Text/Yangcheng Evening News All-Media Reporter Dong Liu
Liu Chao: Focus on DNA solving cases and fills the gaps with multiple achievements
Liu Chao is the main founder of forensic genetics in my country. In the early 1990s, forensic DNA technology was a blank in many aspects. He conducted repeated experiments on more than 6,000 foul-smelling corrupt body examination materials. After 10 years, he established DNA identification technology for corrupt inspection materials, guided the establishment of 18 provincial and municipal DNA laboratories to fill these regional gaps; built my country’s “ministerial-provincial-city” DNA database to realize data sharing and large-scale application, and Guangdong Province alone directly compared more than 300,000 cases.
The identification of the cause of death of corrupt corpses in the water has been a major problem recognized by international forensic medicine for a hundred years. After 10 years of experience, he led the team to make major breakthroughs in key technologies such as diatom enrichment extraction, qualitative quantification, and DNA testing. The results have reached the international leading level, and have been identified in more than 3,100 cases. In response to the issue of the reliance on import of key reagents for DNA testing, he took the lead in the development of 12 series of reagents such as high-throughput Y-STR, which forced similar foreign products to reduce the price by more than 50%. This result has been promoted nationwide, and Guangdong alone has solved more than 300 murder cases in recent years.
He formulated 6 national industry standards and was authorized to 10 invention patents; 12 research results reached the international advanced level, and won 4 second prizes of national scientific and technological progress (3 of which ranked first); he won 2 first-class individual merits, and won the National Advanced Worker, National May 1st Labor Medal, National Excellent Science and Technology Worker, National Outstanding People’s Police and other honors.
Liu Chao
As the second-level police technology director of the Criminal Police Detachment of Guangzhou Public Security Bureau, Liu Chaogang, 58 years old, was awarded the title of “Outstanding Communist Party Member of Guangdong Province”. In addition, he has many identity cards: professor, doctoral supervisor, deputy leader of the China Criminal Technology Standardization Forensic Genetics Group, China LawBabaylan Deputy Director of the Physical Evidence Professional Committee of the Medical Association, Deputy Head of the Expert Group, and Director of the Academic Committee of the Key Laboratory of the Ministry of Public Security of Forensic Pathology.
After retiring from the leadership position last year, Liu Chao focused on solving the accumulated cases of difficult murders. Over the past year, he has solved seven difficult cases that have not been solved for many years, and DNA is still his powerful weapon for “attack”.
Liu Chao at work
After resigning from his leadership position, he devoted his main energy to solving murder cases
Yangcheng Evening News: I retired from his leadership position last year. Can you breathe a sigh of relief?
Liu Chao: Although he no longer served as the captain of the Criminal Police Detachment of Guangzhou Public Security Bureau last year, some murder cases that have not been solved in Guangzhou in the past 20 or 30 years have always been a stone that has been pressed on my heart.
My previous detachment captains always told me before retirement: Which case has not been solved? I hope you will solve them before retirement, and I hope you will pass on these unsolved murder cases to the next generation.
The criminal investigator has a special feeling – solving cases, the most important thing in solving cases is solving murder cases, and the most difficult thing in murder cases is accumulationKomiks case.
Yangcheng Evening News: What are the characteristics of these murder cases?
Liu Chao: Some cases were some cases that I encountered when I was in my twenties and thirties when I first joined the public security work. The scene of those cases – blood flowing like a river on the ground, the body was highly corrupt, and there were no technical conditions to solve the case. Although so many years have passed, these cases have been these cases, but these cases have been The scene of the case is still vivid in my mind.
Yangcheng Evening News: Why are these cases difficult to solve? Is there little physical evidence?
Liu Chao: The criminal case we are talking about is not only reflected in the lack of evidence on the scene. The causal relationship of the case is unknown, the motive for the crime is unknown, and the nature of the case is unknown. Such cases are difficult to solve.
For example, a person who is usually very outstanding and honest suddenly goes to another place to kill someone he doesn’t know one day, and the evidence on the scene is very small. href=”https://funnybookish.com/”>KomiksCase like this is difficult to solve.
For example, the case of “2004·7·13” in Huangpu, Guangzhou, the suspect sold apples with his father in Huangpu, Guangzhou when he was a child. Before committing the crime, he wanted to do business, but he didn’t have enough money. He came to Guangzhou and went around and went to a hair salon shop. The hair salon shop asked him if he wanted to stay—twenty or thirty yuan. His motive at the beginning did not want to kill people. However, during the prostitution process, due to problems such as prostitution, he used local materials to commit murder. He killed one person first, but this process alarmed another person… He killed someone the night he came to Guangzhou and left Guangzhou the next day after the murder. After the suspect returned, he hid in the coal mine for more than six months. Later, he felt that the wind was calm and he returned to the village and never left the village again. When others bullied him, he endured it. When others owe him money, he dared not ask for it or chase it. The village KomiksPeople say he is an honest and good person, and he has lived like this for more than ten years after the crime.
