Taxi cameras were made mandatory in August 2011, after the murder of Auckland taxi driver Hiren Mohini the previous year.
Prior to their introduction, allegations of assaults in cabs - by the driver or a passenger - were often difficult to prove. Because there was rarely an independent witness, such cases came down to he said/she said.
One stark example was an assault allegation revealed by the Herald on Sunday in 2009.
Air hostesses Rebeka Raiwalui and Alexis Hickman-Green claimed cabbie Zulfiqar Khan had hit one of them in the face and grabbed the other by the throat.
The 31-year-old driver, who also worked as a part-time model and personal trainer, denied assaulting the women at the taxi rank by Auckland's SkyCity casino.