Serious Crime Unit 1

Chapter 396 Bone Cave (4)
"We were afraid that he would get lost when he went out, so we didn't give him any money. Just like that, he walked to Sitian Town and was discovered by friends from our village. We brought him back, but he was caught and ran away again and again. Later, we caught him again and ran away again. I didn’t have the energy to catch him and bring him home. He finally disappeared in the summer of 2006, and there was no news from him. Alas, I just thought that my life was bad and that I should lose my eldest son..."

"Did you go to the police station to call the police?"

"Why should I report this to the police? He wasn't killed by his enemies. He got lost on his own. Why bother the police?"

"How tall is your son? How old is he?"

"Not tall, medium height, about 1.67. He was 40 years old when he disappeared, and he is 50 years old now."

Zhu Gang felt that Lin Xiaolu looked like the person they were looking for, so he took out his mobile phone, called up the portrait of the deceased painted by Lu Yingying, showed it to Lin Daxi, and asked him if the person in the photo was his son, but he said it didn't look like it.

Zhu Gang was afraid that the portrait would be inaccurate, so he took out a cotton swab and extracted Lin Daxi's saliva, preparing to take it back for DNA comparison. If the comparison was successful, the source of the body would be found, and then an investigation could be launched.

3
With the DNA sample of Lin Xiaolu's father, it can be compared with the DNA sample of the deceased. However, extracting DNA samples from the bones of the deceased is not easy.

Because the body of the deceased has been exposed to the wild for many years and has been stored for a very long time, the only biological materials that can be used for individual identification and paternity testing are usually bones and teeth.Since the extraction and purification methods used in this type of test materials are relatively complex, it is difficult to successfully detect STR typing, so they are classified as difficult biological test materials.

In addition, expensive auxiliary equipment such as liquid nitrogen grinders are often required during the inspection process, so this work is not carried out in general DNA laboratories.

Therefore, it had to be sent to the provincial capital, so Wu Jiang and Che Xiaolin sent the skull of the deceased to the Changjiang Municipal Bureau laboratory to extract samples.Because it was Wujiang's territory, he was familiar with all the technical experimenters.

The extraction method is to select 1 molar, 2 canines or incisors; place the selected teeth in a clean small beaker, pour in distilled water and soak them to loosen the dirt on the surface of the teeth, and then use a scalpel to scrape the surface of the teeth. Remove the dirt and rinse repeatedly with distilled water until the tooth surface is clean.

Put the cleaned teeth into a clean small beaker, pour an appropriate amount of 5% sodium hypochlorite solution, soak for 15 minutes, discard the liquid, rinse with distilled water 5 times, then add deionized water and soak for 5 minutes to remove the sodium hypochlorite, and then Soak with absolute ethanol twice, take out the teeth and dry them with filter paper for later use.The next step is to do DNA extraction and STR typing testing.

After two days of work, the deceased's DNA was successfully detected, and then Lin Daxi's DNA was tested and compared with the deceased's DNA. The results were inconsistent, indicating that the deceased could not be Lin Daxi's son Lin Xiaolu.This made the entire team of detectives slightly disappointed.

Wu Jiang and Che Xiaolin returned to Songyin County with the skull of the deceased and continued their investigation work.Because no one responded to Lu Yingying's reward request posted on the county bureau's official Weibo and WeChat, everyone could only re-discuss how to find the source of the corpse.

Zhu Gang asked Chen Li to cooperate with Lu Yingying to issue a reward order on two TV stations in the county and city, and mobilized all police officers in the county to go to each village to paste the reward order. At least 50 should be posted in each village. If the work is not done properly, the local authorities will be held accountable. It is the responsibility of the police.

At the same time, the household registration police at each police station are required to search for the missing middle-aged man in 2006, hoping to find clues.

Zhu Gang led Xiao Ke, and Wu Jiang led Che Xiaolin to continue visiting and investigating each village.They mobilized more than 100 police officers from various police stations and branches to work, visited 92 villages, and interviewed 1050 people. They worked for 10 consecutive days but found nothing, which made Zhu Gang very anxious.

The Bones Case is the most difficult of all homicide cases to detect. First, it is impossible to confirm the source of the body; second, it is old and all physical evidence information has decayed with time; third, the family of the deceased has given up their confidence in searching because it has taken too long.

On the third day, everyone sat down for a meeting to exchange information on their respective investigation results and find ways to find clues.

"We have been investigating for several days, but there are no clues. I suspect that the deceased may be from other provinces or counties. If this is the case, I will not be able to find the source of the body even if I visit for several years. However, if we expand the scope of the visit, with our five Six people, definitely not possible. Do you still remember the serial rape and murder case in Baiyin City?" Wu Jiang asked.

"If you don't remember this tragedy that shocked the whole country, why would you be a detective?" Zhu Gang replied.

