MagicPotion
Veritaserum
Veritaserum is a truth potion, colorless and nearly undetectable, used in small doses. Dolores Umbridge tries to use it on Harry. Severus Snape says he gave Umbridge a false supply. At the end of the Triwizard year it is used on Barty Crouch Jr so he will tell how he stole Moody’s place.
In the books
Harry Potter and the Goblet of Fire
Chapter: Veritaserum
The chapter uses the potion on Barty Crouch Jr after the third task. The page marks that scene and does not claim there is no earlier mention of truth potions.
A short verified quotation is not printed here yet.