Chapter 733

The technology for doing DNA for dogs is slightly later than that for humans.

The main thing is to solve the problem of genetic markers. It is necessary to determine which genetic markers are stable and can be used for comparison and testing. The Evidence Appraisal Center of the Ministry specifically does this. Around the beginning of 2000, they first completed the DNA appraisal of cattle, mainly used for "Why do you say this cow is yours?"

The ancient way of marking cattle and horses is ultimately not as certain as doing a paternity test for cattle, especially if the other party intends to lead your cow away, or even after stealing it, whether there is a mark on the butt is a matter of two things.

As for doing DNA appraisal for dogs, a famous one is a case in Estonia. A young woman was bitten to death by a dog in the village. The forensic expert used the dog hair and saliva spots collected on the woman's coat to test and compare the 6 dogs of several nearby households, and finally determined the suspect dog.

In modern times, DNA appraisal for dogs has become very simple and easy. The development direction of this technology has turned to the rapid screening of DNA. It is mainly a rapid test kit, used by departments such as market supervision, which can usually rapidly detect genes of dogs, foxes, minks, cats, ducks, rats, etc.

That is, wipe a piece of meat product with uncertain identity, insert it into the box, and in a few minutes to ten minutes, you can know whether it contains meat of dogs, foxes, minks, cats, ducks, rats, etc.

The so-called hanging sheep's head and selling dog meat has existed since ancient times. In modern times... Europe had the 16-country horse meat incident, using horse meat to impersonate beef, and the detection types of DNA test boxes illustrate another not-so-interesting phenomenon, that is, the meat on the market has reason to be suspected of being adulterated, and the source of adulteration may not necessarily be dog meat or duck meat, but cat meat, fox meat, mink meat...

In addition, raccoon dogs belong to the canine family and are often used to impersonate dog meat.

In short, most of the DNA appraisals done by the Evidence Appraisal Center for dogs are economic cases. Therefore, suddenly involving a homicide case, and a major case, the technician handling it was quite excited.

Before Jiang Yuan finished the autopsy, the technician from the Evidence Appraisal Center brought the report himself and delivered it from thousands of miles away.

"That, the dog's corpse you want to appraise is a Malinois." The technician asked for directions all the way in, and when he saw Jiang Yuan and others, he looked very happy.

"Ah... Brigade Lou is here, and I troubled you to deliver it personally." Zhan Kan was doing skull restoration, feeling dizzy, and came to welcome him while holding the skull, and introduced him to Jiang Yuan by the way.

"We are so familiar, so let's not shake hands... Hello, Forensic Expert Jiang, I am Lou Fengguo..." Lou Fengguo ran up, his eyes fixed on Jiang Yuan, his gaze like a fan who bought the front row at a concert.

The report he held in his hand was also like a ticket bought by a front-row fan. Jiang Yuan thanked him repeatedly and took it to look at.

Lou Fengguo introduced from the side: "Malinois is a Belgian Shepherd, and it is also a common working dog. However, this kind of dog is also one of the dogs that causes the most trouble. It is particularly easy to get excited. When working, the working time is long, but if used as a pet, it is actually very easy to cause trouble. Especially the Malinois mix. The personality of the Malinois itself is already very unstable, and after mixing, it is even more unstable."

Jiang Yuan nodded as he listened and asked: "What about this one?"

"Pure." Lou Fengguo pointed at the table in the report with his hand and added: "The price of Malinois is not expensive. Of course, there may be very expensive ones, but ordinary purebred Malinois are only one or two thousand, two or three thousand, depending on what channel you bought it from. It is troublesome to raise this dog in the city. It eats a lot, poops a lot, walks for a long time, and loves to shed hair."

"But if used as a police dog, or used for work, it is very suitable, right?" Zhan Kan didn't want to look at the skull anymore, sat over and talked.

Lou Fengguo nodded: "That's for sure. The working ability of Malinois is very strong. It can climb trees, climb walls, has super jumping ability. Police Malinois can easily go to the second floor, has strong vigilance, and bites hard. In addition, if you raise it as a pet, it has a long excitement time. Being easy to get excited is a disadvantage, but as a working dog, it is too suitable."

"Can you find its owner, or related personnel, through DNA?" Jiang Yuan took its DNA, naturally aiming to solve the case.

Lou Fengguo became excited at this time, and the short hair on his arms stood up. He said so much, just waiting for this sentence from Jiang Yuan.

"If it were someone else, I guess I could only wait for you to bring the DNA over and then compare it. The pedigree of Malinois is quite complex." Lou Fengguo said with a self-satisfied smile: "But in this aspect, I still have some insights."

"Hmm... do you want to join our special case team?" Jiang Yuan's words were exactly what Lou Fengguo wanted, but it made Lou Fengguo feel surprised.

Lou Fengguo couldn't help but touch his short hair: "You don't even ask about the technology I'm going to use?"

"I don't know much about DNA appraisal." Jiang Yuan answered, then thought that the other party was not just a perfunctory leader, so he added: "What technology are you going to use?"

