The daughter of Lao Qi came back, and she would definitely send Lao Qi to a nursing home, the kind where people cannot jump off buildings. Kong Suo agreed with this matter, otherwise it would be a big trouble in the future. Kong Suo really couldn't imagine what it would be like for two people, one who wanted to chop down buildings and the other who wanted to learn to fly, to compete to see who could pee the farthest.
After working with Chief Kong for a while, Bai Song decided not to go on patrol on Wednesday. He wanted to visit Senior Brother Pan Chen and talk about the case. Just because he didn't understand the technical aspects didn't mean he couldn't help.
After making an appointment by phone in advance, Bai Song arrived there, showed his ID and went in directly.
Unlike what he had imagined, the architectural style here was very ordinary, no different from other departments in the ministry. It didn't have a high-tech feel. Pan Chen waited for Bai Song directly in the lobby.
"Brother, you came down in person?" Bai Song was a little embarrassed: "Actually, I came here this time just to see if I could help, but I was afraid of causing trouble for you."
"How can it be a nuisance?" Pan Chen said, "Actually, this is not as high-tech as you think. We just know some basic laboratory operations. This is not something I invented."
"Senior brother, are there any successful cases in practical application of this?" Bai Song asked.
"Do you still remember the silver case that was solved last year?" Pan Chen said.
"Remember!" Bai Song was surprised.
The Baiyin case is also known as the Baiyin City serial murder case. Between 1988 and 2002, 11 women were brutally murdered, and the murderer has been at large. In March 2016, the Gansu Provincial Public Security Department restarted the investigation, using Y-STR technology to capture the suspect Gao. After interrogation, the suspect confessed to the crimes he had committed. (See Encyclopedia for details)
"In July this year, the Baiyin Intermediate Court heard the case, but it was not made public because of privacy issues," Pan Chen said. "But in our industry, the Y-STR technology used in this case is very representative. In fact, most of the daily work using this technology is to find suspects, and it is relatively rare to find the dead."
"Senior Brother, how far have you come here?" Bai Song asked.
"Actually, this is faster than you think. I estimate that there will be a preliminary result tomorrow." Pan Chen said, "But this technology actually has many limitations, so I won't tell you here. You just need to know that this is actually to query the family tree. At present, some data has been extracted, and it is going smoothly."
"I checked online yesterday and it said that this kind of inquiry is easier the smaller the population flow, right?" Bai Song said, "I can go to Director Kong and take blood samples from some households around the area where the body parts were found."
"What you said makes sense, but the trouble is not here," Pan Chen said, "Generally, there is a general scope for the case. In your case, there is no other material at all, which actually puts a lot of pressure on us. The Y-STR and ITO methods require a control group, and this control group is nationwide. If we can find out, we can write a paper. So this may be a long process. For example, if I give you an area, you have to go there to take samples. At least there are 50 or hundreds of different types of control groups at one time, and then I can come back for comparison. As for the area around the deceased, it is no longer needed. The deceased should be from Shandong Province at present."
"From Shandong Province?" Bai Song was surprised: "My fellow countryman!"
"Shandong Province is very troublesome," Pan Chen shook his head. "Shandong Province is one of the few provinces that has experienced large-scale population migration after the founding of the People's Republic of China. Many people have crossed into Guandong, which has added a lot of trouble to our tracing of the origins."
"It's okay, brother. As long as you give us a head and a direction to investigate, we are not afraid of trouble."
"Well," Pan Chen said, "Come upstairs with me."
After going upstairs, Bai Song learned in detail about this technology that has only matured in recent years, which cast a shadow on this case.
The Y-STR method is mainly effective in areas with stable family inheritance and low population mobility. It is too difficult to find it in Beijing. If it weren't for the database, there would be no way to check it.
Bai Song actually had some misunderstandings about Pan Chen. Pan Chen was a researcher, he didn't have a strong desire to solve the case, he just wanted to do a good job of research, it would be the best if he could find some family information about the case, if he couldn't find it it was due to technical limitations.
Therefore, what Pan Chen said to Bai Song, "There will be a preliminary result tomorrow", did not mean that he would give Bai Song a definite answer, but only a result. As for what the result would be, there was no guarantee at all.
Bai Song was glad that he made the trip. He knew that there might be many families with similar results in Pan Chen's family. He planned to send a notice directly to all regions after arriving at the bureau, asking them to investigate the missing men in this family.
Originally, he wanted to invite his senior brother to dinner in the evening, but Pan Chen had other things to do in the evening, so he had to give up. After returning to the office, he called out several junior brothers and sisters. Except for Li Junfeng who was on duty, the other five people discussed with Bai Song for a while, but they didn't have any new ideas, so they just enjoyed dinner happily.
While eating, Bai Song received a call from the Lou Detachment. Today, they had searched the four residential areas near the area where the body parts were found, but found nothing.
"Director Bai, our case is temporarily on hold," said Captain Lou. "All the police dogs are exhausted today. There is no point in expanding the scope again."
"I understand," Bai Song said, "Leave the case to us when the time comes. We'll contact you when we have specific clues."
"Okay, okay," Captain Lou sighed and hung up the phone.
The poisoning case that Bai Song had handled when he came was already very difficult, and now another one occurred just as Bai Song was about to leave. It's really a troubled time.
Although the director doesn't put too much pressure on him, the homicide clearance rate this year will definitely not be 100%, which is definitely not a good thing for him.
"Don't think too much, cheers," Bai Song raised his drink and drank it all in one gulp with his five fellow brothers and sisters.
Bai Song didn't drink, but several of his fellow apprentices did. They were not on duty today and had experienced a lot recently, so drinking some wine and chatting for a while helped relieve some of the stress.
"Brother, I don't know when I can handle so many cases like you do," Zhang Cheng spoke more casually after drinking.
"Isn't life good now?" Bai Song asked.
"The police station is boring. We don't even get paid a dime for our internship. I really want the internship to end soon... Well, it would be nice if there were always cases to handle..."
"Drink less," Bai Song said, "Many of the days you desperately want to escape from now, you will find it difficult to go back many years later, so cherish them."
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