@@Jiang Fu Town received a message from Jiang Yuan while he was drinking Duck Shit Fragrant Phoenix Single Bush and browsing his phone.

Jiang Fu Town replied with a simple "okay" and fell into deep thought.

"What are you thinking about?" Uncle San sat across from him, took a sip of tea, played with the Butterfly Snow Earth Dog at his feet, and moved Jiang Fu Town's two dogs further away.

The Doberman was only a few months old, but it was already bigger than his Butterfly Snow Earth Dog. When the two dogs were together, it seemed like they were daring Uncle San to play with them.

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Jiang Fu Town snorted and put down his phone to make tea. He said, "Xiao Yuan has to work overtime again. Even government employees are so busy." Uncle San sipped his tea and said he had a case. Jiang Fu Town shook his head helplessly.

"It seems like it's not easy to get a second-class merit. Other people work for 8 hours a day and some of them go home after 4 or 5 hours. Jiang Yuan works for 10 hours, so if they don't give him a second-class merit, who will they give it to?"

Hua Shen agreed, "Xiao Yuan is indeed working too hard. It might be better for him to come back and start a business, open a company to help everyone find things."

"You mean help you find things," Uncle San couldn't help but say, "You bought a safe to keep things safe, but it's always open. What's the use of it?"

Hua defended herself, "It's tiring to open the safe, okay? The door is so heavy. It's fine when you push it, but when you pull it, my legs have to scrape the ground. And I have to enter the password, look at the iris, put my eyes on it, but it often can't recognize me. I just treat it as buying a display cabinet." Jiang Fu Town asked, "Ah Hua, do you have abalone? I remember."

"Yes, I bought a lot of dried abalone back then, but it's too troublesome to stew. There's no one in my family who eats it."

"Give me some. I'll stew some abalone for Xiao Yuan." Jiang Fu Town decisively stood up.

Hua also stood up, "That's right. Xiao Yuan doesn't have a partner yet. He's working so hard, so he must be properly nourished. I also have dried scallops and Jinhua ham. I'll have someone deliver them to you. "Send me a message on WeChat later." Jiang Fu Town raised his phone. "Okay," Hua Shen didn't hesitate and asked, "How much do you want to cook?"

"Enough for a pot, about four or five pounds." Jiang Fu Town said as he started sending messages to order old mother chicken, pork ribs, and chicken feet. Stewing dried abalone is complicated. Besides being careful when preparing it, it also requires a lot of effort, time, and ingredients. For one pound of abalone, you need about one pound of other ingredients to stew it. The whole process takes a few days to complete.

However, Jiang Fu Town estimated that Jiang Yuan would take a few days to return home, so it was just right to eat the stewed abalone.

Criminal Investigation Brigade.

Jiang Yuan rubbed his waist, looked at the screen, and marked and operated when he thought of something. Most of the time, Jiang Yuan was looking at the fingerprint images and thinking.

Fingerprints are very small, but there are actually many points that need attention. Especially for fingerprints that are highly fragmented and slightly blurred, it is necessary to consider the direction of the ridge lines, the width of the fingerprint ridges, the appearance area of the fingerprint minutiae, and the number of minutiae comprehensively. It can be said that the emergence of automatic fingerprint matching systems has greatly reduced the workload of fingerprint matching, but the conversation with the automatic fingerprint matching system has become a complex task.

Sometimes, even if you remove the impurities and extract the most essential and authentic fingerprint, you still cannot find a match because the fingerprints in the fingerprint database are not necessarily the most essential and authentic.

At certain times, what is needed to find a match is actually impurities. Therefore, the conversation with the program is like a conversation with a person.

The initial communication and collision are all about the same question: Are you the essence or the dregs?

After identifying the other party's attributes, the correct approach is to treat the essence with the essence and the dregs with the dregs.

After trying for an afternoon and half the night, Jiang Yuan finally made a judgment:

You are the dregs.

He said it directly, facing the blood fingerprint on the computer screen, he remained calm and silent like an elite.

"Let's talk about it tomorrow." Jiang Yuan pointed at the blood fingerprint with his finger, then left the office and went straight to the dormitory to rest.

