Recently, Xueming Li, a Chinese doctoral student at the University of South Florida, experimented withpoisonNews of poisoning of neighbor in New YorkSugarThe community takes notice. Zheng Shuyuan, an associate professor of science at John Jay College of Criminal Justice in New York, said she was surprised. He said that over the past ten years, English-language media have reported at least seven cases of poisoning by international students and Chinese immigrants to the United States and Canada, and “there have been more incidents in recent years.”
He told that the work of poisoning is done secretly and it is beyond the imagination of common people. If the other party’s behavior changes, his or her body suffers from recurring symptoms, the marriage fails, etc., the victim should be extremely cautious. If you suspect that you have been poisoned, you should see a doctor. If poisoning is suspected, collect clues such as empty pill bottles or packaging, loose pills, burning, stains on people or nearby objects, and odors and call the police as soon as possible.
Zheng Shuyuan teaches forensic pharmacology, analytical toxicology, forensic toxicology and other courses at the Judicial College. He said that there are many experimental materials in the biochemistry laboratory, which are poisonous to some extent. If workers at the lab want to take something home, they usually won’t get it. In addition, there are also radioactive substances in the laboratory, which are also harmful to the human body and can neither be smelled nor seen by ordinary people. “These reagents are like knives. They can be used for experiments and murder.”
He said that if you look closely, you will find many characteristics of these cases. The person giving the poison has a high level of education, so poisoning and murder is an intelligent crime. Many poisoning scientists worked in laboratories and had access to these reagents. They know more about poisons and what dose can cause death. These reagents are colorless and odorless, and difficult for consumers to detect if they are added to food in small doses over a long period of time. If the dose is small and the time is short, the eater will only feel discomfort and have few reactions on the skin or digestive system. If this continues for a long time, it will cause problems in the heart, liver and brain and eventually lead to death. “Some people die without knowing the cause of death.”
The most impactful case was that of Tianle Li who poisoned her husband Xiaoye Wang. After April 2009, Li Tianle and Wang Xiaoye had several family disputes and went through the divorce process. On January 14, 2013, Wang Xiaoye went to Princeton University Medical Center for examination due to suspected flu symptoms. After two weeks of treatment, his condition did not improve and became critical. On the 25th, the hospital’s test report confirmed that Wang Xiaoye was poisoned by thallium. After receiving a report from the hospital, the FBI and police immediately intervened in the investigation.
On January 26, 2013, the hospital announced that Wang Xiaoye had died. Two days later, Li Tianle was arrested on suspicion of poisoning and murdering her husband. Investigators found that between December 2010 and January 2011, Li Tianle, a researcher at Bristol-Myers Squibb Pharmaceuticals, applied to the company several times to obtain thallium, and each time the dose was larger.
After Li Tianle was arrested, her 2-year-old son was taken away by authorities, placed in the custody of the New Jersey Department of Youth and Family Services, and placed with a foster family. On October 1, 2013, the local judge announced that Li Tianle had been sentenced to life imprisonment without the possibility of parole for 62 years for poisoning her husband with thallium.
Media report, April 2, 2019,UC BerkeleyEngineer David Xu is accused of trying to poison a co-worker by mixing the poisonous metal cadmium in food and water over several years. The police report stated that a fellow engineer who worked with Xu for several months “noticed a strange odor in his water and food”. The coworker developed “immediate and serious health problems” after drinking the water bottle, sometimes seeking emergency care in a hospital, noting that two of her relatives had also become ill after drinking her water.
Surveillance video from the woman’s office shows Xu adding a substance to her water bottle on two separate occasions recently. Cadmium levels were found to be positive in water samples taken from bottles during this period. Cadmium is a silver-white metal that “can cause organ system toxicity, cancer, or death.” Authorities also took blood samples of the woman and her relatives and found that all three had “elevated levels of cadmium.”
David Xu received his undergraduate and graduate degrees from the University of California, Berkeley. He was the chief engineer at the Berkeley Engineering and Research Center (BEAR) and has been working at the company since 2009. As Chief Metallurgist, he manages a materials and metallurgical laboratory. Cadmium is a metal primarily used in batteries. “Consuming food or drinking water containing extremely high levels of cadmium can cause severe stomach irritation, causing vomiting and diarrhea, and sometimes death.” Long-term exposure to low levels of cadmium can cause kidney damage and cause bones to become brittle and more sensitive. For fracture.
The Alameda County District Attorney charged Xu with attempted murder causing serious bodily injury. Xu was also charged with two other felonies “which may result in death and which may result in serious bodily injury.” Xu is being detained without bail pending trial in court.
On December 11, 2018, Wang Ziji, a 26-year-old student at Queen’s University in Canada, was sentenced to seven years in prison for mixing carcinogens in his coworkers’ food for nearly a year. Since 2014, Wang Zijie and the victim have been engaged in postdoctoral work in the Department of Chemistry at Queen’s University. Both were roommates earlier. In January 2018, Wang repeatedly injected N-nitrosomethylamine (NDMA), a chemical used to stimulate cancer growth in rats, into the food and water of his victims. He did not tell the court any motive but admitted using a harmful substance and aggravated assault.
The director of environmental health and safety at Queen’s University said the university did not disclose how they obtained the product or the materials needed to make it. The director said steps have been taken to ensure that the content is protected from piracy and unauthorized use. The University uses an inventory system to identify discrepancies and account for hazardous materials when they arrive on campus. “Laboratory staff and the space principal investigator also have a responsibility to understand and monitor activities taking place in the laboratory,” he said.
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