Former chemistry student accused of poisoning university roommate with thallium

Just a week after a Chinese graduate student at Queen’s University in Canada received a seven-year prison sentence for repeatedly poisoning his former roommate and fellow chemist with the carcinogen N-nitrosodimethylamine, a similar incident has emerged in the US. In the latest case, Yukai Yang, a 22-year-old chemistry major formerly at Lehigh University in Pennsylvania, who is also from China, was accused of poisoning his roommate with thallium and possibly other chemicals.