Police Commissioner Peter Marshall says police cannot afford to fail victims of sexual assault and has warned his staff if they do the public "will not forgive us".
In further public comments about the Roast Busters controversy, Mr Marshall said the public's anger would not be a surprise given the importance of investigations into sexual abuse.
"No matter how well we do elsewhere, we're rightly always going to be criticised if we fail in such a sensitive and important area.
"It is quite proper that the public expects us to deal with these matters with empathy, timeliness, accuracy and rigour as we seek to establish the truth."
Roast Busters is the group of Auckland teenage boys who boasted online about stupefying girls and then having sex with them.