Queensland's Education Department says a school principal was wrong to allow a parent of Sikh faith to carry a ceremonial knife onto school grounds.
The Courier-Mail has reported a concerned parent wrote to Education Minister Kate Jones to complain about an incident more than 18 months ago, in which a father was allowed to wear the ceremonial knife, known as a kirpan, onto the grounds of an unnamed school.
Department of Education and Training Director-General Dr Jim Watterston says the principal gave approval after receiving advice from police that the kirpan was allowed on school grounds if covered.
But he said the decision went against the department's policy.
"Knives of any type, whether they are a dull blade or ceremonial, are not allowed on school grounds," he told ABC Radio.
Dr Watterston said he understood the kirpan has "religious value" but there are no "grey areas" when it comes to knives in schools.
"We don't allow weapons into schools. Full stop."
However, he said the principal was not to blame.
"It was unfortunate the principal got advice that was thought to be well-meaning and at the time thought to be correct."