|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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- "BEWARE PoiSONed VERMIN trap"
- —Note on the Marauder's Map.[src]
A poisoned vermin trap was a trap designed to catch and kill rats and other kinds of vermin with a poison of some variety. Such a trap was set up in a room of Hogwarts Castle reachable from the Hieroglyphic Hall, Lower Chambers Corridor North-East, and the Secret way to Slytherin Common Room, at least during the 1970s. The Marauders put a note on their map warning of this trap.
- The Making of Harry Potter (Name seen on Marauder's Map)