The Third Floor Corridor...
... Is only banned in Harry's first year of Hogwarts never after and never before. So if your reading a book from the Marauder or past Era and you get to Dumbledore's Speech and you hear "he just blabbed on about the usual stuff forbidden forest, third floor corridor out of bounds and please welcome our new defence against the dark arts teacher................................." It doesn't work.
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Facts About Harry Potter that People Keep on getting Wrong
FanfictionThis book is just a book of incorrect Harry Potter Facts being corrected by me if you don't like it don't read it.