade Mu Zhiyang, the two of them successfully obtained a police auxiliary to accompany them.

Although the police auxiliary has the word "auxiliary" in their title, in the current grassroots judicial system, they do everything and can do any job. Zhou Ta, who wears a police badge with "FJ" at the beginning and is over 40 years old, has 15 years of experience in law enforcement.

The police station near Jiangcun community was afraid that Jiang Yuan and Mu Zhiyang, two young people, would not be sensible, so they sent Zhou Ta to accompany them.

Compared with ordinary police officers, Zhou Ta has good communication skills. After walking for a while, he became familiar with Jiang Yuan and Mu Zhiyang and said, "I often do on-site investigations. Actually, if it's just fingerprint scanning, you can tell us and we can come over and do it. You don't have to come specifically..."

"I want to do it myself." Jiang Yuan explained politely, "The fingerprint on the steel bar has been there for a month. I don't know if it can still be scanned."As soon as Zhou Tayi heard this, he immediately stopped the topic and said, "Actually, you don't necessarily have to dust for fingerprints. You can ask around on the street and maybe find someone. These thieves who steal electric bikes for food don't have much of a trace. If you're willing to put in some effort, someone will eventually confess."

"Let's try that next time." Jiang Yuan was only helping his relatives find their stolen electric bike, and it was already a hassle to ask Mu Zhiyang and Zhou Tayi to run an errand. There was no need to owe anyone any favors.

Besides, Jiang Yuan didn't understand the situation on the street, and owing someone a favor for it could lead to complications.

With a few words, Zhou Tayi confirmed Jiang Yuan's attitude and happily entered the chatting environment. He patrolled the area every day and knew which restaurant had clean food and which supermarket had rats. It was quite interesting.

When they arrived at the scene, Zhou Tayi, wearing his duty uniform, was very enthusiastic about taking notes, while Mu Zhiyang crouched down in front of the steel beam with Jiang Yuan and asked, "Can you still see any fingerprints?"

"You can use a magnifying glass or ultraviolet light to see." Jiang Yuan opened his forensic kit and said casually, "We don't need to do that today. We can just dust for prints."

As he spoke, Jiang Yuan took out a bottle of gold powder from several bottles of gold, silver, black, grey, and white and a furry, black brush.

After looking at the position of the photographed print again, Jiang Yuan dipped the brush in the gold powder and lightly tapped the handle, causing the 400-mesh copper powder to fall finely onto the relatively flat steel surface.

From Mu Zhiyang's perspective, Jiang Yuan's tapping was particularly uniform, and with his prelude, it was quite ceremonial.

"Technicians are really different. You're quite particular about this. We usually use silver powder." As a criminal investigator, Mu Zhiyang also had to dust for fingerprints when he arrived at a crime scene. For some small cases, it was easier to do it himself than to ask the Criminal Investigation Department to come over.

Jiang Yuan observed the surface of the steel and said, "Silver powder has strong adhesion and is suitable for many occasions. It's considered a universal powder. But today's background is too light, so gold powder provides better contrast."

"Your brush seems different too."

"It's pure grey squirrel hair. It costs over 200 yuan each, and I specially ordered it."

"This brush costs over 200 yuan?" Mu Zhiyang was amazed.

"Grey squirrel hair is known as the Hermès of brush hair. Look at the tip, it's thin and straight, and it's soft and doesn't easily damage fingerprints."

"Is this really Hermès?"

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"Because grey squirrel hair is also the best in makeup brushes for women. It's comfortable to brush fingerprints with it, and it's comfortable for women's faces to be brushed with it." Jiang Yuan added, "It's the best match with gold powder."Jiang Yuan spoke and leaned down, holding his right hand steady. With the sharp tip of a gray mouse hair brush, he gently brushed away the gold dust on the surface of the steel plate, as if applying eyeshadow to a beautiful woman.

As the excess gold dust scattered, a few incomplete fingerprints appeared before them.