Brother and sister died of bizarre poisoning. The murderer became a mystery. The police disclosed many details of the case for the first time.

　　CCTV News:Pay attention to the solution of a very strange brother and sister poisoning case. The brother and sister who had an accident, the elder brother named Xi Xi, was only 7 years old; My sister’s name is Nini, who is only 5 years old. Within one day, two children of a family died mysteriously one after another, and the parents were in agony. The hospital could not find out the specific cause of death, and the forensic doctor was puzzled. For the personnel involved in the judicial expertise of this case, the relevant experiments were also encountered for the first time in their lives, and they were all difficult problems in the world. How was this bizarre poisoning case solved? Recently, the police disclosed more details of this case for the first time.

　　On May 30, 2016, the 110 Command Center of Jiading Branch of Shanghai Public Security Bureau received an instruction from the Command Center of the Municipal Bureau, asking them to investigate a poisoning case.

　　Xu Huafeng, a policeman of the Criminal Investigation Detachment of Jiading Branch of Shanghai Public Security Bureau."At that time, I only said that two children suspected of poisoning were admitted to our Putuo Children’s Hospital, and now two children have died of poisoning."

　　Brother and sister vomited and abdominal pain, and their condition improved after going to the hospital.

　　According to the instruction information, the police rushed to the hospital for the first time to understand the situation. After asking the family members at the scene one by one, the police also grasped the whole story. It was a brother and sister who had an accident. My brother, Hee Hee, was only 7 years old. Sister Nini, only 5 years old.

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng: "At that time, the father of the child told us that after the child finished dinner on the evening of the 28th, the two children’s brothers and sisters ate a little cherry and sausage one after another, and the two children went to bed at about 9 o’clock."

　　At three o’clock in the morning, the brother and sister had symptoms of vomiting and abdominal pain, and were rushed to the hospital for treatment.

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng: "After arriving at the hospital, after the hospital’s diagnosis and laboratory tests, the children’s white blood cells were basically within the normal range, and they only had symptoms of vomiting and abdominal pain. Considering whether it was acute gastroenteritis, they were treated according to acute gastroenteritis. At that time, they were given intravenous drip, and both children also improved, and they did not vomit or have abdominal pain."

　　Brother and sister died after repeated rescue.

　　When I got home, I watched the two children get better. The husband and wife went out to work again. Because five-year-old Nini was younger, the couple took their youngest daughter with them, while her son Hee Hee continued to be looked after by her grandmother. But before long, Hee Hee had the same symptoms as the night before.

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng: "He was sent to the Children’s Hospital in the early morning of the 30th. When he arrived at the hospital, he went directly to the ICU, because at that time, the child had already had such symptoms of shock. The hospital also considered whether it was caused by poisoning, such as nausea, vomiting, abdominal pain, and even blood purification and plasma exchange, but it had no effect. About 9 o’clock, the boy died. "

　　The sudden change made the family extremely sad. Sad, the child’s father suddenly realized that his little daughter Nini had had similar symptoms to his son before. To be on the safe side, he immediately sent his little daughter to the hospital for examination.

　　Xu Huafeng, a policeman of the Criminal Investigation Detachment of Jiading Branch of Shanghai Public Security Bureau.: "At that time, the little girl looked quite normal, came by herself, and then passed their examination, and there were signs of poisoning."

　　The hospital carried out a series of rescue measures for Nini, but by four o’clock in the afternoon, Nini died because of multiple organ failure. Within one day, the sudden death of two children completely destroyed the family. The children’s families can’t figure out how two good children can leave overnight, just like this.

　　Attending doctor: The disease develops too fast or is poisoned.

　　After understanding the incident, the police learned from the hospital about the whole treatment process of the two children.

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng: "After contacting the hospital, the hospital discussed the medical history of the two children with us from the consultation, diagnosis and treatment to the examination, and to the report of the corresponding examination, because the hospital also felt very confused. How did the two children’s conditions develop so fast that they died so quickly?"

　　The attending doctor told the police that from some situations during the treatment and the symptoms of the two children, they judged that the two children were probably poisoned.

