Chemistry major poisons black roommate for months, pens racist threat on his desk: Prosecutor

College Crimes
An ex-Pennsylvania college student, accused earlier this year of leaving racist graffiti for his black roommate in their dorm room, was arrested for allegedly poisoning him with a toxic metal. Yukai Yang, 22, a chemistry major at Lehigh University, turned himself in Thursday and was charged with attempted murder. Authorities believe Yang slipped thallium—an odorless, colorless, …