Police say an officer's son was not part of a core group of teenagers who have been boasting online about sex with intoxicated and underage girls.
Police have been monitoring the Auckland group of 17- and 18-year-olds who called themselves Roast Busters since 2011, but say they do not have enough evidence to pursue charges unless one of the girls makes a complaint.
Waitemata district commander Superintendent Bill Searle said on Tuesday that an officer's son was a member of the group but did not take part in any of the sexual activity.
Mr Searle says the police investigation has not been affected by the family relationship.
Police have brought in a senior detective from outside Auckland to help with the case.