It was too late, and he was a little afraid to go home alone.

He had been reading too many cases recently. If he encountered a released killer, a retired killer, or a killer who kills to cover up, it would be bad.

Especially on the night before solving a murder case, choosing to walk alone on the dark road is almost a certain death in movies and TV shows. Even if you don't die, you will be injured and unconscious for a long time. If you're unlucky, you'll have to show a sunny smile after being disabled.

Jiang Yuan returned to the dormitory, locked the door, and finally fell asleep at ease.

The next day, the sun was shining.

Jiang Yuan deliberately slept until everyone went to work before getting up to wash. Then he followed everyone back to the office.Wu Jun arrived shortly after Jiang Yuan, patting him on the shoulder with a smile, "I prayed for luck before I left the house, hope it brings you some good fortune."

"Thank you, Master," Jiang Yuan replied.

"How's it going? Any hope?" Wu Jun, being experienced in the field, knew that fingerprinting could be a long and arduous process. He didn't want to add any unnecessary pressure on Jiang Yuan.

Jiang Yuan nodded, "It's going smoothly."

He felt that if the rhythm of the day continued, there was a chance to get the fingerprint. This confidence was built on his numerous successful matches in the provincial fingerprint competition.

Of course, even with confidence, it was best not to boast about it. Jiang Yuan returned to his seat and quietly began adjusting the fingerprints.

He started with the "rolling and flat" and "rolling, flat, and palm print" databases.

The so-called rolling referred to rolling fingerprinting, also known as three-sided fingerprinting.

This was a more advanced method of fingerprinting, and the operation was quite complex.

During the process, the person being fingerprinted needed to stand by the fingerprinting table, while the fingerprinting officer stood on his left. The officer would use his right thumb and index finger to pinch the sides of the second joint of the fingerprinting finger, while the rest of his fingers and palm controlled the entire hand of the person being fingerprinted. The hand would then be rolled around the officer as the center.

In short, the actual fingerprinting was done by a dedicated fingerprinting officer, usually a police officer.

The advantage of this method was that it could capture all the details of the finger, including the inner patterns of the fingerprints, the peripheral line system, the root seal line system, triangles, and so on.

In theory, any part of the person's fingerprint left behind could be compared with the three-sided fingerprint. Therefore, rolling fingerprinting greatly enriched the fingerprint database. Unless... the fingerprinting officer was unprofessional.

As we all know, people can be unprofessional.

Three-sided fingerprinting was somewhat difficult. Although with proper training, one could master the key points after doing dozens of fingers. However, as we all know, people can be careless. The fingerprints Jiang Yuan was dealing with were too few, and the margin for error was very low. In contrast, flat fingerprinting was simpler. It was just pressing the finger with even ink vertically onto the fingerprint card. Although the recorded fingerprint was not complete, all the fingerprints Jiang Yuan had obtained were within the range of flat fingerprinting. There was nothing to be ashamed of when comparing impurities with impurities.

Jiang Yuan readjusted the feature points of the fingerprint, selected the flat fingerprinting database, and started the comparison.

After two rounds, by noon, when Jiang Yuan was redrawing the feature points for the third round, the fingerprint ranked 12th made him pause. Jiang Yuan took a sip of tea, enlarged the two fingerprint images, and started comparing them one by one. There was no doubt about the match!

Indeed, when he selected the flat fingerprinting database, the fingerprint matching became much easier. Jiang Yuan let out a sigh of relief.

In fact, this fingerprint was more difficult than those he dealt with during the fingerprint competition.

Because during the fingerprint competition, he had used image enhancement skills, which was like a dimensional reduction attack on the previous generation of trace examiners.

This fingerprint comparison had a bit of a head-on collision. However, in murder cases, where was there ever an easy one? Jiang Yuan chose to submit it to the fingerprint database. Soon, the feedback was sent back.

Jiang Yuan stood up and stretched, his bones cracking. He picked up his phone and casually said to Wu Jun, "We have a match."

"Really?" Wu Jun was surprised. Jiang Yuan nodded, "I'll call Captain Huang."

"Old Huang will be thrilled," Wu Jun said, then looked at his right hand, pondering, "Is this trick really that effective?"