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The Auditor-General's Office yesterday released its second monitoring report on the recommendations and said progress would stall unless "more concerted effort" was put into making them work.
The inquiry was held after several allegations of sexual misconduct against police officers and it recommended extensive "cultural change" in the force.
"The implementation of the police response is at a critical point," Deputy Auditor-General Phillippa Smith said in the monitoring report.
"Without more concerted effort now there is a risk that progress will stall, the achievements of the police's change programme to date will dissipate and the benefits of change will not be realised."
Mr Broad said the report acknowledged the considerable progress which had been made, including the completion of seven of the inquiry's 47 recommendations.
"We are making good progress thanks to the commitment which has already been demonstrated by staff but we acknowledge that we are at a critical point in terms of implementation," he said.
"We accept that we need constant commitment and visibility among all police staff to ensure cultural changes become firmly established."