　　Media reports on the news of death have different opinions on the cause of death.

　　After the news of the sudden death of two children was reported by the media, it also touched everyone’s heart. While mourning, there is also a saying circulating on the Internet.

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng"Because there was an article on the Internet at that time, that is, five cherry stones can poison an adult, because we also consulted the corresponding literature. Cherry stones do contain a kind of cyanoside. If you chew cherry stones, it can produce hydrocyanic acid under the action of gastric acid. Hydrocyanic acid is a highly toxic substance, which will lead to vomiting and abdominal pain."

　　So, when the two children ate cherries after dinner, did they chew up the cherry stones and swallow them?

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng: "Parents told us that the two children probably ate a total of about half a catty of cherries, but whether they chewed the cherry core at that time, parents could not see it, and they were not clear."

　　What is poison? Where did the poison come from?

　　There are more and more doubts around the death of two children, and all the doubts point to one word — — Poisoning. But what poison is it? Where does the poison come from? To understand these, the children’s home has become the top priority of all the work at present. Because both children are in line with the symptoms of poisoning, in the on-site investigation, criminal technicians focused on classifying and extracting the food eaten by the two children.

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng: "Their condiments, leftovers, drinking water, and vomit at home. We have all extracted the leftover snow cakes, sausages and tableware that children ate before their death. "

　　All the biological samples that the brothers and sisters may be involved in were sealed one by one, but the exploration work did not stop there. Because there is still a key sample that has not been found — — "cherry stone" In the previous investigation, only this clue is still a mystery. Is the rumor that "cherry pit is poisonous" on the Internet accurate? Does the death of two children have anything to do with cherry pit?

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng: "After field investigation, we found two complete cherry stones in the corner of the room."

　　The case of fire poisoning in the warehouse next to the deceased is even more suspicious.

　　With two cherry stones sealed by criminal technicians, the exploration work in the poisoned brother and sister’s home came to an end. However, when the criminal technicians just returned to the police station, no one would have thought that the warehouse next to the deceased brother and sister suddenly caught fire, which made the poisoning death case more confusing.

　　The fire was neither a short circuit nor arson.

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng: "The leader told me that there was a fire in the warehouse next to the two deceased people’s homes. At that time, I felt particularly puzzled. How coincidentally, the child just died and his next door caught fire."

　　At this time, firefighters also rushed to the scene. After a period of rescue, the fire was quickly controlled. Criminal technicians began to enter the scene for investigation.

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng: "During the on-site investigation, it was found that there was no such wire around the fire point, so we could rule out the fire caused by the short circuit of this wire. Later, we extracted the burning residue. Let’s first check whether there were other combustion improvers, which were caused by artificial arson. Later, the composition of this combustion improver was not detected."

　　The police called the warehouse manager to inquire about the situation and tried to find out the cause of the fire from them.

　　Xu Huafeng, a policeman of the Criminal Investigation Detachment of Jiading Branch of Shanghai Public Security Bureau."Boss, he said that he has lived for many years. He is in the miscellaneous grains business. There are miscellaneous grains piled up in this warehouse. As for how the fire broke out, he is not clear, because he received a phone call from a coolie and came directly."

　　During the investigation, the police also found a surveillance camera installed on a wall outside the warehouse. However, due to the angle problem, the surveillance camera did not record the process of the warehouse fire. It’s very strange to see this fire now. However, it is urgent to test the biological samples extracted from the victims’ families. As a result, nearly 20 kinds of biological samples, including those two cherry stones, were sent to the Institute of Forensic Science of the Ministry of Justice.

　　Judicial expertise routine poisoning causes of death were excluded.

　　Before the test began, the appraisers told the police that they had screened the blood sample of one of the children for poison before.

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng"They have ruled out the common organophosphorus pesticides, tetramine and cyanide, so they are also confused. It can be said that all the common poisons have been screened and all are negative."