"The police used Y-DNA information to identify Gao Chengyong. First, his distant cousin with the same surname was placed under residential surveillance for bribery, so the police collected his blood sample. After Y-DNA analysis, the genetic data of this person was entered into Criminals in the Y-DNA database.

"Preliminary comparison shows that the results are consistent with the Y-DNA information of the suspect in the "8·05" major case. The results of this preliminary test show that the suspect has the same Y-chromosome inheritance as this person and is a male member of the same family, so the suspect The surname should be Gao.

"Therefore, the police arrested Gao Chengyong on August 8. He admitted that he was the murderer who serially killed 26 women. I think this method can be used to find out the source of the bodies." Wu Jiang looked at Zhu Gang and said. "This is a good idea, but we currently don't have the equipment and technology."

"Since the discovery of Baiyin, our provincial department has begun to introduce this kind of technology and equipment, and Luo Jin is also involved. I called Luo Jin to ask how the progress is. If it can work, of course it is good. If it has not started working yet, we Send the DNA sample of the deceased to the Ministry of Public Security, or to the identification center of the Gansu Provincial Public Security Department, because Gao Chengyong’s Y-DNA was tested there.”

"Okay, Brother Ang, please call and ask right away."

Wu Jiang walked out of the conference room, called Luo Jin, and asked him if the provincial department could do Y-DNA testing.He said yes, he had successfully found a suspect in an unsolved case and the source of two bones.Wu Jiang was very happy and explained the situation to Luo Jin.Luo Jin said there was no problem, he had already learned the job.

Therefore, Wu Jiang and Che Xiaolin sent the DNA sample of the deceased to the provincial department for testing.Luo Jin quickly arranged for an examination, which was conducted by him and another forensic doctor named Hua Yang.

The characteristic of Y-DNA chromosomes is that Y-STR is inherited from the paternal line and does not recombine with other chromosomes. Unless there is a mutation, all male individuals in the paternal line, including brothers, fathers and sons, uncles and nephews, cousins, and grandparents, have the same Y-STR haplotype.

Therefore, if the database contains the DNA of the deceased's brothers, father and son, uncles and nephews, cousins, and grandparents, then the source of the body can be found.

The test results showed that the DNA of the deceased was a cousin of a man named Lin Yishan.Lin Yishan is from Shuikou Village, Huangting County, Qingjiang Province. He had a fight with Lin Huali from the same village last year. Lin Yishan broke Lin Huali's hand and was imprisoned in the detention center. Therefore, his DNA was left in the database.

Huangting County is 140 kilometers away from Songyin County, spanning three counties and two provinces. Lu Yingying took leave to visit her grandmother because her grandmother was unwell.Che Xiaolin drove Wu Jiang, Zhu Gang, Xiao Ke and Chen Li to Shuikou Village. With the cooperation of the local police station, Lin Yishan was quickly found.

When Lin Yishan saw six or seven police officers coming to his house, he was stunned and said to the local police: "Officer Guo, isn't the matter of my fight in Lin Huali settled? Why do you still come to me? I almost lost all my money in compensation." Yes." Lin Yishan is tall, with a dark face shining with red light, and a cunning light shining in his eyes. You can tell at a glance that he is a shrewd person.

"We are not here about your fight last year. We are here to investigate another case. I hope you will tell us the truth. Do you have a cousin or brother who has been missing for 10 years? When he disappeared, he was about 40 to 42 years old. , 1.65 meters to 1.67 meters tall?" Wu Jiang asked.

"Yes, his name is Lin Yifeng. He is my cousin. He went missing while picking magnolia bark on the mountain on August 2006, 8. At that time, the whole village went up the mountain to look for him. They searched for him for five days in total, but there was no news. I also participated in the search. , but there is no trace so far.”

"How old was he when he disappeared?"

"At 41 years old, he is a hard-working and thrifty good man."

"Does he have children, wife or parents?" This made Zhu Gang excited.

"His wife married someone else three months later and gave birth to a daughter who was raised by my uncle and aunt. She has graduated from college and is working in Wuhan. He has parents, but his mother died of illness half a year after he disappeared, and his father is still there. At home, he has a younger sister and a younger brother, both of whom are already married and starting a business."

"Can you please take us to his father?"

"What are you looking for? He lives in the first house at the entrance of the village. You can go find it yourself. I have to go up to the mountain to work." He was worried that it would be bad to attract the police to his uncle's house, so he refused.

Wu Jiang motioned for everyone to come out. Shuikou Village has a population of less than 500 people and less than 100 houses. It is very easy to find someone.

Lin Yifeng's father is named Lin Jizhong. He lives alone in an adobe house at the entrance of the village. Due to the construction of new houses in Shuikou Village, the entire village has been moved 150 meters south. The new houses are all beside County Road 450 because transportation is more convenient along the highway. The view is wider.

Villagers who are unable to build houses all live in old houses, but only a quarter of the villagers live in old houses.These villagers are either old, weak, sick or disabled, or they are too lazy to eat.

(End of this chapter)