"Dogs of different bloodlines definitely have some stable DNA inheritance. The dogs in our country have relatively simple sources. It just so happens that I have some understanding in this aspect. Hmm, frankly speaking, people in the circle call me the Dog Expert." Lou Fengguo became proud as he spoke.

It was probably indeed a point of pride.

Given the level of talent in Beijing, since Lou Fengguo dared to call himself an expert, he must be at least an LV3 or higher dog expert. If it weren't for the circle of pure enthusiasts, Lou Fengguo's level might be even higher.

Jiang Yuan couldn't help but think of the first skill he acquired, the LV5 dog rice skill, the legacy from the victim Chen Manli. Chen Manli had not received any professional training, just pure hobby and talent, completely self-taught, reaching the LV5 level.

Jiang Yuan estimated that if he entered the DNA laboratory, his DNA appraisal level would be LV0.8 at most, and it was very likely that he only had an LV0.4 level.

This thing is what is called easy to learn but difficult to master. The simplest operation is similar to self-testing nucleic acid, but if you advance a little bit, the difficulty is theoretical, such as the instruments and equipment used, which country and which company produced them, which must be particular about, otherwise the results will be different.

The processing of test samples is even more particular. What aqueous solution to use for soaking, the homogenization plan, temperature, enzymes, the types of solutions added multiple times, especially primers, the complexity is not exaggerated even to LV5.

Although the DNA appraisal of different organisms is similar, as Lou Fengguo said, to trace the source of the dog and determine its certain stable inheritance, the difficulty soared.

"Then I will leave the task of finding the dog to you." Jiang Yuan made the decision quickly.

Lou Fengguo was a bit unaccustomed and couldn't help asking: "Don't you need to examine me?"

Jiang Yuan looked at him, started to put on gloves again, prepared to continue the autopsy, and asked: "Do you really understand dogs? Can you trace the bloodline and source of this dog through the existing residual bones?"

Lou Fengguo immediately said: "Tracing the bloodline is no problem. If tracing the source, it may still need a little luck..."

"That's fine." Jiang Yuan interrupted Lou Fengguo's words.

Lou Fengguo: "That's fine?"

"Hmm, this case, from top to bottom, is concerned. I am from Ningtai, and I originally have no power to manage you..."

"How can that be? With your current reputation, Team Jiang..."

Jiang Yuan waved his hand: "I mean, the expenses for this case are not small, and it involves a lot. Not only the Zheng Guang Bureau, but everyone up and down is paying attention. I don't need to manage them one by one, and I don't have time..."

"Team Jiang, don't just say scary things." Zhan Kan hurriedly stopped Jiang Yuan and said: "I feel a bit cold."

Jiang Yuan said "Oh," changed to a gentler tone, and said: "Brigade Lou, welcome to join the special case team. Just try your best to do things well. Detachment Tao and the others are watching everything you do."

Not only was Tao Lu watching, but Qi Changye and his colleagues were becoming increasingly anxious.

After 24 hours of personal effort, Qi Changye couldn't wait to come to the dissection center.

The large characters of the dissection center embedded in the wall were gray and dusty. From a distance, it was just an ordinary building, but in Beijing, nothing is ordinary.

The corpses had to be gathered for a game of mahjong to form a scale and attract attention.

Before Qi Changye entered the door, he also scratched his hair, making it look like a head that had been covered by thinking.

"Team Jiang..." Qi Changye entered, his voice miserable.

Jiang Yuan heard this sharp voice, first looked seriously at the skeleton on the dissection table, confirmed that it was not shouting, then turned to look at Qi Changye, and said: "Division Chief Qi, my autopsy here is not finished yet... are there more corpses?"

"I dare not, sigh... I don't know either." Qi Changye sighed and added: "We interrogated for a day yesterday and encountered some problems."

"What problem?"

"Really no one knows what's going on with these corpses." Qi Changye was a bit solemn and a bit puzzled: "I saw them come this way with my own eyes that day."

Jiang Yuan frowned slightly. Indeed, from Qi Changye's perspective, the corpses were likely left over from the previous spy case. Theoretically, there should be some rumors...

"The murderer ran away?" Jiang Yuan gave a guess.

"All ran away? Not very likely." Qi Changye also agreed with Liu Jinghui's speculation. This way of burying corpses must be done by several people together.

Moreover, from Qi Changye's feeling, if four or five people were to form a team to bury corpses, then this team couldn't just have four or five people, because everyone might have something to do, might get injured, or might ask for leave. If there were a shortage of people, either others would carry everything, or they would have to be supplemented.

Supplementation is the most likely situation, so there should be many people who know the truth.

Furthermore, in the sequence of the spy case, the level of these insiders is probably not high. Action being lower than intelligence is the norm in the organization. Therefore, in the situation where many people have been arrested, it is unreasonable for all insiders to run away.

Qi Changye was silent for a moment, then whispered: "Did you find my special agent?"

"Not yet." Jiang Yuan spread his hands, thought, and added: "However, it is impossible to find all the corpses buried at the bottom."

"This... sigh..." Qi Changye sighed.

Seeing this, Jiang Yuan coughed twice and said: "If you are not going well here, why don't you try our method?"