An Auckland school failed to act on concerns raised by two teenage students who felt unsafe around their teacher - six years before he was arrested for sexually grooming one of them and other underage girls.
The lack of records on the employment file of Damian Christopher Gillard at Papatoetoe High School also meant the 2006 complaints were missed by a 2009 police inquiry for similar allegations of which he was later acquitted.
Gillard, the head of the languages department, was eventually convicted of making sexual advances to one of the pupils who complained and six other young girls - after a second police investigation in 2012.
He was sentenced in May to 9 years in prison for a raft of sexual crimes, dating back to 1994 when he was a teacher at Greenmeadows Intermediate in Manurewa.
One of the victims was a 15-year-old student propositioned by Gillard who offered to pay her money for sexual favours in 2006.