But Wellington International Airport has fallen foul of the Employment Relations Authority for using a private investigator to install cameras to spy on the sexual activities of a manager before the law was changed.
The airport recordings caught duty manager Dieter Ravnjak engaged in "sexual activity" with a woman in an emergency management room and he was dismissed for serious misconduct.
The cameras were installed by private investigator Cedric Hardiman, who also managed the airport's taxi and parking facilities.
At the time, the Private Investigators and Security Guards Act prohibited investigators from making recordings without the consent of the person recorded – in effect banning secret recordings. (more)