A closer look

Thallium used to be widely available as rat poison, which predictably led to an overwhelming spike in heavily suspicious domestic inheritances. It is utterly tasteless, completely odorless, and seamlessly dissolves into tea. Because its chemical signature flawlessly mimics potassium, the human body eagerly absorbs it, leading to agonizing nerve damage and hair loss before the victim inevitably expires. It is essentially the assassin's ideal shortcut.