　　Aren’t two children poisoned at all? There are other reasons for their death? Are these more than 20 kinds of biological samples, including cherry stones, extracted from their home the night before, worth testing? In the end, the police decided that no matter what the final test result was, these biological samples were the most direct evidence at present and must be tested. After receiving the commission from the police, the appraisers began to devote themselves to the intense experiment. The first thing they have to do is to compare the data of biological samples sent by the police with the common poison data in the poison identification industry.

　　Yan Hui, Associate Research Fellow, Institute of Forensic Science, Ministry of Justice"At present, what we encounter is something that is easy to poison people. For example, there are dozens of kinds of sleeping pills, including prescriptions that are often prescribed at present, pesticides, including rodenticide, and some common psychotropic drugs. Nothing unusual was found in these things, and the result was still negative. "

　　The theory of eating cherry pit poisoning by mistake has also been ruled out.

　　In addition, the appraisers also explained the fact that the cherry pit was toxic.

　　Yan Hui, Associate Research Fellow, Institute of Forensic Science, Ministry of Justice: "In the cherry pit, there is a kind of hydrocyanic radical in a relatively small amount, and it is not to say that it is in every grain. That thing is highly toxic to the human body. The probability that you will have the consequences of this death through the cherry pit is very small and almost impossible. "

　　What is poison? The investigation was once in trouble.

　　Through judicial appraisal, the causes of death of routine poisoning have been ruled out, and the saying that eating cherry stones by mistake has also been ruled out. In the face of such a result, how should the next work be carried out? It has become a difficult problem in front of the police of the task force.

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng: "At that time, the teachers of the Institute of Forensic Medicine were also confused, because the poisons that could be screened and the common poisons had been eliminated. They were also confused about how the two children died. He hoped that we would communicate with them about the on-site investigation and our preliminary autopsy, hoping to find suspicious places from the middle."

　　Expert: fumigation to kill insects or the cause of poisoning cases

　　The criminal technicians gave a detailed description of the previous on-site investigation. When I heard that a warehouse next to the victim’s house caught fire the night before, one of the appraisers suddenly interrupted the criminal technician.

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng: "At that time, Teacher Zhang Jianhua suggested that the granary would use aluminum phosphide to fumigate and kill insects."

　　Zhang Jianhua, Chief Legal Physician, Institute of Forensic Science, Ministry of Justice.: "I have seen a similar case on a CCTV program, which is very similar to this one. It seems that several children were poisoned and eventually died."

　　There have been precedents for toxic gas leakage caused by fumigation drugs.

　　The case mentioned by forensic doctor Zhang happened on July 6, 2015. A woman and a four-year-old girl died at home overnight in a rented room in a wholesale market in Dongli District, Tianjin. Dongli police lasted more than a month and investigated the scene more than 20 times. Finally, the initiator behind this tragedy was found out that the warehouse next to the victim’s house illegally used food fumigation drugs, which led to the leakage of toxic gas.

　　Zhang Jianhua, Chief Legal Physician, Institute of Forensic Science, Ministry of Justice.: "I told him that it can’t be ruled out that the death was caused by toxic gas, because there was a fire at the scene. Can you let a qualified testing department go to the scene as soon as possible to see if there is such a toxic gas?"

　　Phosphine gas was detected in the deceased’s home.

　　After hearing the advice of forensic doctor Zhang, Jiading police immediately contacted the environmental protection department to monitor the environment of the victim’s home. After several rounds of testing, the final result was soon obtained.

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng: "After environmental testing, the composition of phosphine gas was detected in the home of the deceased."

　　Xu Huafeng, a policeman of the Criminal Investigation Detachment of Jiading Branch of Shanghai Public Security Bureau.: "They gave us feedback, and we specifically asked the relevant experts that phosphine does not exist in the air, and it is a gas that is extremely volatile. So there is this anomaly. One of the more common phosphine is aluminum phosphide, which is a common grain fumigation agent. After deliquescence, phosphine gas is produced for insecticidal purposes. "

　　The police poisoned the brother and sister of the deceased.

　　So, is this phosphine gas the cause of brother and sister poisoning? The police decided to examine the two victims immediately.

　　The appraisers use animal experiments first when the samples are scarce.

