Prevents the students from cheating;
These spells were used at Hogwarts School of Witchcraft and Wizardry on writing quills and parchment to prevent students from cheating during their final exams, as well as their O.W.L.s and N.E.W.T.s. They could be circumvented with Cribbing Spells.
- Harry Potter and the Philosopher's Stone (First appearance)
- Harry Potter and the Philosopher's Stone (film) (Mentioned in deleted scene)
- Harry Potter and the Order of the Phoenix
- Harry Potter Trading Card Game