The next day, Zhang Cheng went back to sleep. Wang Xiaohao and Wei Yingfa were on duty today. Bai Song took Li Junfeng, Ha Wule, Zhang Ning and Ma Yibin out to investigate the case.
The five people were divided into two groups, Ma Yibin led Li Junfeng, and Bai Song led Hawule and Zhang Ning.
There are many labor markets in Beijing. One is the "talent market" that mainly recruits college students, and the other is the "labor market" that recruits manual laborers.
For a city like Shangjing to function, it needs tens of millions of workers to provide services, and the daily consumption is astronomical. Take water consumption as an example. Shangjing can consume the water of a West Lake in just three days.
…
It is impossible to determine the identity, educational background, etc. of the deceased from the bones of the body, but from a probabilistic point of view, since no one has reported the death for such a long time, it is very likely that the person was a migrant worker, so the main focus is on the labor market.
Since there are many hospitals in this vicinity, including the Union Hospital, there are a lot of people working nearby, and the situation is chaotic.
In the morning, everyone searched many places, but no one had such an impression. Bai Song also heard some bad news, that is, many foremen can't remember their subordinates at all. They have several people coming in and out every day, and they have no impression of them after more than a week, unless the person caused trouble for him.
In this situation, trying to find out who is missing is like looking for a needle in a haystack.
China is really too big, and it is impossible to count all the missing people. Apart from other things, there are at least millions of deadbeats who run away every year. Some of them have been dead for a year or two and no one in their family knows about it. The identity of the deceased...
In the afternoon, everyone heard good news. Through unremitting efforts, DNA was successfully extracted from the bones of the deceased, and preliminary identification had been made. It has now been sent to the First Institute.
Because of this matter, Bai Song called Senior Brother Pan Chen.
"Junior brother, don't worry too much." Pan Chen was not as persistent as Bai Song: "My teacher is here too. He is a leader in Y-STR technology and is well-known in the country. He should be able to give you what you want as soon as possible."
"Brother, can you tell me what this technology is..." Bai Song said he had no idea at all.
"You should be thankful that the deceased you encountered is a male. If it is a female, it will be very troublesome and require passive comparison one by one, which is purely guessing the answer. Men have an ancestral Y chromosome," Pan Chen said, "You know, if your Y chromosome excludes mutations, you and your ancestor 3,000 years ago have the same Y chromosome. Y-STR detection technology is a necessary supplement to autosomal STR and MT DNA genetic marker technology. During the migration of humans, the Y chromosome has formed a genealogical and regionalized inheritance, so it can be used to trace the family and ancestral home of the deceased. Not only that, because our database contains a database of tens of millions of Y chromosomes, it is possible to analyze and trace the source through Y-STR technology." (The technology has been made public on the Internet, please do not edit it)
At this point, Pan Chen continued, "As for the specific DNA profile, the technology in China is not yet mature. I can only do my best. If I'm lucky, I can even find out which village he is from."
"That's enough!" Bai Song was overjoyed: "This new technology is amazing!"
"It's not a new technology, it's just that its application is relatively mature. DNA imaging technology is considered a new technology," Pan Chen said, "Then I'll get busy."
"Okay, thank you for your hard work, senior brother." Bai Song hung up the phone without any further ado.
After hanging up the phone, Bai Song said to everyone, "Okay, let's not be clueless anymore. Let's wait for Senior Brother to find the family tree of the deceased, and then go to each place to ask which family has someone missing. That will make things easier."
"What do you mean?" Hawule asked.
"I'll call Chief Inspector Ma and tell you later." Bai Song sighed, "Compared to them, we are just so uneducated..."
Everyone chose to meet at the entrance of a labor market. After listening to what Bai Song said, they were all extremely shocked. Five of them had been searching here for most of the day, without even eating, and without any clues, while others could directly trace the source through technology. The difference was like heaven and earth.
"Is this the big boss?" Li Junfeng was full of admiration after hearing this: "Just from this piece of bone, he can actually find out his ancestral home... This..."
Li Junfeng, like Zhang Cheng, is from Shandong Province. Upon hearing that Senior Brother Pan Chen’s fighting ability is so high, he didn’t know what to say and could only say that he wanted to cry.
“Alas…” Ma Yibin also felt a little speechless: “Look at them, I deserve to stay in the police station for the rest of my life.”
"I feel like I'm not worthy of being a policeman," Li Junfeng said with admiration on his face.
"Alright, alright, stop making jokes. He is a pure researcher, and once a technology matures, it will gradually be used in our daily work. The division of labor is different. You can't ask him to come to the police station to deal with a fight between old ladies, but he can do it," Bai Song could only comfort them.
"By the way, is there nothing we can do if it's a woman?" Zhang Ning asked.
"Well, we can't take this approach. But there are other ways. The DNA profile he mentioned will definitely become more mature in the future." Bai Song said, "That's why many unsolved cases that have been pending for more than ten years have been solved by the police. The advancement of technology is really amazing."
"But more women were killed than men..." Zhang Ning said, "I saw it on the news..."
"Not really," Bai Song interrupted Zhang Ning, "It's just the news selling anxiety, making you feel that women are weaker and more vulnerable. In fact, most of the deaths in homicides are men, because men are more aggressive by nature. I remember a statistic done abroad, and the ratio was about 3 to 1."
"Is that so?" Zhang Ning was still very smart: "These media just love to sell anxiety."
"Selling anxiety is a great profit with no investment." Bai Song sighed, "Has everyone not had lunch yet? Let's go and have something to eat."
"What do you want to eat?" Ma Yibin said, "I'm the oldest, I'll treat you."
"I see people lining up for that fried pancake on the roadside. It must taste good, right?" Zhang Ning said, "People buy it at the labor market there."
"How can you eat this when I'm treating you?" Ma Yibin said, "Let's eat good food."
"Let's eat this, it smells delicious." Bai Song also knew that Ma Yibin was quite frugal in his daily life: "If they can eat it, why can't we eat it? We often eat this when we go out to handle cases."
"Yes, roadside stalls are the most delicious!" said Li Junfeng.
"Okay, then add more meat. You're welcome." Ma Yibin was also hungry at this moment, and the food from the stall next to him smelled really good.
"Okay," Bai Song said, "I want a big portion."
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