A former headteacher who provoked a staff revolt following allegations of incompetence can continue working as an inspector.
Geoff Jepson left St Martin's special school in Derby in 2001 by mutual agreement after a vote of no confidence by teachers. An investigation into claims about his lack of competence and integrity, which he has always denied, was never completed.
Now an inquiry by the Office for Standards in Education has concluded that Mr Jepson can remain an inspector.
An Ofsted spokeswoman said they based their findings on the local authority's investigation, even though it was unfinished.
"We were satisfied with the results and so Mr Jepson's name remains on the roll of inspectors," she said.
Teachers who had complained about Mr Jepson said they had not been contacted by Ofsted.
Almost the entire school staff signed a statement in 2001 saying they had "no confidence in the integrity of the head or his ability to manage the school".
Ofsted's own report, which covered the period 1997-2003, criticised the "chaotic finances" and "weak leadership" while Mr Jepson was headteacher.