Adwait313: Has the jinx on the dada teaching post at hogwarts been lifted J.K. Rowling: Yes, at last! Incidentally, I know some have asked about Quirrell with regard to this question. J.K. Rowling: He was teaching at Hogwarts for more than a year, but NOT in the post of D.A.D.A. teacher. He was previously Muggle Studies professor.
--J.K. Rowling and the Live Chat, Bloomsbury.com, July 30, 2007 (2.00-3.00pm BST).
Right, OK. Word of God then. I was unsure whether it was that or pure fanon.