Mu Zhiyang also leaned down, carefully examining the fingerprints.

The incomplete fingerprints were mainly focused on the fingertip position, with the middle part not fully pressed and the overall area not very large.

"Is it too long ago?" Mu Zhiyang was a bit disappointed. The brush used was a 200-yuan one, and it was brushed with expensive copper powder, but still, no complete fingerprint was brushed out.

Jiang Yuan first took out his camera and took clear photos as possible. Then he stood up and looked directly at the fingerprint pattern captured in the photos, saying slowly, "It's incomplete, but we should be able to match more than ten characteristic points."

Mu Zhiyang tiptoed to look at the fingerprint and was quite surprised, "This shape is not complete, and the lines are blurry. Can we still find more than ten characteristic points?"

"You should take a look at the fingerprints from the arson case I did a few days ago." Jiang Yuan leaned down again and took several fingerprint photos before starting to take photos of the scene.

Mu Zhiyang slapped his forehead, "My associative ability... sigh, it's only you. If someone else were here, this case would be really difficult to solve."

If the same fingerprints were taken by the local forensic team, the trace examination team would definitely pretend to be disdainful. Otherwise, what could they do? Even if the fingerprint was more complete, they probably wouldn't want to do it.

Complete fingerprints can be matched with a simple comparison, but incomplete fingerprints are more troublesome. If it's as incomplete as the arson case, it's not just troublesome, but it may also consume the energy of expert-level trace examination...

For a case solved by burning out the brains of a genius, if it's just a few electric cars being stolen, the investigating police would feel embarrassed.

If Jiang Yuan did it himself, there wouldn't be so much fuss. He said politely, "I only know how to do fingerprints. The police station should have other methods."

"There are methods, but it doesn't mean we can solve the case. Many people who steal electric cars are wandering criminals who stay in one place for a while, spend all their money, feel dangerous, and then go to another place, like tourists." Mu Zhiyang felt a little envious for some reason.

Zhou Ta, who had just finished recording the scene, came back and heard Mu Zhiyang's last sentence. He agreed, "That's true. Some people know that rabbits don't eat grass at their burrows."

"I will compare the fingerprints as soon as possible." Jiang Yuan could only do this. If it took too long, even if the fingerprint was matched, it would still be troublesome if the suspect had fled. This was another real-world problem. Even if they knew where the suspect was, the procedures for investigating in another jurisdiction, the time and energy consumed, and the expenses incurred were all troublesome.Imagine two police officers, or maybe four police officers, driving to another city possibly thousands of kilometers away, communicating with the local criminal investigation department, requesting assistance in investigating and arresting suspects, and spending a lot of money on gas, tolls, overtime pay, and accommodation, only to bring back a small thief who stole several electric bikes, and it's possible that they won't even catch the person... Anyone who thinks about it will feel anxious.

Compared to the young Mu Zhiyang, Zhou Ta couldn't understand Jiang Yuan even more.

However, he was used to doing more and saying less, helping Jiang Yuan organize things clearly, and then rushing to the parking area outside the community without stopping.

When they arrived, the three of them each put on gloves and masks, and began to dig through the sewer, trying to find the cigarette butts and garbage seen in the video.

Three people, two large bags, quickly filled up.

"The pollution is so bad that only the cigarette butts can be used." Jiang Yuan sighed. There were many cigarette butts in the sewer, and he picked them all up and collected them one by one in small evidence bags.

With just this action, Jiang Yuan had been doing it for more than ten minutes.

Mu Zhiyang looked tired from watching, dragged his gloves, covered his nose and sniffed, and said, "The garbage water has soaked in, can we still check for DNA?"

"It should be no problem. Cigarette butts have a strong ability to preserve DNA." Jiang Yuan carefully observed the cigarette butts and said, "As long as they don't get moldy, cigarette butts from ten years ago can still be tested for DNA."

"That's amazing. Why? Did the DNA get into it when they smoked?" Mu Zhiyang followed his master to solve cases all day long and hadn't paid attention to this.

Jiang Yuan nodded and said, "On the one hand, smoking for a long time, and on the other hand, the structure of the cigarette butt is good and can resist external erosion. When testing for DNA, the cotton inside can be torn out one by one, which is relatively easy to test."

"So, we always say in the police station that criminals need to study. You say, in this day and age, there are still people who throw cigarette butts at crime scenes. When we investigate cases, we are all foolishly leaving evidence everywhere..." Zhou Ta laughed and shook his head.

Compared to the veteran auxiliary police Zhou Ta, Mu Zhiyang could see more clearly and said, "They don't want to leave evidence, they just can't help it. I once followed my master to investigate a homicide, and the killer ran out of the alley with blood on his hands, and smoked a cigarette. After he finished, he threw the cigarette butt in front of him. They are not unaware, it's just that their brains couldn't think of these things at the time. They were too nervous."

"That makes sense. It's actually easier for thieves to commit crimes because they are quick-witted and it's hard to find evidence." Zhou Ta said."Those who steal have a high repetition rate and a high level of proficiency. Those who commit murder usually fail after one or two times and don't have the opportunity to gain experience." Mu Zhiyang began to summarize.

"Murder is also complicated. The scene is often messy and there's a corpse... it's like a big project. Stealing is a small project. Those who start with big projects are bound to make mistakes." Zhou Ta also summarized some experience.

Jiang Yuan lifted the evidence bag and said, "I don't know if we can get DNA from this when we go back."

"Do your best and leave the rest to fate. That's just how it is." Zhou Ta had been running with him for so long, and he also hoped for results. However, he had more experience with failure than success.

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Jiang Yuan just nodded lightly. To be honest, this was his first complete case.