　　Subsequently, according to the samples extracted by forensic doctors, the appraisers of poisoning began a new experiment. However, when getting these samples, for every appraiser, this inspection project is the most uncertain one since their work.

　　Yan Hui, Associate Research Fellow, Institute of Forensic Science, Ministry of Justice"It is a completely unknown field for us, because only when we find phosphine or phosphine metabolites from the body is it a direct evidence of phosphine poisoning."

　　In this way, in a brand-new field, appraisers began an unknown attempt. At the beginning of the experiment, the first question before the experimental group was "checking materials".

　　Yan Hui, Associate Research Fellow, Institute of Forensic Science, Ministry of Justice: "Every sample of the sample is very precious, because it is very limited. Try a little less. In the end, it is possible that you have tried it all. Before the method comes out, the sample will be gone. What I thought at that time was to use animal experiments instead of this kind of test samples. We basically chose standard experimental animals. "

　　In the next 10 days, the experimental group did not rest for a day, constantly adjusted the sensitivity of the instrument and changed the experimental method, and finally made a major breakthrough. After numerous arguments in the later period, the newly explored detection method began to be implemented on the victim’s examination materials.

　　Yan Hui, Associate Research Fellow, Institute of Forensic Science, Ministry of Justice: "We applied it to people again, and it was successful once, and we made phosphine metabolites, which means that this result has a final effect on this case. Because after we detected it from his body, it provided a very direct evidence for him to be phosphine poisoning. "

　　Appraisal report: death due to phosphine gas poisoning.

　　Finally, the Institute of Forensic Science of the Ministry of Justice issued an appraisal report, which confirmed that two children died of phosphine gas poisoning. According to this appraisal result, the police immediately summoned the warehouse staff.

　　Xu Huafeng, a policeman of the Criminal Investigation Detachment of Jiading Branch of Shanghai Public Security Bureau."At that time, the boss was a little alert. He said that we didn’t have bugs or fumigation. We certainly didn’t believe it."

　　Jiading police once again entrusted the environmental protection department to monitor the environment of the warehouse where there was no fire. Monitoring data show that the air in this warehouse contains phosphine.

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du Meng: "After objective testing, it shows that the boss lied. Their granary must have used aluminum phosphide to fumigate and kill insects."

　　The warehouse staff admitted the fact of fumigation with aluminum phosphide.

　　Finally, in front of the evidence, the warehouse staff admitted the fact that aluminum phosphide was used to fumigate the grain.

　　Xu Huafeng, a policeman of the Criminal Investigation Detachment of Jiading Branch of Shanghai Public Security Bureau.They said that two or three days before the fire, about a dozen tons of grain were fumigated. According to the memory of the coolie, there were a total of one and a half bottles, one bottle was about 300 tablets, and one bottle was about 450 to 500 tablets of aluminum phosphide. "

　　Phosphine was introduced into brother and sister’s room due to broken walls.

　　As Shanghai is in the rainy season in May, nearly 1.5 kilograms of aluminum phosphide was released and deliquesced to generate phosphine gas. However, how did these phosphine gases get into the victim’s house? In order to find out the truth, criminal technicians once again entered the victim’s house for investigation.

　　Shanghai Public Security Bureau Jiading Branch Criminal Investigation Detachment Criminal Science Institute Legal Medical Expert Du MengFinally, we removed the bed where the children slept and removed the sundries beside the wall. We found a broken wall. This damage is the way phosphine spreads. "

　　Spontaneous combustion of phosphine leads to warehouse fire.

　　Speaking of the strange fire, the appraisers analyzed that the culprit was probably related to phosphine.

　　Yan Hui, Associate Research Fellow, Institute of Forensic Science, Ministry of Justice: "Phosphine will also spontaneously ignite, including why the granary caught fire. It is because after it rained that night, aluminum phosphide came into contact with a lot of water vapor. If the concentration was too high, Phosphine would spontaneously ignite."

　　The perfect combination of scientific judicial expertise and careful investigation by the police handling the case finally dispelled the suspicion of this brother-sister poisoning case and defended the justice and authority of the judiciary.