Yangcheng Evening News: How did you break through?
Liu Chao: Rely on DNA. There was a small episode before we arrested people. The household registration information showed that he was only one meter-5 meters tall, but we analyzed the suspect based on the crime scene that it should be 1.7 meters. In this case, do you dare to arrest people? I made the decision. It is absolutely no problem to arrest them because we have the strong technical support of DNA. Later I learned that it was about 2Komiks 0 cm in height “poorBabaylanDistance” is that the height data on household registration materials in the early years was self-reported and inaccurate. Thanks to the innovation and progress of science and technology, such a accumulated case can be solved.
Yangcheng Evening News: What reaction did he react when you arrest him?
Liu Chao: When we found him, he cried, and the first sentence he said was “Finally freed.” ”.
So back to what I said just now, this case is difficult to solve. The difficulty lies in the fact that he came to Guangzhou by chance, left after the case, and never committed the crime again after going back. He has been an honest man for more than ten years, got married, and had a son and a daughter. But even so, he could not escape the judgment of his conscience. He said that he often had nightmares at night. After being arrested, he told us that he wanted to see his wife and said something: “Wife, sometimes I lose my temper because my heart is not calm (pure), I hope you forgive me. ”
Later, I accompanied him back to Guangzhou by train. He cooperated very well along the way, telling us the whole case and the thoughts of the years.
Absent ceremony held after successful DNA recognition (Liu Chao)
“The greatest sense of accomplishment was found when the difficult murder case was solved”
Yangcheng Evening News: After retreating, how many such murder cases have been solved?
Liu Chao: The brigade of our criminal police detachment solved the murder case last year, a total of 92 murder cases were solved. I used to be the “top leader” of the criminal police detachment, but I didn’t solve so many cases. Why? It’s because I’m now calming down and focusing on solving these accumulations. href=”https://funnybookish.com/”>Komiks case. There are 7 cases in which I led my own team to find clues and arrest people. These seven cases are cases that have not been solved by previous task forces over the years. In addition to correct ideas and scientific methods, these cases also require hard work. For example, the case I just mentioned was a business trip to Shaanxi to arrest people. I CinemaThey found clues through reanalysis of case inspection materials for more than half a year. They went on a business trip and searched through DNA technology. I took the lead in forming DNA experts from Shaanxi, Shanxi and Guangdong provinces to analyze them. Every night, I had to get up before 5 a.m. to start a new day’s work.
Although hard work, others can’t understand the excitement after solving the case. Why do I talk endlessly when I talk about these cases? Because I am very excited.
Yangcheng Evening News: What is the key to solving these old murder cases?
Liu Chao: DNA! I am Babaylan is a DNA man.
For example, in March this year, I led a team to Yunfu City. href=”https://funnybookish.com/”>BabaylanTiantang Town arrested a murder suspect. This case occurred in a double murder case in Panyu, Guangzhou in March 2007. I remember when I arrived at the scene, the entire ground was covered with blood, and my feet could not step on the blood. This case has not been solved for many years.
Last year we sent police forces to investigate and judged that it was an acquaintance who committed the crime, but the suspect could not be found. I led the team and stayed in Yunfu Tiantang Town for more than a week, and finally locked in the suspect. These two suspects have been good since childhood. After coming to Guangzhou, I heard that the victim’s family was rich, so I knocked on the door and robbed and killed people, and each person killed one. After the killing, I signed an attack.Keep the alliance – no matter who speaks out, the other person cannot escape. At that time, among the many blood stains at the crime scene, we only found trace blood marks of the suspect. But we have not given up for so many years, and finally we have to find the perpetrator by searching the DNA genealogy.
At nine o’clock the night before the arrest, I drove to Yangchun. It was already eleven 10:30 in the evening. I immediately held a live meeting. At about 2:30 in the morning the next day, one of the suspects was arrested and the preliminary trial was conducted overnight. At around six o’clock the next morning, we went to the construction site to arrest the second suspect, but we didn’t close our eyes all night.
Yangcheng Evening News: Do you work like this often? Do you ever want to do it because you feel tired?
Liu Chao: When we criminal investigators discover clues to major cases, they are more excited than anything else and absolutely have no feeling of being tired, so I often say that we will never say we are tired. When we solve the difficult murder case, we feel the greatest sense of accomplishment. This is to give the deceased an explanation, and it can also create a shock to the crime: as long as the case is done, justice will come sooner or later.
The most difficult case: There are only one case containing the suspect’s DNA in the Panyu family annihilation caseKomiks
Yangcheng Evening News: Which case is the most difficult case for you in your career?
