Undetectable Poisons are a type of poison that are presumably undetectable by any method. Severus Snape assigned a "nasty" essay on them to his third year class in January of 1994.[1]
Appearances[]
- Harry Potter and the Prisoner of Azkaban (Mentioned only)
Notes and references[]
- ↑ Harry Potter and the Prisoner of Azkaban - Chapter 12 (The Patronus)