Education Minister Hekia Parata says there are more checks in place now than when Robert Burrett was able to move from school to school, and the rules for teachers could now be extended to other staff in schools, including caretakers and bus drivers.
Fifteen years ago, Stephen Parry was Board Chair at Te Kuiti's Pukenui School.
They tried firing Robert Burrett as Deputy Principal after claims of incompetence and drinking on the job.
But the NZEI union defended Burrett, who finally left the school following mediation and a confidential payout.
"The Union perhaps needs to ask itself why -- if they knew what they did back in 2001 in terms of his inability or inappropriateness to teach -- he was allowed to continue on in that role," says Mr Parry.
While there was no evidence of inappropriate contact with children, he says the union was left in no doubt that Burrett was not fit to continue teaching.
Labour's Chris Hipkins says the system has let the victims down.
"What we need is a very thorough investigation into how he managed to get away with this for such a long period of time undetected. How he was able to move from job to job?" asks Mr Hipkins.
Education Minister Hekia Parata says in recent years the Government has strengthened the system.
It's now mandatory for schools to report any teacher or principal who has been sacked, resigned, or left under a cloud. And anyone working with young children is now required to go through a police vetting process.
She's now looking at whether other staff like caretakers and even school bus drivers should be under closer scrutiny.
"So I've asked the Ministry and the Education Council to investigate extending their powers to all people who work with kids in ECE and in schools," says Ms Parata.
There's no timeframe for that decision, but a full ministerial inquiry has been ruled out.
Newshub.