Liu Chao: The 2014 Guangzhou Panyu Family Impact Case – Three Generations of Six Life. I remember Cinema very clearly. It was April 29. I arrived at the scene and stayed there for six days. This case was the most difficult case I experienced. When I mentioned this case, the scene at that time was echoed like a movie. How was this case discovered? At that time, the neighbor downstairs found that water was always dripping on the roof, so he went up and knocked on the door, but he didn’t respond after knocking for a long time. After the community security guard came, he found that the family had not reported for decoration and the owner’s phone number could not be reached. Finally, he called the owner’s relative to open the door. As soon as the door opened, the body was found, so the case was reported.
When I arrived at the scene, there was still water in the house. The criminal stayed in the house for more than 20 hours. The criminal first checked the site in the community, then bought ropes, searched online for how to avoid surveillance videos and why they were not paid attention to it, and bought a new set of clothes before committing the crime. Then he went up to the roof, tied the rope to the roof, and slipped through the window to the residents downstairs, and carried out the robbery. After the first person in the house discovered him, he killed the other party. This process alarmed the others in the house. He was so angry… The criminal was very cruel. A female victim had already run out of the door, but was finally dragged into the house and killed by him.
After the murder, the criminal cleaned the scene in the house and wiped out the evidence. BabaylanMop with a mop, rinse with water, and burn with fire. He also washed away all the blood from the body and left. He doesn’t want to leave any evidence.
After we checked the scene, the question arose: six people were killed at the same time, was it one person who committed the crime or how many people committed the crime? Difficulty in identification! Is the family extermination due to revenge, robbery or other reasons? Qualitative difficulty! I conducted continuous inspections of the site from April 29 to May 5. During this period, the Ministry of Public Security had done a task to send an expert team to Guangzhou to guide the case on May 3. We reported that we were confident of solving this case, so the Ministry of Public Security decided to give us another two days. The task force is under great pressure day and night.
On May 6, among thousands of samples, the DNA of the suspect was finally found in one of them! After obtaining this major breakthrough, our deputy director in charge of criminal investigation led the team to arrest people, and the suspect was arrested in more than ten minutes.
How cunning is this suspect? The Komiks U shield and bank card he grabbed did not withdraw money after getting the password, but planned to wait for the police to put down the case and relax their vigilance before withdrawing the money. He took off his computer host, hid the card in the computer, and installed the host case.
Yangcheng Evening News: Did the suspect who committed the crime think that you could find him?
Liu Chao: He didn’t expect it, he never dreamed it, let alone so quickly. He felt that his plan was a “hundred secrets” – new clothes, new ropes, and even shoes were newly bought, their hair changed and their postures were changed to avoid monitoring. In order to avoid investigation, he carefully designed all of this.
Seeing corpses now is like seeing a “soul messenger”
Yangcheng Evening News: The profession of forensics is quite special. It often deals with corpses or even highly corrupt corpses. Many people dare not even look at such evidence photos in court. Do you feel this discomfort or fear in your work in this profession?
Liu Chao: At the beginning, I was dealing with various corrupt corpses. I couldn’t eat. I felt uncomfortable and had nightmares. Later, when we got used to it, when we saw the corpses, we felt that it was the “soul messenger” who was talking to us. The souls of the deceased were giving you this task of finding the truth. I ate a box lunch on the spot and continued to do it after the meal.
Many people feel uncomfortable when they see the corpse. Our forensic doctor objectified the corpse. We see the corpse, just like a car lover seeing the best car. Over time, when we look at the corpse, we will no longer feel uncomfortable and other things. On the contrary, finding the truth is our job. You have this kind of responsibility. The more difficult the case is, the more you test your ability and skills.Technique, toughness.
Sometimes, when you go to a scene, you step on it and step on the maggots. After you come back, there are maggots in the soles of your shoes, and your clothes smell like a corpse for two or three days. Therefore, if we have been to such a scene, we usually don’t go home first, go back to the unit and wash and change the clothes, and go back to the unit to sleep for two days before going back.
Yangcheng Evening News: How long does it usually take for a person who works for forensics to go from discomfort to adapting?
Liu Chao: A forensic doctor who loves this profession can overcome the various discomforts caused by seeing the corpse within about three years, but some people can’t continue to do it after studying forensics, and some even faint and can’t do this job.
Yangcheng Evening News: I have been doing this job for 30 years. Your understanding of justice and life should be different from that of ordinary people, right? Liu Chao: I tell you that sometimes, we go to search for the corpse. When the corpse is dug out and heavy BabaylanWhen it was sunny, it suddenly started to rain heavily on the scene. I have encountered such a situation four or five times, and from this I feel that the way of heaven is better and the law is still better. This also seems to be a reminder of the world: everyone must have a sense of awe for life.